Multi-mode Data Controller User Guide

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MFJ-1278B MULTI-MODE TABLE OF CONTENTS

Table of Contents

INTRODUCTION......................................................................................................... 1

COMPUTER INTERFACING...................................................................................... 4

MFJ Starter Packs .................................................................................................. 4

Computer Interface with MFJ Starter Pack............................................................ 5

Computer Interface without MFJ Starter Pack....................................................... 5

SERIAL PORT SIGNALS............................................................................................ 5

COMPUTER WITH SPECIFIC SERIAL INTERFACES............................................ 6

Apple Macintosh.................................................................................................... 6

Commodore C64, C128 and VIC-20...................................................................... 7

IBM PCjr................................................................................................................ 7

Radio Shack Color Computer ................................................................................ 8

Color Computers.................................................................................................... 8

IBM PC/XT/AT/386/486 and compatibles Computer ........................................... 8

Other Computers with Nonstandard Serial Ports.................................................... 9

TERMINAL SOFTWARE REQUIREMENTS ............................................................ 10

Apple Macintosh.................................................................................................... 10

Apple II, II+, IIe, IIc .............................................................................................. 10

Commodore C64, C128 and VIC-20...................................................................... 11

IBM PCjr................................................................................................................ 11

IBM and Compatible Computers ........................................................................... 11

Radio Shack Color Computer ................................................................................ 12

Radio Shack Model 100/102 and NEC 8201 ......................................................... 12

MFJ-1278B SERIAL PORT PIN FUNCTIONS........................................................... 12

COMPUTER BAUD RATE ......................................................................................... 13

Autobaud................................................................................................................ 13

Changing Terminal Baud Rate............................................................................... 14

VERIFYING SERIAL PORT OPERATION................................................................ 15

PARALLEL PRINTER PORT...................................................................................... 16

Printer Port Connection.......................................................................................... 16

Printer Consideration ............................................................................................. 17

Printer Port Test..................................................................................................... 17

RADIO INTERFACING............................................................................................... 18

MFJ-1278B Radio Ports ........................................................................................ 18

RADIO PORTS CONNECTION.................................................................................. 19

HANDHELD RADIO CONNECTION ........................................................................ 20

RADIO INTERFACING METHODS .......................................................................... 21

Method 1: Direct Connection to Microphone and Speaker.................................... 21

Transmit Audio Level Adjustment for Method I Interface ............................... 21

Setting the Receiver Audio Input Level

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Summary of content (406 pages)

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MFJ-1278B MULTI-MODE TABLE OF CONTENTS Table of Contents INTRODUCTION......................................................................................................... 1 COMPUTER INTERFACING...................................................................................... 4 MFJ Starter Packs .................................................................................................. 4 Computer Interface with MFJ Starter Pack ............................................................
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MFJ-1278B MULTI-MODE TABLE OF CONTENTS FSK CONNECTION..................................................................................................... 29 GETTING STARTED .................................................................................................. 30 First Steps............................................................................................................... 30 Basic Commands .............................................................................................
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MFJ-1278B MULTI-MODE TABLE OF CONTENTS CONNECT............................................................................................................. 56 SPEEDup/SPEEDdown ......................................................................................... 56 AUTOMATIC ON-LINE COMPRESSION.......................................................... 56 FLOW CONTROL................................................................................................. 56 AMTOR while in PACTOR mode .........
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MFJ-1278B MULTI-MODE TABLE OF CONTENTS Summary of AMTOR Contact Sequence ............................................................... 90 NAVTEX OPERATION............................................................................................... 91 Navtex Stations and Frequencies ........................................................................... 91 Navtex Operation ................................................................................................... 91 FAX OPERATION ..........
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MFJ-1278B MULTI-MODE TABLE OF CONTENTS Packet Timing................................................................................................... 125 Radio Baud Rate............................................................................................... 126 Special Protocol Timing ................................................................................... 127 Monitor Functions..................................................................................................
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MFJ-1278B MULTI-MODE TABLE OF CONTENTS Link Status Messages ............................................................................................. 302 MFJ-1278B SPECIFICATIONS................................................................................... 305 GENERAL DESCRIPTION ......................................................................................... 306 DETAILED CIRCUIT DESCRIPTION ....................................................................... 307 Oscillator...........
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MFJ-1278B MULTI-MODE TABLE OF CONTENTS Comprehensive Alignment Procedure.................................................................... 340 Set Modulator Tones Using Built-in Calibration Software............................... 340 Demodulator Center Frequency Alignment ...................................................... 341 Tuning Indicator Alignment ................................................................................... 342 CW MODEM TUNE-UP PROCEDURE ..................................
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MFJ-1278B MULTI-MODE TABLE OF CONTENTS
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MFJ-1278B MULTI-MODE INTRODUCTION INTRODUCTION Welcome to the exciting world of Amateur Digital Communications. By choosing the MFJ1278B, you have chosen the most versatile and powerful Multi-mode Data Controller manufactured for the Amateur Radio Service. The MFJ-1278B interfaces your radio with any personal computer that has an RS-232 or TTL level Serial Port and a terminal program.
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MFJ-1278B MULTI-MODE INTRODUCTION The new "packet collision prevention" features -- Prioritized Acknowledgments and Slottime are installed. This new technology helps prevent many packet collisions inherent in the current packet protocol. The EPROM containing the MFJ-1278B firmware, previously 512K bits, has been expanded to 1 Megabits giving the MFJ-1278B twice the room to grow in. You also get a Key Paddle input jack so you can use your MFJ-1278B as an Iambic Keyer or Memory Keyer.
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MFJ-1278B MULTI-MODE INTRODUCTION Items supplied with MFJ-1278B/MFJ-1278BT package 1. One MFJ-1278B or MFJ-1278BT Multi-Mode Data Controller 2. One AC adapter power supply for 110V AC. 240V AC adapter supplied for MFJ1278BX (export model for country which operate on 220-240V AC). 3. Two open end radio port cables with 5-pin DIN male connectors. 4. One 10-pin connector for the TTL port. 5. One MFJ-1278B Instruction Manual. 6. One MFJ-1278B Fast-Start Manual.
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MFJ-1278B MULTI-MODE COMPUTER INTERFACING COMPUTER INTERFACING You are now ready to connect your MFJ-1278B to your station's computer or terminal. Throughout this manual we will use the term "computer" to refer to the computer or terminal you use to communicate with your MFJ-1278B. The MFJ-1278B communicates with your computer through a serial port, using signals corresponding to a standard called RS-232C.
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MFJ-1278B MULTI-MODE COMPUTER INTERFACING Computer Interface with MFJ Starter Pack If you are using one of the MFJ Starter Packs, you should use the cable provided to connect the MFJ-1278B to your computer. Follow the instruction manual provided with the Starter Pack to operate the terminal program and to connect the MFJ-1278B to your computer. When finished with installation of the MFJ-1278B proceed to the "Computer Baud Rate", for further information about TNC installation.
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MFJ-1278B MULTI-MODE COMPUTER INTERFACING Many computers require a serial port adapter card. These cards incorporate the circuitry necessary to add an RS-232C port to the computer. Some popular models in this category are the Apple II series, the IBM Personal Computer, many Radio Shack computers, and the Sanyo MBC-55X series. If you have one of these computers with an "add-in" serial port, or if you have another computer we haven't mentioned, you should skip to one of the sections on "other computers.
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MFJ-1278B MULTI-MODE COMPUTER INTERFACING Commodore C64, C128 and VIC-20 The MFJ-1278B has a built-in TTL-level port for interfacing with the Commodore C64, C128 or the VIC-20 computers. You do not need a RS-232C converter to interface with the MFJ-1278B. An optional Starter Pack for the C-64, C-128 or the VIC-20 is available from MFJ Enterprises, Inc. or any dealer of MFJ products. The Starter Pack includes a cable from the MFJ-1278B TTL port to the user I/O port on the Commodore computer.
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MFJ-1278B MULTI-MODE COMPUTER INTERFACING Radio Shack Color Computer The Color Computer series (except for the Micro Color Computer) uses a 4-pin DIN-style connector for its serial port. If you wish to construct your own cable, the information in Figure 2-2 will be helpful. All necessary parts should be available from Radio Shack dealers. Color Computer 4 2 3 DB-25P 2 3 7 Fig. 2-2.
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MFJ-1278B MULTI-MODE COMPUTER INTERFACING If your computer is configured as DCE, you will have to wire pin 2 of your MFJ-1278B to pin 3 of the computer RS-232C connector. Then wire pin 2 of the computer's RS-232C connector to pin 3 of your MFJ-1278B. Please note that pin 7 of the computer's RS-232C connector will still connect to pin 7 of your MFJ-1278B serial port. Some computers may require that pin 5 of the computer serial port connector be connected.
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MFJ-1278B MULTI-MODE COMPUTER INTERFACING TERMINAL SOFTWARE REQUIREMENTS Any software package that enables your computer to act as an ASCII terminal with an ordinary telephone modem should work with your MFJ-1278B. If you have a program that you have used successfully with a telephone modem and that you are familiar with, use that program to communicate with your MFJ-1278B. If you are using a terminal program provided by the MFJ Starter Pack, proceed to the "Computer Baud Rate" section in this chapter.
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MFJ-1278B MULTI-MODE COMPUTER INTERFACING Commodore C64, C128 and VIC-20 The optional Starter Pack for the C-64, C-128 and VIC-20 is available from MFJ Enterprises, Inc. or from any dealer of MFJ products. Included in the Starter Pack is a cable to connect the MFJ-1278B TTL port to the user I/O port on the Commodore computer. Also included with the Starter Pack is a terminal program. The terminal program allows compatibility between the MFJ-1278B and the Commodore computer.
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MFJ-1278B MULTI-MODE COMPUTER INTERFACING Radio Shack Color Computer There are several terminal programs available for the Color Computer. You will probably want to use a commercial program (rather than writing your own) since the Color Computer has a "software UART" that is difficult to program in BASIC. Some of the terminal programs available are COLORCOM 64, AUTOTERM and RICKEYTERM (for Coco III). Others are WIZ and XTERM for OS-9.
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MFJ-1278B MULTI-MODE COMPUTER INTERFACING Pin 3 Receive Data The Receive Data pin is an output line from the MFJ-1278B on which the attached device receives data. The attached device is generally a computer or data terminal. Pin 4 Request To Send The Request To Send pin is an input line to the MFJ-1278B on which the attached device requests clearance to transmit data to the MFJ-1278B.
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MFJ-1278B MULTI-MODE COMPUTER INTERFACING time the MFJ-1278B signs on you will not need to press the return key to execute the Autobaud routine. In setting AUTOBAUD to OFF, you should remember that if you change the terminal program baud rate is changed, then MFJ-1278B will no longer be able to match the new baud rate. You must change the baud rate of your terminal program to match the baud rate you set for the MFJ-1278B or you may remove JMP 5 on the MFJ-1278B board to reset the battery back-up RAM.
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MFJ-1278B MULTI-MODE COMPUTER INTERFACING VERIFYING SERIAL PORT OPERATION Now that you have a terminal program and the connecting cable for attaching the MFJ-1278B to your computer, you are ready to verify that the MFJ-1278B will communicate with your computer. 1. Turn on your computer. Load and run the terminal program. 2. Set the parameter of the terminal program as follow: Word Length Duplex Parity Stop Bits Baud Rate 8 bits Full None 1 300, 1200, 2400, 4800, 9600, or 19,200 3.
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MFJ-1278B MULTI-MODE COMPUTER INTERFACING The MFJ-1278B has a parallel printer port in which to attach a parallel printer. The parallel printer port is located on the left-hand side of the MFJ-1278B. The printer port can be used to make hard copies of either text or graphics. Printer Port Connection The printer port is configured as a Centronics compatible parallel port. A cable with male DB-25 on one end and a 36 pin Centronics male connector for the printer end should be used.
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MFJ-1278B MULTI-MODE COMPUTER INTERFACING Printer Consideration The MFJ-1278B printer port will work with any printer that is compatible with EPSON or IBM graphics. Printers that are not EPSON or IBM graphics compatible can not be used to print FAX or SSTV pictures. In addition to being able to print such as weather FAX, FAX and SSTV pictures, the printer connected to the MFJ-1278B printer port can also print incoming text in all modes as it is received on the screen.
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MFJ-1278B MULTI-MODE RADIO INTERFACING RADIO INTERFACING Computer interfacing, covered in the previous chapter, is only half the interfacing task. The other half is connecting your MFJ-1278B to your radios. MFJ-1278B Radio Ports Interfacing the MFJ-1278B to your radios involves connecting the following signals at Radio Port 1 and Radio Port 2. The pin outs of Radio Port 1 and Radio Port 2 are shown in Fig. 3-1. Pin1 Microphone audio, from the MFJ-1278B to your transmitter.
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MFJ-1278B MULTI-MODE RADIO INTERFACING RADIO PORTS CONNECTION The MFJ-1278B gives the user two (2) radio ports. This allows for both FM and HF operation from either radio port. Since the radio ports are independent of each other, the user is not restricted to FM or HF operations. The radio ports on the MFJ-1278B allow an FM radio and an HF radio to be connected at all times. In fact you can have any combination of HF radios or VHF radios connected to the radio ports at any time.
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MFJ-1278B MULTI-MODE RADIO INTERFACING HANDHELD RADIO CONNECTION Some HTs key the transmitter by drawing a small amount of current from the microphone input pin (see Fig. 3-3 below). Radios with this type of special keying circuit are ICOM-2AT (tm) and Yaesu FT-x09, FT-x3, FT-727 (tm) and others. Appendix A at the end of this instruction manual provided pin designation for some of the radios. Also consult the instruction manual of your radio.
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MFJ-1278B MULTI-MODE RADIO INTERFACING RADIO INTERFACING METHODS The MFJ-1278B allows radio connection without any modifications to the radio or any signal balancing devices in the cables. There are two types interfacing methods presented in this chapter. Method 1: Direct Connection to Microphone and Speaker For Method 1, shown in Fig. 3-5, the MFJ-1278B's audio is fed directly into the microphone connector or similarly connected auxiliary jack.
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MFJ-1278B MULTI-MODE RADIO INTERFACING 3. With the MFJ-1278B keying the transmitter and transmitting the higher of the two tones, adjust the transmit audio level as follows. With a small flat-tipped screwdriver, adjust trimpot located on the left side of them MFJ-1278B (R157 for radio 1 or R158 for radio 2) while you listen to the monitoring receiver. Adjusting the trimpot CW increases the output, while CCW decreases the output.
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MFJ-1278B MULTI-MODE RADIO INTERFACING The bandwidth of the receiver audio will have an effect on modem sensitivity to false DCD. Some receivers produce wideband audio that will NOT produce any false DCD activity regardless of the threshold control setting. In this case, set the DCD threshold control to its maximum clockwise rotation. This will not effect modem performance.
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MFJ-1278B MULTI-MODE RADIO INTERFACING Fig. 3-7 External Interface Box If you built the external interface box as in Fig.3-7, then follow this procedure to adjust R(s). 1. Install JMP J on the MFJ-1278B PC board. 2. Temporarily solder a variable resistor in place of R(s) Fig. 3-7. The maximum value of this resistor can be determined by experiment. However, a 500K resistor should be adequate most cases. Connect your MFJ-1278B to the radio.
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MFJ-1278B MULTI-MODE RADIO INTERFACING Transmit Audio Level Adjustment for Interface Method II 1. Turn on the MFJ-1278B and computer and start your terminal program. Enter the modem calibration procedure by typing CALIBRA Press the K key to key the transmitter, then tap the space bar until the higher of the two tones is heard. Pressing the K key again will unkey the transmitter. After the transmitter has been keyed for a few seconds, it will shut off automatically by the transmit watch-dog circuit.
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MFJ-1278B MULTI-MODE RADIO INTERFACING Receiver Audio Setting The modem in your MFJ-1278B is equipped with an advanced phase coherence type data carrier detection (DCD). A threshold control and a sensitive tuning indicator is also provided. Together these can be used to set the correct receive audio level for the modem. These can also be used to optimize the DCD characteristics for the various methods of operation.
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MFJ-1278B MULTI-MODE RADIO INTERFACING MONITOR SPEAKER CONNECTION The MFJ-1278B has a built audio amplifier to provide audio for an external monitor speaker. A Monitor speaker such as the MFJ-280, can be can be connected to the SPEAKER jack on the MFJ-1278B. The MFJ-1278B requires only one speaker for RADIO 1 and RADIO 2. The MFJ-1278B will automatically switch the monitor speaker to the radio port in use. If wiring of a speaker plug is necessary, use a 3.
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MFJ-1278B MULTI-MODE RADIO INTERFACING CW INSTALLATION The MFJ-1278B user can send and receive CW by using your computer keyboard. However, the MFJ-1278B expands CW operating fun by allowing you to connect an iambic paddle to the KEY input jack of the MFJ-1278B. This feature allows you to use the MFJ-1278B as a CW memory keyer. So now the user can operate CW from either the computer or an iambic paddle.
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MFJ-1278B MULTI-MODE RADIO INTERFACING FSK CONNECTION If your HF radio permits FSK operation, an FSK output is provided. The FSK output is at pin 8 of the TTL port on the rear panel of the MFJ-1278B. Only two lines (Pin-8 FSK and Pin- 3 ground) are needed in making the FSK connection to your radio. Use the 8-pin IDC connector supplied with your MFJ-1278B to make the FSK cable. See Figure 3-9 below. Figure 3-9 FSK Cable Note: The factory setting of the FSK signal polarity is normal on the MFJ-1278B.
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MFJ-1278B MULTI-MODE BASIC OPERATION GETTING STARTED This chapter will guide you through the basic operation on all the modes that the MFJ-1278B is capable of performing. It contains the basic information required to operate PACKET, PACTOR, RTTY, ASCII, CW, AMTOR, NAVTEX, FAX, SSTV and CW Memory Keyer. Note: In this section you will see this symbolism, . This means to press the Carriage Return or Enter key on your keyboard. First Steps 1.
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MFJ-1278B MULTI-MODE BASIC OPERATION followed by a carriage return. Now let's try entering your callsign using one of the basic commands, MYCALL, by typing from the cmd command prompt: MYCALL K5FLU followed by a carriage return. The MFJ-1278B will respond with: MYCALL was NOCALL cmd: followed by the the system command mode prompt, cmd:. Of course, you should substitute your own call sign for K5FLU. Do not forget the at the end of the line.
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MFJ-1278B MULTI-MODE BASIC OPERATION Parity and Word Length If you are using one of the optional MFJ Starter Packs, then you should follow the instructions given by the terminal program documentation with the starter pack. If you are not using one of the MFJ starter packs, then you should use the following instructions to set the parity and word length for the MFJ-1278B.
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MFJ-1278B MULTI-MODE BASIC OPERATION New Lines and Line Wrapping If everything displayed appears to be double-spaced, your computer is adding an extra linefeed () whenever it displays a carriage return (). Set AUTOLF OFF to keep the MFJ-1278B from also adding an . If you change equipment you may have to set AUTOLF ON to restore the MFJ-1278B's automatic linefeeds. The screen-width parameter is set by default to 80, the width of many CRT displays.
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MFJ-1278B MULTI-MODE BASIC OPERATION THE MFJ-1278B MULTI-MODE MODEM The MFJ-1278B modem has five sets of pre-set modem components. These modem components allow the MFJ-1278B to operate efficiently in its various modes of operation. These modes of operation include VHF and HF Packet, PACTOR, AMTOR, VHF RTTY, HF RTTY, VHF ASCII, HF ASCII, CW, Modulated CW, CW Memory Keyer, 16 gray level FAX (including Weather FAX), color SSTV and monitoring of NAVTEX.
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MFJ-1278B MULTI-MODE BASIC OPERATION OPERATIONAL MODES Verifying Operation Status Upon initial power up, the MFJ-1278B defaults to VHF Packet mode. The radio baud rate defaults to 1200 baud. Radio port 1 is the default radio connection. You can verify the operating status of the MFJ-1278B at any time by using the command MODE after the display of the CMD: prompt. To check operation mode, type: MODE The MFJ-1278B will respond with modem status display lines followed with the cmd: prompt.
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MFJ-1278B MULTI-MODE BASIC OPERATION On the CW, MCW and Memory Keyer operation modes, instead of selecting a baud rate you will select CW sending speed by entering a number from 5 thru 99. If you do not select a speed, the MFJ-1278B will use the last speed selected. The default value is 20 WPM. MODE CODE VP HP PT VB HB VA HA AM CW MC FX TV OPERATION MODE VHF Packet HF Packet Pactor VHF Baudot RTTY HF Baudot RTTY VHF ASCII RTTY HF ASCII RTTY AMTOR/NAVTEX CW/ Mem.
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MFJ-1278B MULTI-MODE BASIC OPERATION Loading the Memory Buffers The ten memory buffers are empty when the MFJ-1278B is first initialized. To load the memory buffers the user can invoke the BUF command. To load the memory buffers, please note the example below for loading buffer 1. The MFJ1278B must be in COMMAND mode: BUF1 The QTH here is Starkville, Mississippi. Where 1 is the memory buffer number, that can range from 0 thru 9. "The QTH here is Starkville, Mississippi," is the buffer message.
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MFJ-1278B MULTI-MODE BASIC OPERATION Memory Repeat and Buffer Repeat Time Of the ten memory buffers provided by the MFJ-1278B, memory buffer 0 has a repeat function. The user can enable the repeat function, moreover specify a time interval. The BUFTIME specifies the time interval between repeats of memory buffer 0. Values from 0 to 65,535 are suitable for the BUFTIME command. The increments of the BUFTIME are in seconds.
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MFJ-1278B MULTI-MODE BASIC OPERATION Note: If BUFTIME is a non-zero value, MFJ-1278B will automatically release the PTT line and revert to the receive mode between repeats. This allows you to monitor the frequency for any replies to your message. If the MFJ-1278B is not interrupted during the pre-set delay time, it will continually repeat until buffer 0 is interrupted. TUNING INDICATOR Your MFJ-1278B comes equipped with a very accurate and sensitive tuning indicator.
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MFJ-1278B MULTI-MODE BASIC OPERATION PACKET OPERATION VHF Packet If you are not familiar with packet operation, then you can learn quite a bit about it with the MFJ-1278B without transmitting anything. For your first experiments, the MFJ-1278B will be "talking to itself," allowing you to become familiar with it before you go on the air. If you are already familiar with the packet operation, then you may not want to perform this exercise. In this case go the other modes of operation in this chapter.
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MFJ-1278B MULTI-MODE BASIC OPERATION The causes your message to be put into a packet, or "packetized," and transmitted. (We explain in the next chapter how you can use a different character to send packets.) The underlined text is a message that the MFJ-1278B received in a packet and displayed. Whenever you are in Converse Mode anything you type will be assembled into a packet addressed to the station you are talking to and transmitted.
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MFJ-1278B MULTI-MODE BASIC OPERATION Be sure to remove the jumper from JMP10 after you complete this "Connecting and Disconnecting Exercise". Digipeating You may wish to have a QSO with another packet station that is beyond your direct radio range. If a third packet station is on the air and both you and the station you want to talk to are in range of this third station, that station can relay your packets. You set up the packet routing when you initiate the connection.
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MFJ-1278B MULTI-MODE BASIC OPERATION Unsuccessful Connections Sometimes you will initiate a connect sequence that can't be completed. The station may not be on the air, or it may not be within range of your station. You may have even mis- typed the other call sign. If the MFJ-1278B does not get a response to its first connect packet, it will try again. You can control the number of attempts the MFJ-1278B will make with the command RETRY. The default number of retry attempts is 10.
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MFJ-1278B MULTI-MODE BASIC OPERATION Since you are not connected to another station your packets are sent to the address "CQ," i.e., anyone. The packet you sent was "heard" by the MFJ-1278B and displayed, along with the sending station and the destination. If you also want to see any intermediate digipeater stations being used, you can set MRPT ON. This feature would be useful if you later want to connect to one of the stations you are monitoring and will need a digipeater route in order to reach it.
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MFJ-1278B MULTI-MODE BASIC OPERATION Your First Packet QSO Although there are still a number of features you should be familiar with, you are probably eager to get on-the-air and try out your new MFJ-1278B. Arrange to have another packet operator get on the air to help you get started. Make sure that your friend will be close enough to ensure solid copy, with no FM "popcorn" noise. It's best if you can get an experienced packet operator to help you get started.
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MFJ-1278B MULTI-MODE BASIC OPERATION Exchange several messages to get a feel for this new mode. If you monitor the radio transmit indicators and listen to the speaker audio from the two rigs, you will have a better idea of what is happening. Your radio will be inactive most of the time, even while you are actually typing. When you come to the end of a line while typing, press the to send the data to the MFJ-1278B. The MFJ-1278B will key the radio briefly, after it receives the data you typed.
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MFJ-1278B MULTI-MODE BASIC OPERATION Monitoring on the Air This is a good time to try out the MFJ-1278B's monitor functions. While you and your friend are separately connected, type cmd: MONITOR ON cmd: MCON ON cmd: CONVERS You will be able to see both your "conversation" and your friend's conversation. Also try HEADERLN ON and MHEARD. Special Input Characters The MFJ-1278B has a number of special characters that can be used to control its actions.
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MFJ-1278B MULTI-MODE BASIC OPERATION If you make several mistakes in a line, or if you change your mind, you may want to cancel the whole line rather than rubbing out the characters one at a time. You can cancel the line by typing . The MFJ-1278B will display a followed by a . If you are in Command Mode, you will see a new prompt: cmd: Hi, John, how are you?\ [You started typing text while in Command Mode.
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MFJ-1278B MULTI-MODE BASIC OPERATION BASIC HF PACKET OPERATION The requirements for optimum performance with a typical HF or OSCAR 10 path are very different compared to local VHF FM environment. Lower signal to noise ratios require lower baud rates, noise spikes and fades require shorter packet lengths, and a higher rate of false carrier detects lowers the total usable dynamic range in the audio input. The MFJ-1278B hardware and software improves throughput in the noisy and fading HF environment.
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MFJ-1278B MULTI-MODE BASIC OPERATION If you cannot contact anyone using another frequency, call CQ on one of the above mentioned frequencies. If you do make a contact with someone, then QSY immediately after establishing contact! Be careful on 20 meters especially that you don't operate +/2KHz around 14.100 MHz (you will cause interference to propagation beacons and give packet a bad name...). HF Packet Operation Hints There are a few operating hints which apply to HF Packet.
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MFJ-1278B MULTI-MODE BASIC OPERATION PACTOR In this section of this manual we will talk about PACTOR operation. We will cover basic operation along with an explanation of the commands related to PACTOR, including the new Pactor Mailbox. Before we talk about Basic Operation, let's explain a little about PACTOR. NOTE: Pactor operations apply to the Model MFJ-1278B or MFJ-1278 TNC2 only. The MFJ-1278 must have the MFJ-56A, B, or C installed to take advantage of the Pactor option.
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MFJ-1278B MULTI-MODE BASIC OPERATION Now that we have the MFJ-1278B signed-on to the computer, let's put it into the PACTOR mode. To put the MFJ-1278B into PACTOR mode, please type the following: MODE PT The MFJ-1278B will respond with: [MFJ PACTOR $2c-1022 free] p_cmd: At the above prompt, you are in the PACTOR mode. Any commands entered such as TXDELAY or ECHO, will only affect the PACTOR mode.
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MFJ-1278B MULTI-MODE BASIC OPERATION PACTOR ARQ For ARQ operation you will need to know the other person's callsign. Normally you can get the other person's call by monitoring the channel for connect requests or other ARQ contacts. To establish contact with another station, you must be at the p_cmd: prompt. To initiate a connect sequence, please type the following: C n where n is the CALLSIGN of the station you want to connect with. The callsign is not to be over eight characters in length.
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MFJ-1278B MULTI-MODE BASIC OPERATION information how the CON and STA leds react to incoming signals please refer to the chart on Page 30 of this chapter.. Monitoring AMTOR ARQ requests AMTOR ARQ requests monitored while the MFJ-1278B in PACTOR mode. If the controller detects your selcall in an AMTOR ARQ request packet, the controller will switch to AMTOR and try to establish the link. This feature allows someone who doesn't have PACTOR capability to connect to you in AMTOR mode.
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MFJ-1278B MULTI-MODE BASIC OPERATION As indicated in the preceding paragraph, the usual terminal/radio/modem parms are available. As in Packet, Pactor also contains COMMAND and CONVERSE modes. Please note that switching between them is modeled on the "NEWMODE ON" procedures in packet. The MFJ1278B is in COMMAND mode, if the p_cmd: prompt is on the computer screen. To switch to CONVERSE mode from COMMAND mode the K key followed by an is issued by the user.
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MFJ-1278B MULTI-MODE BASIC OPERATION To prevent Uncontrolled Disconnects, we are unable to listen to all kinds of third party Pactor transmissions for (WAIT x Cycle_Time) seconds after receiving the other side's last disconnect. This includes all unproto and connected packets, along with connect requests. The actual cycle time is 1.25 or 1.4 seconds.
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MFJ-1278B MULTI-MODE BASIC OPERATION AMTOR selective callsign in the "a_cmd:" MYSELCAL parameter. Furthermore, you must have the appropriate sideband, usually, LSB selected because unlike PACTOR, AMTOR is polarity dependent. Amtor Detection in Pactor The MFJ-1278B's Pactor continuously monitors the channel for Pactor packets, and for AMTOR call packets that match your AMTOR SELCALL. When PACTOR hears your AMTOR SELCALL, the TNC enters the "a_cmd:" AMTOR mode in an attempt to complete the link.
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MFJ-1278B MULTI-MODE BASIC OPERATION PACTOR MAILBOX The MFJ-1278B now includes a new feature called a PACTOR MAILBOX. In this section we will cover basic operation of the new Pactor Mailbox, and the operative commands. The Pactor Mailbox includes the basic commands of the Packet mailbox. The Pactor Mailbox is very simple and easy to use. Any amateur radio operator who has Pactor capability can access your Pactor Mailbox, after establishing the initial connection to your station.
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MFJ-1278B MULTI-MODE 1. BASIC OPERATION From the cmd: prompt please type the following: MODE PT the MFJ-1278B will respond with: [MFJ PACTOR $2c-1022 free] followed by the p_cmd: prompt on the next line. The $2c is the checksum of MFJ's Pactor release. You will probably notice a slight delay in obtaining the p_cmd: prompt. This is because the MFJ-1278B is figuring up the Pactor checksum, this is perfectly normal. 2.
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MFJ-1278B MULTI-MODE BASIC OPERATION The MFJ-1278B will respond with the standard cmd: prompt. From the cmd: prompt type: SYSOP Your MFJ-1278B will respond with: |K[MFJ-2.1-IH$] Mailbox ready n free Mailbox (B, E, H(elp), J, K, L,M, R, S, T)> You are now in the Packet mailbox, as the SYSOP. All of the above command are available to you as the SYSop. Please refer to the Easy-Mail™ mailbox section in Chapter 5 of this manual, for further information on the above command.
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MFJ-1278B MULTI-MODE BASIC OPERATION Kill Allows the remote user to kill messages that are addressed specifically to the user. If the message is not addressed to the user, then the mailbox will respond with "not yours", and present the user with the mailbox prompt. Kill ## Allows the remote user kill a message in a particular slot, nn. Slot nn is a particular slot number from 1 to 99. Remote users may only kill messages that are addressed only to them or originated by them.
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MFJ-1278B MULTI-MODE BASIC OPERATION If the above conditions are met then all the remote user must type: K , followed by a changeover characters, CTRL-Y. This will go out to Mailbox, then the messages with the message flags set to Y with all of the proper callsigns will be killed. The Mailbox will respond back to the remote user with all message numbers killed during the Global Kill process. Also the Mailbox prompt will be given again.
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MFJ-1278B MULTI-MODE BASIC OPERATION Read This command lets you read messages addressed to you. When you list the messages in the mailbox you notice an N flag next to the messages which you have not read. Once you read those messages the N flag will change to a Y flag. This is an indicator to both you and the SYSOP that the messages have been read. From there you can perform a global kill on all of your messages or the SYSOP can kill them individually.
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MFJ-1278B MULTI-MODE BASIC OPERATION 1. First a remote must establish a connection to your Mailbox, via your Pactor callsign. 2. If your Pactor Mailbox is ON, then it will answer back with the Pactor Mailbox prompt: Mailbox Ready n free de callsign (H(elp), K, L, R, S)> The n free is the amount of RAM space available for messages. The n will be no higher than 65K, if a 512K or a 128K Mailbox is in operation. If the Mailbox is 32K then nn will be 32K.
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MFJ-1278B MULTI-MODE 4. BASIC OPERATION There are two (2) different ways the remote user can kill messages. The first is give in the example below: a. To kill a message in a particular slot, the remote user would type: K## Where the ## is the message number the remote user wants to kill. The Pactor Mailbox will respond with: Message ## deleted; nn free {n} Mailbox (H(elp),K, L, R, S)> This is whether or not the message flag is set to an N or a Y.
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MFJ-1278B MULTI-MODE BASIC OPERATION The Mailbox will respond with a list of currently used slots in the following format: Slot:## t m To: From: Subject: Where Slot## column is the number of the slot that the messages are in. The number of message slots present in the standard 32K Mailbox is 99. The lower case t is the Type Flag block. The lower case m is the Message Flag block. The To: column will contain the callsign of the person who the message is addressed to.
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MFJ-1278B MULTI-MODE BASIC OPERATION is proper Pactor etiquette. If you access your Mailbox via the SYsop command, then you must issue a CTRL-C to exit the Mailbox and return to command mode. The SYSOP mode is accessed through the Packet mailbox, as mentioned earlier in this section. The command prompt will indicate the stream you are on. The command prompt may look like this: |Acmd: where |A indicates that you are on packet stream A.
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MFJ-1278B MULTI-MODE BASIC OPERATION CW OPERATION The MFJ-1278B provides many unique features in the CW mode that are not found in other multi-mode controllers. The MFJ-1278B can key your CW transceiver in the CW mode of operation. The MFJ1278B can accommodate either positive (direct) or negative (grid block) keying voltages. The MFJ-1278B also has a code practice mode built-in, that can be used with VHF FM radios in the Modulated CW (MCW) mode.
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MFJ-1278B MULTI-MODE BASIC OPERATION Receiving CW The MFJ-1278B receives international Morse Code from 1 to 99 WPM. Reception of alphabetic and numeric characters, including the puncuations and prosigns listed in Table 44. From command mode, put the MFJ-1278B in the CW Mode by typing: MODE CW,xx , where "xx" is the CW transmit speed. The MFJ-1278B will respond with the mode status lines, and end with the command prompt.
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MFJ-1278B MULTI-MODE BASIC OPERATION If the AUTOTRAC command is OFF, then before the MFJ-1278B can copy the tuned-in CW signal, it must be manually locked to the speed of the received signal. To manually lock the MFJ-1278B to the incoming signal, type a CTRL-U. The MFJ-1278B will respond with "locking...". The MFJ-1278B will analyze the incoming CW signal. When the analysis of the incoming CW signal is complete, the MFJ-1278B will respond with "Locking...xxwpm.
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MFJ-1278B MULTI-MODE BASIC OPERATION If CWSEndch is left at the default setting of 255 or $FF, the MFJ-1278B will transmit all characters immediately when typed. The requirement for pressing the is eliminated. Note: If you are using a terminal program such as "PROCOMM" for IBM PC and compatibles that buffers the transmit data, then a CARRIAGE-RETURN will be needed to transmit. The MFJ-1278B employs full CW break-in for transmitting in the CW/MCW modes.
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MFJ-1278B MULTI-MODE BASIC OPERATION Tuning your Radio The MFJ-1278B lets you tune your radio with the TUNE command. The TUNE command is issued from the command mode. The user can use the TUNE command in any of the MFJ1278B operating modes. The TUNE command activates the PTT line for 30 seconds. After 30 seconds MFJ-1278B will automatically return to command mode. To abort tuning before 30 seconds, press any key on the keyboard.
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MFJ-1278B MULTI-MODE BASIC OPERATION Setting Up the for Code Practice You can monitor the random code sent by the MFJ-1278B without a radio connected. In order to monitor the random code, attach a small speaker to the "SPEAKER" jack, located on the back panel of the MFJ-1278B Note: If a radio is connected and you do not wish to transmit the random code, the radio should be turned OFF. The MFJ-1278B will key PTT line and the keying output is active while RANDOMCW is ON.
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MFJ-1278B MULTI-MODE BASIC OPERATION CW CONTEST MEMORY KEYER OPERATION For CW enthusiasts who like to use a key paddle to send CW, the MFJ-1278B provides an input for an iambic key paddle. See CW KEY PADDLE INSTALLATION in chapter 3 in this MFJ-1278B manual for installation of your iambic key paddle. Sending CW with External Key Paddle The MFJ-1278B sends key paddle generated CW at 5 to 99 WPM. The transmission speed for key paddle CW defaults to the same speed as keyboard CW, 20 WPM.
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MFJ-1278B MULTI-MODE BASIC OPERATION MODULATED CW OPERATION The MFJ-1278B allows the transmission of CW code practice over a VHF FM radio. To send code practice over a VHF FM radio, the user would use the Modulated CW mode, or MCW. When using the Modulated CW, the MFJ-1278B will key the PTT line of the Radio port and send a keyed audio tone to the microphone input of your radio. Modulated CW can be used on either radio port1 or radio port 2.
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MFJ-1278B MULTI-MODE BASIC OPERATION BAUDOT RTTY & ASCII OPERATION The user can configure the MFJ-1278B RTTY/ASCII modems to copy several shifts, including 170, 425, and 850 Hz shifts. The user can use the MODE command to configure the RTTY/ASCII modems for the different shifts. The MFJ-1278B will transmit and receive RTTY and ASCII at speeds of 45, 50, 57, 75, 100, 110, 150, 200, and 300 baud. The MFJ-1278B transmit and receive WIDE and NARROW shift RTTY or ASCII.
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MFJ-1278B MULTI-MODE BASIC OPERATION If you do not specify a baud rate for the RTTY or ASCII modes, the MFJ-1278B selects the default baud rates. The default baud rates for the RTTY and ASCII modes are 45 and 110 baud respectively. You can select a desired speed by typing the baud rate after the two character code.
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MFJ-1278B MULTI-MODE BASIC OPERATION Note: If the MFJ-1278B is not in transmit mode (i.e. in receive mode), then in order to initiate transmission from a buffer, you must type CONTROL-T twice then enter a number for the buffer. You can tell if the MFJ-1278B is in transmit mode, by observing the PTT LED on the front panel. If PTT LED is lit, MFJ-1278B is in transmit mode. Once the MFJ-1278B completes the transmission, press a CONTROL-R.
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MFJ-1278B MULTI-MODE BASIC OPERATION To enter the converse mode type: K This will take the MFJ-1278B out of the command mode and into converse mode. When the MFJ-1278B enters converse mode, the STA will illuminate. Also after entry into converse mode the MFJ-1278B is in receive mode. You can enter transmit mode by typing CONTROL-T. To re-enter receive mode type a CONTROL-R The command CONTROLC will return you to the command mode, where you will get the cmd: prompt on your screen.
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MFJ-1278B MULTI-MODE BASIC OPERATION AUTOMATIC SIGNAL ANALYSIS The Automatic Signal Analysis or ASA, feature installed in the MFJ-1278B firmware can analyze received signals such as RTTY, ASCII, AMTOR mode b and HF Packet. ASA will tell you the speed, data bits, and if the signal is inverted. ASA automatically switches the MFJ-1278B to the correct mode once you accept the results of the signal analysis by typing OK and .
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MFJ-1278B MULTI-MODE BASIC OPERATION In the case of analyzing a 300 baud signal, the MFJ-1278B will prompt the user that the signal could be PACKET. If this occurs then the user can enter the following command from the cmd: prompt: OK Packet The MFJ-1278B will switch to the 300 baud HF packet mode. If the user just issues the OK command, then the MFJ-1278B will switch to the 300 RTTY or ASCII mode. The number of data bits ASA analyzed, determines if the MFJ-1278B switches into RTTY or ASCII modes.
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MFJ-1278B MULTI-MODE BASIC OPERATION MFJ-1278B will enter converse mode and begin to display text normally. If another RTTY or ASCII signal from another station is received, RBIT must be reset to copy that signal by following the same procedure as described above. RBIT can be set to normal (no inversion) by setting it to "RBIT 0". Note that when using ASA, noise will have major effect on the degree of its effectiveness.
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MFJ-1278B MULTI-MODE BASIC OPERATION Once you have set your operating mode, the user must press the K key and a in order to enter RECEIVE mode. The MARS operator is now ready to receive MARS traffic. The operator must then tune the VFO on the radio so the tuning indicator on the MFJ-1278 is centered on the bar graph display. The received traffic should be coming to the screen, in the proper MARS format.
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MFJ-1278B MULTI-MODE BASIC OPERATION MARSMODE 1- QSO Mode In the MARS QSO mode the Transmit translations are as follows: 1. All carriage returns are converted to CR/CR/LF, or to LF only if preceding character was also CR. 2. "NNNN" is sent as "NNNN" followed by 12 LTRS 3. Characters are translated as follows: Key Press Trans.
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MFJ-1278B MULTI-MODE BASIC OPERATION AMTOR OPERATION AMTOR, AMateur Teletype Over Radio), an error correcting protocol suite, is fully supported by the MFJ-1278B. Two modes are available with AMTOR. These are mode A and mode B. From command mode, AMTOR modeB is entered by typing: MODE AM Note that the MFJ-1278B displays an "a_cmd:" once the AMTOR mode has been entered. This "a_cmd:" command prompt lets you know that you are in AMTOR mode and only AMTOR commands are recognized by the MFJ-1278B.
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MFJ-1278B MULTI-MODE BASIC OPERATION Examples are: Amateur callsign is N2WX; Amtor MYSELCAL is NNWX Amateur callsign is WB2SPE; Amtor MYSELCAL is WSPE AMTOR depends on everyone having a unique selective call. If you find there is already a station using the same call that you would use then you may need to base your ID upon the call district that you're in.
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MFJ-1278B MULTI-MODE BASIC OPERATION Monitoring Mode A, "ARQ" The LISTEN command is useful for monitoring other people's ARQ contacts. To use, tune in a Mode A signal and type LISTEN. Both the CON and STA leds will light until the station is synchronized, at which time the MFJ-1278B will start to receive. Since the monitoring of MODE A signals is not error protected, you may see occasional errors. How well the MFJ-1278B receives Mode A signals depends on the quality of the signal.
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MFJ-1278B MULTI-MODE BASIC OPERATION AMTOR Status LED Indicators The CON and STA LEDs have special meanings in the AMTOR modes. STA OFF CON OFF This led combination indicates that Mode B is unlocked, and in STANDBY mode. Standby mode is where the MFJ-1278B is ready to respond to Mode A or B "FEC" Amtor signals. The MFJ-1278B will also print Mode S "SELCAL" signals, depending on the setting of the SRXALL and MYSELCAL commands. STA OFF CON ON Indicates Mode B is locked in and is in the Idle mode.
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MFJ-1278B MULTI-MODE BASIC OPERATION in idle mode. If you can hear both sides, you can hear the alternate chirps as they are in sync with each other. If you operate Mode B or Mode S, then you should have no problems with AMTOR. These are the broadcast modes and are almost identical to teletype in the way you make contacts. The whole purpose behind Mode B (FEC) is, making the initial contact.
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MFJ-1278B MULTI-MODE BASIC OPERATION You can obtain hardcopy printouts from the bulit-in printer port of the MFJ-1278B. Hardcopy printouts are done with the same printer that you used in the other modes of operation. To make hardcopy printouts type the following at the a_cmd: command prompt: PRINT ON to activate the built-in printer port. Ensure that the printer is turned on and is ON-LINE.
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MFJ-1278B MULTI-MODE BASIC OPERATION NAVTEX OPERATION Navtex is a new direct printing service operating on 518 KHz. NAVTEX stands for Navigational Telex. Navtex broadcasts urgent weather, navigational and other information that is intended for ships. Navtex Stations and Frequencies Navtex Stations currently cover most coastal areas of Europe and the Eastern United States.
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MFJ-1278B MULTI-MODE BASIC OPERATION letter identifies the type of message. Refer to the following explanation of the NAVMSG command for the different types of messages that are identified by this second letter. The NAVMSG and NAVSTN commands allow you to choose both the types of messages you receive and the stations you receive. The other command that applies is the NAVTEX command.
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MFJ-1278B MULTI-MODE BASIC OPERATION The types of Navtex messages currently are: A. B. C. D. E. F. G. H. I. J. Navigational warnings Storm Warnings Reports of Ice Search/Rescue Information Weather forecasts Pilot Service Messages DECCA System LORAN-C Omega Systems SATNAV Systems K thru-Z are not in use at this time. They are reserved for future use. To exit the NAVTEX mode, issue a CTRL-C to obtain the n_cmd: command prompt.
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MFJ-1278B MULTI-MODE BASIC OPERATION FAX OPERATION The MFJ-1278B provides an independent multi-gray level modem to transmit and receive FAX with up to 16 levels of gray. The FAX modes supported by the MFJ-1278B are listed in Table 4-6. These FAX modes include Weather FAX, FAXMODE 3 and Wire Photographs, FAXMODE 1. These 16 gray level FAX modes are supported to the computer screen with the appropriate software and hardware.
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MFJ-1278B MULTI-MODE BASIC OPERATION FAX Formats The MFJ-1278B lets you receive and transmit FAX. The FAX modulator and demodulator of the MFJ-1278B are pre-set at the factory to allow FAX operations without any recalibration. Recalibration is not needed under normal conditions. The MFJ-1278B will support FAX formats listed in Table 4-6. 1 2 Lines per Minute 60 line/min. 90 line/min. 3 4 5 6 7 120 line/min. 240 line/min. 360 line/min. 480 line/min. 180 line/min.
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MFJ-1278B MULTI-MODE BASIC OPERATION FAX Frequency FAX transmitting stations are usually found on the HF bands. Weather FAX stations are generally upper sideband. Some of these stations maintain a regular schedule. Table 4-7 lists the frequencies of some FAX stations. Service Weather Band USB Photographs LSB Frequency (KHz) 3,357.00 4,268.00 4,975.00 6,946.00 10,865.00 12,125.00 20,015 10,680.70 17,673.90 18,434.90 20,738.
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MFJ-1278B MULTI-MODE BASIC OPERATION Receiving FAX From command mode, the MFJ-1278B can be set to FAX mode by typing: MODE FX Select the desired FAX mode by typing: FAXMODE n where n is the FAX format as indicated by the FAX Format Table 4-6. For HF weather FAX, select FAXMODE 3. The default FAX mode for MFJ-1278B is FAXMODE 3 or 120 lines per minute format. This is the format used by most weather FAX stations. For other FAX format use other n value as listed in Table 4-6.
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MFJ-1278B MULTI-MODE BASIC OPERATION After selecting the desired FAX mode, type K to leave command mode and enter the CONVERSE mode. Once in CONVERSE mode the MFJ-1278B is in standby-receive mode. This means that the MFJ-1278B is listening to the radio for the distinctive "tic-tic" that indicates the synchronization period at the beginning of a picture. If the MFJ-1278B hears the "tic-tic" well enough, it will establish a lock onto the signal and start printing to the printer.
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MFJ-1278B MULTI-MODE BASIC OPERATION Display FAX Picture on Computer Screen & Save it to Disk The MFJ-1278B firmware does not support printing to your computer screen or allow you to save FAX pictures in disk files. Printing of fax pictures to your computer screen, and saving pictures to disk are a function of the computer software. Any good terminal program has a save to disk routine.
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MFJ-1278B MULTI-MODE BASIC OPERATION The number of graphics characters, "nnn", following a FAX frame header, depends on the FAXMODE. See horizontal density under the FAXMODE command for more information. Multi-level FAX Picture Raw Data Format In FAX mode the MFJ-1278B can provide data thru the RS-232 port in raw data format. With special terminal software which can support this data format, you can display and save multi-gray levels pictures.
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MFJ-1278B MULTI-MODE BASIC OPERATION After unbiasing: bit # 7 6 5 4 3 2 1 0 data x x a a a b b b x = don't care a,b = first and second pixel groups Coding: If, prior to unbiasing, the value of the data byte is an ASCII p, q, or r, then the received byte is a sync byte. Otherwise, the received byte contains actual display information as described above.
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MFJ-1278B MULTI-MODE BASIC OPERATION The FAX format is changeable by using the FAXMODE command. The MFJ-1278B supports receive or transmit of all FAX formats listed in Table 4-6 in both transmit and receive. In 2 level FAX, pictures saved under one format may NOT be transmitted under a different format. For instance, you can NOT receive and save a FAX picture under FAX format 3, then re-transmit it under FAX format 2 or another FAX format as listed in Table 4-6.
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MFJ-1278B MULTI-MODE BASIC OPERATION The command PIXTONES is used to set the multi-gray levels FAX and SSTV pictures being transmitted. The current PIXTONES is set to 16 gray levels. PIXTONES defines the gray levels of the SSTV and FAX transmitted by the MFJ-1278B. To achieve this you must use a terminal program which supports the multi-gray levels SSTV and FAX transmitting, such the advanced MFJ MultiCom™ terminal program for IBM and compatibles. PIXTONES is defined as 16 values in hexadecimal form.
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MFJ-1278B MULTI-MODE PIXTONES Values (HEX) $86 $8E $92 $AC $9D $AD $B0 $B2 $B6 $B5 $B3 $B8 $BC $BA $BE $B9 $BD $BB $BF BASIC OPERATION FAX/SSTV Transmit Tones (Hz) 1100 (sync) 1200 (sync) 1300 (sync) 1500 (sync) 1550 1600 1650 1700 1750 1800 1850 1900 1950 2000 2050 2100 2150 2200 2250 Table 4-8: FAX/SSTV Multi-Gray PIXTONES Creating FAX Pictures for Transmitting FAX pictures captured by the MFJ-1278B and saved on disk can be re-transmitted at a later time.
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MFJ-1278B MULTI-MODE BASIC OPERATION SLOW SCAN TELEVISION OPERATION The MFJ-1278B opens up a whole new world of digital communications, Slow Scan Television or SSTV. The MFJ-1278B lets you receive black and white SSTV pictures with the built-in printer port in 4 levels of gray. However, with additional software for your computer, it can receive and transmit COLOR or B&W SSTV pictures with up to 16 levels of gray.
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MFJ-1278B MULTI-MODE BASIC OPERATION SSTV Formats The MFJ-1278B provides a dedicated multi-gray level modem for SSTV operation. The modulator and demodulator frequencies of the MFJ-1278B are pre-set at the factory to allow SSTV operation without any recalibration. The MFJ-1278B supports all SSTV formats listed in Table 4-9. TVMODE(n) 1 2 3 4 5 TVX* TVX* TVX* Formats 8.
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MFJ-1278B MULTI-MODE BASIC OPERATION Receiving SSTV Pictures Note that if you are using one of the special terminal programs that supports color or multigray levels SSTV operation, you should follow the instructions given in its operating instruction manual to receive and transmit SSTV. The SSTV operation procedure given in this instruction applies to the receiving of 4-level SSTV pictures with a EPSON graphic printer attacted to the MFJ-1278B printer port.
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MFJ-1278B MULTI-MODE BASIC OPERATION After entering the SSTV mode and you have properly selected the correct TV format, type: K to leave command mode and enter the CONVERSE mode. Once in CONVERSE mode the MFJ-1278B is in standby-receive mode. This means that the MFJ-1278B is listening to the radio for the synchronization signal at the beginning of each SSTV picture. If the MFJ1278B hears the synchronization signal well enough, it will establish a lock onto the signal.
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MFJ-1278B MULTI-MODE BASIC OPERATION TVBreaks are arranged in the following format: White gray Black area area area $ss,$aa,$bb,$cc,$dd,$ee,$ff,$gg,$hh,$ii,$jj,$kk,$ll,$mm,$nn $ss is the Sync value. The default TVBreak value is: $80, $46, $47, $48, $4C, $4F, $52, $54, $59, $5C, $5E, $60, $63, $67, $69 The RXBright command has been updated to support the 16 levels gray.
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MFJ-1278B MULTI-MODE BASIC OPERATION Pixtones command serves the same function as the TVBreak command, but in transmitting of SSTV and FAX pictures. Printing SSTV Pictures to the Screen The MFJ-1278B does not support printing graphics to the computer screen without specific terminal software designed for your particular computer. MFJ offers an optional Starter Pack (MFJ-1289) which will allow you to receive SSTV and display to the computer screen.
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MFJ-1278B MULTI-MODE BASIC OPERATION Coding: If, prior to unbiasing, the value of the data byte is an ASCII p, q, or r, then the received byte is a sync byte. Otherwise, the received byte contains actual display information as described above. The color level of each pixel contain in the data byte is given below: 000 white 001 lightest grey 110 darkest grey 111 black NOTE: If the data byte is NOT a sync byte, you must remove the 30H bias BEFORE extracting the pixel information.
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MFJ-1278B MULTI-MODE BASIC OPERATION The PIXTONES command defines the gray levels of the SSTV and FAX picture being transmitted by the MFJ-1278B. To transmit an SSTV picture, you must use a terminal program such as MFJ-1289 that supports the multi-gray levels SSTV and FAX transmitting. PIXTONES values for SSTV mode is the same as in the FAX mode. Refer to FAX Operation section in this instruction for pixtones information.
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MFJ-1278B MULTI-MODE BASIC OPERATION MFJ-1292 "Picture Perfect" Video Digitizer for the IBM and compatible computers allows you to digitized a picture with a Camcorder or video camera. The digitized picture is stored to disk and it can be converted to any of the SSTV formats supported the MFJ-1278B. Converted SSTV picture can be transmitted by the MFJ-1278B. Contact MFJ Enterprises, Inc. or your MFJ dealer for more information concerning the MFJ1292 Video Digitizer.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION ADVANCED PACKET OPERATION This chapter describes some other aspects of Packet operation that you will not need to be concerned with for everyday conversational operation. You will want to consult this chapter if you are using your station for special applications such as a Packet Personal Mailbox, Bulletin Board, binary file transfers, Packet picture transfers or running a "host" program.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION So $1B in hexidecimal notation is equal to 27 in standard decimal notation. Table 5-1 presents a list of ASCII character codes that are available in most computer manuals.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION stored in the system EPROM. The bbRAM memory stores most of the parameter values in a permanent, but easily changed form. The following commands set special characters that are active in Command Mode. Please refer to the discussions of the special character commands in Chapter 6 for details on the operation of the characters in Command Mode. Also see the section on special input characters in Chapter 4.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION The timing of the automatic entry into data-transfer mode depends on whether you or the other station initiated the connection. If you receive a connect request that your MFJ-1278B accepts, then you will enter data-transfer mode, when your MFJ-1278B sends the connect acknowledgment (ACK) and displays the message: *** CONNECTED TO on your computer monitor screen.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION The following commands set special characters which are active in Converse Mode. Refer to the discussions of these commands for details on the operation of the characters in Converse Mode.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION The display characteristics of the MFJ-1278B are also modified in Transparent Mode. Data is sent to the computer exactly as it is received over the radio, including all 8 bits of each byte received. Features such as auto-linefeed insertion and screen wrap are disabled, and echoing of input characters is disabled.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION A computer file transfer program may be unable to process data fast enough to keep up with output from the MFJ-1278B. In order to be sure of reading every character, a computer must respond to interrupts from its I/O devices. Some simple programs may poll the input register for new data. If the polling is not done often enough, data may be lost. Some computers disable interrupts during disk accesses.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Hardware Flow Control Hardware flow control is less likely to depend on the programming of a particular communications program. DTR and CTS are normally used for flow control signals in Transparent Mode. The command XFLOW OFF enables hardware flow control in Converse Mode and Command Mode. Your computer may receive as many as 2 characters after it signals the MFJ-1278B to stop sending, since some characters may already be "in route" through serial I/O chips.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION The MFJ-1278B can send an automatic identification packet every 9-1/2 minutes when your station is operating as a digipeater. You can enable this feature with the command HID ON. An ID packet is displayed as follows by a monitoring station: W3IWI-3>ID:W3IWI/R You can request a final identification as you take your station off the air with the command ID. The MFJ-1278B will only send identification packets if it has been digipeating.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION You can have your station periodically send an automatic message by enabling "beacons." A beacon can be used to make general-interest announcements, provide packets for other stations to use to test their ability to receive, or announce the presence of a bulletin-board operation. The beacon message is set with the command BTEXT, which works the same way as the CTEXT command.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Commands Affecting Protocol This section describes some of the commands that affect the operation of the packet protocol. Details of the protocol are given in Chapter 9. The MFJ-1278B implements AX.25 Level 2 protocol, a set of rules for formatting messages to other TNCs. The version of AX.25 Level 2 protocol used by the MFJ-1278B can be set to Version 2.0 with the command AX25L2V2 ON, or to Version 1.0 with the command AX25L2V2 OFF.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION 1278B will assume is required for the repeater to drop. If the MFJ-1278B has detected channel activity recently enough that the repeater transmitter should still be on, it will wait only the TXDELAY time before sending data, rather than adding an AXDELAY time as well. The commands TXDELAY, AXDELAY, and AXHANG all set times in units of 10 ms. If AXDELAY is in effect the total keyup delay will be Keyup delay = (TXDELAY + AXDELAY) * 10 in milliseconds.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION The wait time is set by the command DWAIT, which specifies 40 ms intervals. If no digipeating is being done by anyone in the local area, this parameter can be set to 0, but in any event it should be set to the same value by all members of a local packet group. In order to avoid unnecessary packet retries, the MFJ-1278B implements a collisionavoidance strategy which applies to all packets except those being digipeated.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION signals up to 9600 baud, but an external modem is required for operation above 1200 baud. An optional 2400 bps PSK modem board is available from MFJ Enterprises, Inc. This 2400 bps PSK modem board can be installed inside the MFJ-1278B. Radio data rate of 2400/9600 is selectable with software command by the MFJ-1278B. When an external modem is installed and when it is in selected to operate the TURBO LED on the front panel of the MFJ-1278B will light.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION If you want to monitor stations selectively, you can set up a list of up to eight callsigns with the command LCALLS. The callsigns in this list are regarded as "buddies," i.e., the only stations you want to listen to if BUDLIST is ON. Otherwise, the stations in the list will be ignored, and all other stations will be monitored. You can operate a group conversation with some data integrity by having the stations connect in pairs and setting MALL ON and MCON ON.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Multiple connection capability is a very powerful addition to the MFJ-1278B. It is very useful for traffic net operation, multi-user bulletin boards, path checking and so forth. Multiple connection operation is not the same as multi-way operation. With multiple connect, you may establish several point-to-point "links" with various stations.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION If all this seems a bit confusing, don't worry, it is! The only way to really understand multiple connect operation is to try it! Tested and on-the-air, Once you have gained confidence in "normal" packet operation, try setting USERS 2 and get a couple of friends to connect to you. Play with the commands (you can't hurt the MFJ-1278B by issuing commands to it!) and see their effects.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Setting Up your Easy-Mail Mailbox The MFJ Easy-Mail Mailbox can now be operated independently from the standard packet operation. There are certain commands which need to be set. These will be explained later in this instruction. NOTE: Whenever is found in this instruction this means to press the RETURN key, not to type . 1. Under the cmd: prompt, type: MYMCALL n where n is the callsign you wish to use for your mailbox station identification.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Your MFJ-1278B will respond with: |K[MFJ-2.1a-IH$] Mailbox ready n free Mailbox (B, E, H(elp), J, K, L, M, R, S, T)> First of all lets find out what the n free is for. The n free is a "Bytes Free" indicator. This applies only to the Mailbox. This is a great feature, because all users will always know how much space is left in your Mailbox. The Mailbox will update the "Bytes Free" indicator whenever messages are forwarded, added or deleted.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Flag: The message Flag is now very important. All of flags can be set via the S (send) or E (edit) commands. This flag will either be an N or a Y. This will appear in the flag block closest to To: block in the message header. There are different types of flags are as follows: N**Messages with this flag set are all able to forwarded, providing all other criteria is met for a message to be forwardable).
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MFJ-1278B MULTI-MODE ADVANCED OPERATION K## Allows you kill the message in slot nn, where nn is a particular slot number. Remote users may only kill messages that are addressed only to them or originated by them. The local and remote SYSOP can kill any messages, depending on the setting of the new command REMsysop. Please refer to the REMsysop for more detailed information. L This command allows the remote user, local or remote SYSOP to list all messages in the mailbox.
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MFJ-1278B MULTI-MODE R ADVANCED OPERATION This command lets you read messages addressed to you. When you list the messages in the mailbox you notice an N flag next to the messages which you have not read. Once you read those messages the N flag will change to a Y flag. This is an indicator to both you and the SYSOP that the messages have been read. From there you can perform a global kill on all of your messages or the SYSOP can kill them individually.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Mailbox Operation This section will depict the use of the Easy Mail™ mailbox from a remote users point of view. We will discuss the different prompts and messages given by Easy Mail™ and what they mean. So without any further delay, lets get started. 1. The remote user must first establish a connection to your Mailbox station. 2.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION The Mailbox will respond with: Send msg; Control-Z or /EX to end: _ The remote user will then enter the message at the cursor prompt. If you are using a 512K or 128K Mailbox then users can upload disk files into the Mailbox. The 32K version has the same capability, but with 32K RAM capacity. At the end of the message press a Control-Z and the ENTER key. The message will be sent.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION B. You can perform a Global Kill on a group of messages which are under the same callsign. To perform this two (2) conditions must be met: i. All messages must have been read and the message flag must be a Y. ii. The callsign contained in the MYMcall must be the same as the callsign in the MYcall command.
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MFJ-1278B MULTI-MODE 6. ADVANCED OPERATION Anyone who accesses the Mailbox can read messages or that are addressed to him/her. Also a message that is a addressed to ALL, such as bulletins can be read by anyone. Messages can be read by two (2) different methods. Below are the two methods: A. This method will allow the remote user, local or remote SYSOP to read a group of messages. This is only good for a group of messages with the same callsign as MYcall.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION This is the only way the remote users can access your Mailbox.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION The command used to forward a message is FO. All forwards must be done in the stream cmd:mode. This command is by pressing a CTRL-C while in the SYSOP mode. Below is a typical example as to how to use the FO command: FO CALLSIGN Where CALLSIGN is the callsign of the destination mailbox. This callsign must also reside in header of the message to be forwarded. The message header can be altered through the Mailbox Edit command.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION The Mailbox has the capability to be remotely controlled. A callsign can be specified by the SYSOP for this purpose. This would be useful in the case where the SYSOP is out in the field. It would allow him to control the mailbox, and do most of the local SYSOP's duties, such as killing messages, reading, editing message headers for forwarding purposes.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION You have new mail! This is basically the same as the You have mail! message, but this indicates that new mail has been added to the mailbox since the last time it was accessed. ?EH This message occurs when a command issued to the Easy Mail mailbox is not understood. This could be an out of range slot number, missing slot number where one is required, or bad command.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Slotting and Acknowledgment Priority The addition of the SLOTTING AND ACKNOWLEDGMENT PRIORITY feature makes the MFJ-1278B more efficient on packet frequency channels. The MFJ-1278B achieves this greater efficiency by preventing or minimizing packet collisions on busy packet channels. Use of the optional SLOTTING and ACKNOWLEDGMENT PRIORITY routine now in the MFJ-1278B firmware significantly improves the reliability of packet radio connections on shared channels.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Once the FRACK timer times out, even if the ACK finally makes it through before the MFJ1278B sends the retry, the MFJ-1278B sends the original packet anyway. This obviously wastes much time that could be better used clearing the channel of some of the legitimate offered load. It is this feature of the current AX.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Enforcing a channel access delay for all stations on the channel for whom the packet that caused the queue was not intended (& who therefore aren't going to ACK it) allows even ACKs from hidden terminals to get back to the expecting station. This clears that traffic from the offered load list. If the packet was indeed copied and ACKed, further retrys of the same information will not be necessary.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Some HTs and every Azden PCS-2000s that I have ever seen are incapable of operating in a LAN which is using a 300 millisecond setting for this parameter. Most HF linear mode radios are MUCH faster than VHF FM radio. A reasonable setting for HF work is 120 milliseconds (DEAdtime set to 12). This should work fine with virtually any HF radio stable enough to consider using on HF packet.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION The actual value used will depend on the average number of queued up stations there are on the channel during busy periods. ACKWAIT (not directly user settable) This timer actually consists of the sum of the 2 user settable parameters ACKTime and DEAdtime. It represents the time the queued up TNC will wait before transmitting if it has selected slot 0. This allows time for a completely inaudible (to this TNC) ACK to have been sent on the channel without molestation.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Initial Parameter Settings Summary The settings for use at 1200 baud on a VHF FM channel are: ACKprior SLots DEAdtime ACKTime RESPtime ON 3 33 13 0 If you require a nonzero value for this parameter in order to prevent ACKing individual packets in a MAXframe greater than 1 blast, your DCD circuit is not working. Please get it fixed. DWait 0 DWait should be set to 0 even if there are digipeaters on the channel.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION While these settings seem extremely long, they will assure that the stations NOT using the new protocol always get a shot at slot #1. With these settings, the users of the NEW protocol will occasionally capture the channel. Settings of 43 for 1200 baud and 64 for 300 baud could be used to assure that stations NOT using the new protocol always have a shot at slot #0.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Packet Picture Transfer The MFJ-1278B gives you the unique ability to transmit and receive Packet Pictures. Unlike the binary file transfer ability common to all packet controllers that lets you transmit and receive picture files, MFJ-1278B lets you transmit and receive actual packet pictures directly. You can also transmit and receive FAX, SSTV and other graphics formats pictures with the MFJ-1278B in the VHF packet mode.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION DETAILED HF PACKET OPERATION Here we will go into further detail on the HF Packet mode of operation. We will discuss modem center frequency, HF tuning indicator, etc. So without any further delay lets get into HF Packet operation. Radio Setup for HF Packet Operation Setting up your Radio interface will follow exactly the same procedure as for VHF NBFM operation with the exception that you will probably not need to set the modem output level.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION NOTE: Regardless of the type of modem, whether or not the modem has audio filtering built in, 300 baud AFSK modem performance on a High Frequency linear mode (SSB as opposed to NBFM) radio channel will NOT be optimum UNLESS a filter of approximately 500 Hz bandwidth is used in the radio IF strip. There are two reasons why this is the case. First, for the filtering to be fully effective, it has to precede the first hard limiter in the system.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION If the HF radio is to be dedicated to packet use, the 500 Hz filter can be installed in place of the SSB filter. This is possible on ANY radio designed for SSB and CW use. It is important to use lower sideband rather than upper sideband if you are going to use a CW filter in the radio for packet operations. The reason for this is simple. The filter designed for CW operation is usually centered approximately 800 Hz. away from the upper sideband suppressed carrier.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION If your radio has no provision for IF shift, you will have to determine the center frequency of the audio which is passed through the filter and realign the modem to the center frequency of the filtered audio. If you are lucky, this may turn out not to be necessary. The tuning indicator and DCD LED can be used to give you an indication when the modem is aligned with the filter similar to the indications described above.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION 5. Many of the stations on HF packet have no tuning indicator at all and many others have an indicator that is only marginally useful. Unlike VHF FM operation, frequency error between transmitter and receiver cause frequency errors in the modem tones. This is the reason that a good tuning indicator is absolutely essential for HF packet operation. The tuning indicator makes it possible for the operator to reduce the modem to modem frequency error to near zero.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION The adjustment is very easy to perform. Simply tune the radio to a channel which has only noise (no signals whatsoever), then adjust the threshold control so that the DCD LED just flickers occasionally. Set it so that the DCD duty cycle is between 10 and 20 percent.
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MFJ-1278B MULTI-MODE 4. ADVANCED OPERATION Rapidly type a string of 15 to 20 carriage returns . This will cause the MFJ1278B to send a continuous string of unconnected information (UI) frames. Since this will be a relatively long burst of packet transmission, the potential receiving station will have plenty of time to tune your signal in. To a receiving station this will appear on his screen as: YOURCALL > CQ: YOURCALL > CQ: YOURCALL > CQ: YOURCALL > CQ: YOURCALL > CQ: . . . .
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MFJ-1278B MULTI-MODE ADVANCED OPERATION The above method of calling CQ is NOT appropriate for use on one of the crowded calling frequencies. There, everyone is already tuned more or less to the same frequency. To call CQ on one of the calling frequencies do the following: 1. Find the "center" of the channel by tuning the radio so that the tuning indicator is centered on most of the signals. 2. Make sure your "UNProto" field is set to CQ. 3. Enter converse mode. 4.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Here are a few simple suggestions for operating HF packet that should help to get you started. 1. Do NOT try to hold a QSO on one of the calling frequencies. Use the calling frequency only to establish contact and then MOVE OFF TO A CLEAR FREQUENCY to carry on the QSO. Remember to be aware of the frequencies your station is actually transmitting so you can avoid interference to other services such as propagation beacons etc. 2.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION 6. Restrict your use of beacon transmissions as much as possible. If you MUST use a beacon, keep it short and keep the repetition rate as low as possible. More than once a minute is definitely too frequent. once or twice in 10 minutes is more polite. Do not allow your beacons to continue if you are not in attendance. Nobody wants to connect to you just to be ignored. 7.
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MFJ-1278B MULTI-MODE ADVANCED OPERATION Once the operating parameters have been selected, set KISS ON and then issue a RESTART command. The CON and STA LEDs will blink on and off three times to indicate that the MFJ-1278B has entered the KISS mode. Now you may call up a TCP/IP, or another host program that can use KISS or "SLIP". If you find that the MFJ-1278B will not stay in KISS mode, then you will need to deactivate the KISSDOG timer.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS COMMAND PREFACE This chapter serves as a complete reference to all the MFJ-1278B operational commands. These commands control the many variable values, that affect the MFJ-1278B's operation, as well as causing it to perform specific functions, such as connecting to another station to start a QSO.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS This reminds you of what you have done, and indicates that the value has been successfully changed. If you type something the MFJ-1278B can't understand you will get an error message. If you type an unrecognized command, you will see the message ?EH. If you get a command name correct, but the arguments are wrong, you will see the message ?BAD. A complete list of error messages appears at the end of this chapter. For example, cmd: ASDFASDF This is not a command.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS Parameters There are several types of parameters. Some parameters can have one of only two values, such as ON and OFF or EVERY and AFTER, known as KEYWORDS. If a parameter must be one of two values, the choices are separated by a forward slash, /. You may use YES instead of ON and NO instead of OFF. A parameter designated as n is a numeric value.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS means that the command CONNECT requires a callsign argument, call1. You may optionally include the keyword VIA, followed by a list of one to eight callsigns, call2 through call9. The callsigns in the list, if included, must be separated by commas (as shown), or by blank spaces. An acceptable command might be C N2WX V AD7I WB9FLW. You can see the current value of the command's arguments by typing the command name by itself, without any arguments.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS COMMAND EXPLANATION 8BITCONV ON/OFF Mode: Packet Default: OFF Parameters: ON The high-order bit is not stripped in Converse Mode. OFF The high-order bit is stripped in Converse Mode. This command enables transmission of 8-bit data in Converse Mode. If 8BITCONV is OFF, the high-order bit (bit 7) of characters received from the terminal is removed before the characters are transmitted in a packet.
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MFJ-1278B MULTI-MODE 16LEVELS ON/OFF OPERATIONAL COMMANDS Mode: FAX/SSTV Default:ON Parameters: ON The MFJ-1278B will transmit and receive FAX and SSTV in 16 gray levels. OFF The MFJ-1278B will transmit and receive FAX and SSTV in 8 or 4 gray levels depending on how the MULTIFAX and 8LEVELS commands are set. In FAX and SSTV modes, if 16LEVELS is ON and 8Levels is OFF, the MFJ-1278B will receive and transmit FAX and SSTV data in 16 gray levels.
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MFJ-1278B MULTI-MODE ACKPRIORITY ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: ON ACKPRIORITY permits an acknowledging TNC to transmit without regard to the slotting delay. Turning ACKPRIORiyty ON to enable prioritized acknowledgement. If ACKprior is turned off and SLots (see SLots) is set to 0, the modified AX.25 protocol is effectively disabled. The MFJ-1278B will behave like normal AX.25 protocol.
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MFJ-1278B MULTI-MODE ALTCALL ssss OPERATIONAL COMMANDS Mode: AMTOR Default: blank Parameter: ssss Designates a four letter SELCALL for use in Mode A Amtor The SELCALL used in the ALTCALL command is the alternate SELCALL for Mode A Amtor operations. ALTCALL is used to set up an alternate SELCALL that the MFJ-1278B responds to in mode A. Whether the MFJ-1278B uses this SELCALL or not, depends on the setting of the AALT command.
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MFJ-1278B MULTI-MODE ANSWRQRA ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: ON Parameter: ON MFJ-1278B responds to non-digipeated UI frames addressed to QRA, within 1 to 16 seconds, with an empty ID packet. OFF Disables MFJ-1278B 's ping-response function. QRA ("Who are you") pinging is supported by the MFJ-1278B. A QRA ping polls all of the TNCs within range. A random number of seconds later, each TNC that heard the QRA ping will transmit its identification packet.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS The ARQ command initiates a Mode A "ARQ" link. ssss is the SELCAL of the station you wish to link with. When ARQ is first issued, the MFJ-1278B begins to key the transmitter in attempt to establish the link, to the specified SELCALL. Both the CON and STA LEDs immediately light to indicate the 'phasing' condition. If the remote station answers, the link is established. The STA LED extinguishes and the CON LED remains lit.
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MFJ-1278B MULTI-MODE ASPECT n OPERATIONAL COMMANDS Mode: FAX Default: 3 Parameter: n = 2 thru 8 ASPECT is used to establish a reasonable aspect ratio between horizontal and vertical presentation of 2-Level or 8-Level FAX graphics. The ASPECT command does not apply to 16 Level FAX graphics. It is necessary to have an ASPECT control because the vertical density a dot matrix printer can represent is much less than the representable horizontal density.
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MFJ-1278B MULTI-MODE AUTOBAUD ON/OFF OPERATIONAL COMMANDS Mode: All Default: ON Parameter: ON Tells the MFJ-1278B to set itself to the users terminal baudrate OFF Tells the MFJ-1278B to remember the last terminal baudrate it last set itself to. When the AUTOBAUD command is ON, the MFJ-1278B will attempt to synchronize with the user's terminal baud rate. When powered up, the MFJ-1278B will wait until it detects a carriage return from the keyboard.
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MFJ-1278B MULTI-MODE AUTOLF ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: ON Parameters: ON A linefeed character () is sent to the terminal after each carriage return character (). OFF A is not sent to the terminal after each . AUTOLF controls the display of carriage return characters received in packets as well as echoing those that are typed in. If the MFJ-1278B's sign-on message lines appear to be typed over each other, you should set AUTOLF ON.
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MFJ-1278B MULTI-MODE AUTOTRAC ON/OFF OPERATIONAL COMMANDS Mode: CW Default:ON Parameters: ON Allows automatic speed tracking of incoming CW signals. OFF Automatic speed tracking of incoming CW signals is disabled. When AUTOTRAC is set ON, the MFJ-1278B attempts to continually track the speed of all incoming CW signals as the speed changes, of a station that is being received.
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MFJ-1278B MULTI-MODE AX25L2V2 ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: ON Parameters: ON The MFJ-1278B will use AX.25 Level 2 Version 2.0 protocol. OFF The MFJ-1278B will use AX.25 Level 2 Version 1.0 protocol. Some implementations of the earlier version of AX.25 protocol (e.g., TAPR's TNC 1) will not properly digipeat version 2.0 AX.25 packets. This command exists to provide compatibility with these other TNCs until their software has been updated.
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MFJ-1278B MULTI-MODE AXHANG n OPERATIONAL COMMANDS Mode: Packet Default: 0 Parameters: n 0 - 20, specifying the voice repeater hang time in 100 ms intervals. This value can be used to increase channel efficiency when an audio repeater with a hang time greater than 100 ms is used. For a repeater with a long hang time, it is not necessary to wait for the repeater keyup delay after keying the transmitter if the repeater is still transmitting.
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MFJ-1278B MULTI-MODE BEACON EVERY|AFTER n OPERATIONAL COMMANDS Mode: Packet Default: EVERY 0 Parameters: n 0-250, specifying beacon timing in 10 second intervals. A value of 0 disables the beacon. EVERY Send beacon at regular intervals. AFTER Send beacon once after the specified time interval with no packet activity. This command enables the sending of beacons and causes the first beacon frame to be transmitted.
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MFJ-1278B MULTI-MODE BKONDEL ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: ON Parameters: ON The sequence is echoed when a character is deleted from the input line. OFF The character (\) is echoed when a character is deleted. This command determines the way the display is updated to reflect a character deletion in Command Mode or Converse Mode. The sequence will properly update the screen of a video display.
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MFJ-1278B MULTI-MODE BLP ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON Puts the MFJ-1278B into Host Mode OFF Takes the MFJ-1278B out of Host Mode Setting the BLP command to ON, puts the MFJ-1278B into Host Mode. After you turn BLP ON and enter transparent mode the host code will run. Once BLP is ON, subsequent RESTARTS and power up cycles will be directly and silently into transparent mode and it will continue to do so until you turn BLP back OFF or the bbRAM fails.
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MFJ-1278B MULTI-MODE BTEXT text OPERATIONAL COMMANDS Mode: Packet Default: "" Parameters: text Any combination of characters, numbersand spaces, up to a maximum length of 128 characters. BTEXT specifies the content of the data portion of a beacon packet. The default text is an empty string, i.e., no message. Beacon packets are discussed in more detail under the BEACON command. NOTE: BEACONS will not be sent if BTEXT is null.
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MFJ-1278B MULTI-MODE BUF n OPERATIONAL COMMANDS Mode: CW/RTTY/ASCII Default: empty Parameter: n = 0 thru 9 Allows you to load up to ten buffers for use in the CW/RTTY/ASCII modes. Maximum buffer text for each buffer is 120 characters. Note that when loading buffer text, there is no space between the word "BUF" and the buffer number selected. Buffers may be transmitted by setting up for the appropriate mode, and typing the "ASENDCHAR" character (Ctrl-T). This causes the MFJ-1278B to enter transmit mode.
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MFJ-1278B MULTI-MODE BWNL ON/OFF OPERATIONAL COMMANDS Mode: AMTOR Default: OFF BWNL controls whether the MFJ-1278B in mode B FEC waits for you to send a newline character ( ) before it starts transmitting the data. If BWNL is OFF then every character you transmit in mode B will be sent as soon as possible. If BWNL is ON, the MFJ-1278B will buffer the entire line sending it only when you have completed it, and pressed the RETURN key. This willallowyou to fix typing mistakes before transmission.
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MFJ-1278B MULTI-MODE CALSET n OPERATIONAL COMMANDS Mode: All Default: NONE Parameters: n 0-65535, specifying the count setting for use by the calibration routine. The number to be specified by CALSET is determined by the frequency f to be calibrated as follows. n = (525,000 / f) + 1 (modulator tones) n = (262,500 / f) + 1 (demodulator tones) In calibrating the modulator tones, the frequency f will be the actual modulator tone desired.
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MFJ-1278B MULTI-MODE CANPAC n OPERATIONAL COMMANDS Mode: Packet Default: $19 Parameters: n 0 - $7F, specifying an ASCII character string code. CANPAC is used to change the cancel-packet input editing command character. The parameter n is the ASCII code for the character you want to type in order to cancel an input packet. You can enter the code in either hex or decimal. If you cancel a packet in Converse Mode, the line will be terminated with a character and a new line.
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MFJ-1278B MULTI-MODE CBELL ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON Connect bell enabled OFF Connect bell disabled This command is used to control whether an ASCII $O7 or CTRL-G (BELL) character is sent as part of the connected message. When set ON, the bell character immediately preceeds the asterisk portion of the connected message, e.g.: *** Connected to: When CBELL is ON a tone will also be heard on the external speaker.
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MFJ-1278B MULTI-MODE CCITT ON/OFF OPERATIONAL COMMANDS Mode: RTTY Default: ON The CCITT parameter selects either an internationally recognized character set (CCITT) or the "U.S. TTY" standard. The latter is used by many older, surplus mechanical teletypes that have been taken out of commercial service and placed into amateur use. This parameter is only significant when in Baudot RTTY mode.
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MFJ-1278B MULTI-MODE CHECK n OPERATIONAL COMMANDS Mode: Packet Default: 30 Parameters: n 0-250, specifying the check time in 10 second intervals. A value of 0 disables this feature. This command sets a connection timeout. If a link connection exists between the MFJ-1278B and another station, and the other station "disappears," your MFJ-1278B could remain in the connected state indefinitely, refusing connections from other stations.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS Parameter: nnn Where the nnn variable equals 0 <=n<=255 The CHOChar command is used to designate the Pactor changeover character. character initiates a control direction change in the Pactor signal. This This character can be varied from 0 to 255 decimal, for computers which may not support the default. The default is CTRL-Y. A value of 0 disables the Pactor changeover.
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MFJ-1278B MULTI-MODE CMDTIME n OPERATIONAL COMMANDS Mode: Packet Default: 1 Parameters: n 0-250, specifying Transparent Mode timeout value in 1 second intervals. If n is zero, the only exit from Transparent Mode is to send a BREAK signal or interrupt power to the MFJ-1278B. This command sets the Transparent Mode timeout value. In order to allow escape to Command Mode from Transparent Mode while permitting any character to be sent as data, a guard time of n seconds is set up.
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MFJ-1278B MULTI-MODE CONPERM ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON The current connection on the current stream will not be allowed to enter the disconnected state. OFF The current stream may be connected to and disconnected from other stations. This command, when switched ON, forces the MFJ-1278B to always maintain the current connection, even when frames to the other station exceed RETRY attempts to get an acknowledgment.
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MFJ-1278B MULTI-MODE CMSG ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON A text message is sent as the first packet after a connection is established. OFF The text message is not sent. CMSG enables automatic sending of the message set by CTEXT whenever your MFJ-1278B accepts a connect request from another TNC.
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MFJ-1278B MULTI-MODE COMMAND n OPERATIONAL COMMANDS Mode: All Default: $03 Parameters: n 0 - $7F, specifying an ASCII character code. This command is used to change the Command Mode entry character. You can enter the code in either hex or decimal. Command Mode is entered from Converse Mode when this character is typed. If you type the Command Mode entry character while you are already in Command Mode, nothing will happen. To see how this works, enter Converse Mode by typing CONVERS.
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MFJ-1278B MULTI-MODE CONMODE CONVERS/TRANS OPERATIONAL COMMANDS Mode: Packet Default: CONVERS Parameters: CONVERS Sets automatic entry to Converse Mode when a connection is established. TRANS Sets automatic entry to Transparent Mode when a connection is established. CONMODE controls which mode the MFJ-1278B will be placed in after a connection is established. The connection may result either from a connect request received over the air or a connect initiated by a CONNECT command that you issued.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS CONNECT call1 [Via call2[,call3...,call9]] Mode: Packet Immediate Command Parameters: call1 Callsign of TNC to be connected to. call2 Optional callsign of MFJ-1278B to be digipeated through. digipeat addresses can be specified. As many as eight The part of the command line in brackets, VIA call2[, call3...,call9] is optional. The doublebracketed text, ,call3...,call9, is also optional, but would only be used if VIA call2 is present.
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MFJ-1278B MULTI-MODE CONOK ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: ON Parameters: ON Connect requests from other TNCs will be accepted. OFF Connect requests from other TNCs will be rejected. This command determines the action taken by the MFJ-1278B when a connect request for it is received though the radio.
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MFJ-1278B MULTI-MODE CONSTAMP ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON Connect and disconnect status messages are time stamped. OFF Connect status messages are not time stamped. This command enables time stamping of *** CONNECTED status messages. The date and time information is then available for use by Bulletin Board programs or other computer applications. The date and time must be set initially by the DAYTIME command before time stamping will occur.
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MFJ-1278B MULTI-MODE CPACTIME ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON Packet timeout is used in Converse Mode. OFF Packet timeout is not used in Converse Mode. This command enables the periodic automatic sending of packets in Converse Mode. This feature may be used for computer communications, such as Bulletin Board operation, when the full Transparent Mode features are not desired.
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MFJ-1278B MULTI-MODE CTEXT text OPERATIONAL COMMANDS Mode: Packet Default: "" Parameters: text Any combination of characters and spaces, up to a maximum length of 120 characters. CTEXT specifies the text of the packet to be sent after a connection is made, if CMSG is ON. The default text is an empty string, i.e., no message. You can send multiple-line messages by including carriage return () characters in the text.
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MFJ-1278B MULTI-MODE CWCALL ssss OPERATIONAL COMMANDS Mode: Amtor Default: blank Where "ssss" are 15 characters sent as CW when you issue the ID character. The "ssss" text is sent following the QRA ("The name of my station is ______") signal. CWidmode nn: 0<=nn<=255 Mode: Pactor Default 0 Should CW identification be required, the MFJ-1278B now supports 8 CW identification modes. Seven automatic modes are selected by the bit-mapped CWIDMODE parameter.
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MFJ-1278B MULTI-MODE CWSENDCH nnn OPERATIONAL COMMANDS Mode: CW Default:$FF Parameter: nnn = $00 to $FF; specifying the CW xmit character. This controls when the MFJ-1278B transmits the pending text in the CW buffer. It is only effective for CW and MCW modes. If this is left at the default of 000, the characters to be transmitted are left buffered and unsent until such time as either a SPACE, CARRIAGE-RETURN, or other control character is sent.
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MFJ-1278B MULTI-MODE DAYTIME date&time OPERATIONAL COMMANDS Mode: Packet No default Parameters: date&time Current date and time to set. This command allows you to set the current date and time for the MFJ-1278B. The format for entering the date&time is yymmddhhmm where yy is the last two digits of the year, mm is the two- digit month code (01-12), dd is date (01-31), hh is the hour (00-23), and mm is the minutes after the hour (00-59).
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MFJ-1278B MULTI-MODE DAYUSA ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: ON Parameters: ON Date is displayed in the format mm/dd/yy. OFF Date is displayed in the format dd-mm-yy. This command determines the format for the MFJ-1278B's display of the date. If DAYUSA is ON, the standard U.S. format is used; if DAYUSA is OFF, the standard European format is used.
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MFJ-1278B MULTI-MODE DEADTIME nnn OPERATIONAL COMMANDS Mode: Packet Default: 33 Parameter: nnn 0 thru 250 in 10ms. The DEADTIME parameter selects the basic time interval used by the slotting procedures. A delay of length = (random multiple of DEADTIME) will be applied to the all outgoing packets that are not acknowledgmented. DEADTIME must be set to a value that accounts for the slowest acceptable station on the channel.
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MFJ-1278B MULTI-MODE DELETE ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON The delete character input editing character is ($7F). OFF The delete character input editing character is ($08). This command is used to change the input editing command for character deletion. When this character is typed, the last character from the input line is deleted. How the TNC indicates the deletion is controlled by the BKONDEL command.
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MFJ-1278B MULTI-MODE DIGIPEAT ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: ON Parameters: ON The MFJ-1278B will digipeat packets if requested. OFF The MFJ-1278B will not digipeat packets. When this parameter is ON, any packet received that has your TNC's callsign (including SSID) in the digipeat list of its address field will be retransmitted.
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MFJ-1278B MULTI-MODE DISPLAY [class] OPERATIONAL COMMANDS Mode: All Immediate Command Parameters: class Optional parameter-class identifier, one of the following: ASYNC Displays asynchronous port parameters CHARACTE Displays special characters ID Displays ID parameters LINK Displays link parameters MONITOR Displays monitor parameters TIMING Displays timing parameters S Displays a group of parameters such as memory buffer contents, CW parameters and parameters which affect the printing of g
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS BBFAILED: Counts number of times bbRAM checksum was in error. DIGISENT: Each frame digipeated by the MFJ-1278B causes the counter to increase. HOVRERR: Increases when HDLC receiver is not serviced rapidly enough and data is lost. This counter should never increment at any supported data rate. HUNDRERR Increases when the HDLC transmitter is not serviced rapidly enough and frames are aborted. This counter should never be non-zero at any supported data rate.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS RXERRORS: Increments each time a received frame is thrown out due to it being too short, suffering overrun(s), or it having a bad CRC. Latter occurs only when CRC checking is enabled (i.e. HGARBAGE is OFF). This counter will often increment in the presence of noise. RXLENERR: RXLENERR counts the number of too-short frames received. The counts are of diagnostic use only and here again, non- zero counts are not a matter of concern.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS DISPLAY is an immediate command, and with no class parameter will cause all control parameters and their current values to be displayed. Sub-groups of related parameters can be displayed by specifying the optional parameter-class. Individual parameters can be displayed by entering the parameter name with no options. DISPLAY Mode: AMTOR Immediate Command Used to display all of the current AMTOR parameters, type DISPLAY at the "a_cmd:" prompt.
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MFJ-1278B MULTI-MODE EAS ON/OFF OPERATIONAL COMMANDS Mode: CW/RTTY/ASCII Default: OFF Parameter: ON Enables Real Time echoing of out-going CW, RTTY, and ASCII text OFF Disables Real Time echoing of out-going CW, RTTY, and ASCII text ECHO-AS SENT is basically the same as the EAS in AMTOR, but is a separate command from AMTOR. This command must be set independently from the AMTOR EAS command. When issued from the cmd: prompt, enables Real Time echoing of out-going CW, RTTY, and ASCII text.
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MFJ-1278B MULTI-MODE ECho ON/OFF OPERATIONAL COMMANDS Mode: Pactor Default ON Parameter: ON Characters received from the computer or terminal are echoed by the MFJ-1278B. OFF Characters are not echoed. The ECho command in Pactor performs the same function as in Packet mode, except that echoing is deferred when EAA is ON as described above. EPSON ON/OFF Mode: All Default: ON Parameter: ON Enables EPSON graphics mode to the MFJ-1278B printer port.
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MFJ-1278B MULTI-MODE ESCAPE ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON The character ($1B) is output as "$" ($24). OFF The character is output as ($1B). This command specifies the character which will be output when an character is to be sent to the terminal. The translation is disabled in Transparent Mode.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS FARNSWOR ON/OFF Mode: CW Default: ON Parameters: ON Enables the FARNSWORTH special spacing. OFF Disables the FARNSWORTH special spacing. Many find training for CW tests with a FARNSWORTH method of code generation more valuable because it teaches letter recognition at a speed fast enough to avoid the common learning "plateau". Some people have trouble passing this plateau as they increase their code speed.
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MFJ-1278B MULTI-MODE FAXNEG ON/OFF OPERATIONAL COMMANDS Mode: FAX Default: OFF Parameters: ON Reverses the FAX image on screen..i.e. black to white OFF Disables FAX image reversal. Normal operation. Setting FAXNEG ON causes the MFJ-1278B to invert the screen image. This means the white areas of the FAX pictures will be black, and the black areas to be white. The synchronization bar is not inverted.
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MFJ-1278B MULTI-MODE FLOW ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: ON Parameters: ON Type-in flow control is active. OFF Type-in flow control is disabled. When type-in flow control is enabled, any character entered from the terminal will halt output to the terminal until: (1) a packet is forced (in Converse Mode); (2) a line is completed (in Command Mode); (3) the packet length is exceeded; or (3) the terminal output buffer fills up.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS Parameters: n 1 - 15, specifying frame acknowledgment time-out in 1 second intervals. After transmitting a packet requiring acknowledgment, the MFJ-1278B will wait for the specified frame acknowledgment timeout before incrementing the retry counter and sending the frame again. If the packet address includes relay requests, the time between retries will be adjusted to Retry interval = n * (2*m + 1) where m is the number of intermediate relay stations.
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MFJ-1278B MULTI-MODE GRAPHLF ON|OFF OPERATIONAL COMMANDS Mode: FAX/SSTV Default: OFF Parameters: ON Graphics line-feed issued before carriage return. OFF Graphics lin-feed not issued before carriage return. For FAX and SSTV receive modes, the GRAPHLF setting determines whether the MFJ1278B will issue a line feed (ASCII value 10 decimal) character before the carriage return on every line of graphics. For most printers, GRAPHLF should be set to ON.
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MFJ-1278B MULTI-MODE HEALLED ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON The MFJ-1278B will "dither" the CON and STA LEDs. OFF The MFJ-1278B will control the CON and STA LEDs in normally. This command allows the user to redefine the functions of the two CPU controllable LEDs (i.e. the STAtus and CONnect LEDs). When HEALLED is set ON, the two LEDs flash in a seemingly random fashion.
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MFJ-1278B MULTI-MODE ID OPERATIONAL COMMANDS Mode: Packet Immediate Command ID is an immediate command. It will send a special identification packet. ID can be used to force a final identification packet to be sent as a digipeater station is being taken off the air. The identification packet will be sent only if the digipeater has transmitted since the last automatic identification. An identification consists of an unsequenced I frame whose data field is your station identification.
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MFJ-1278B MULTI-MODE KILONFWD ON/OFF OPERATIONAL COMMANDS Mode: Mailbox Default: OFF Parameters: ON Messages forwarded out of Mailbox will be killed after a forwarding process is complete. OFF Default; Messages forwarded out of the Mailbox are not killed after a forwarding process is completed. The setting of KILONFWD determines whether or not the TNC deletes a message after it has been forwarded. If your Mailbox RAM space is critical then you might want to set this command ON.
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MFJ-1278B MULTI-MODE Lc callsign OPERATIONAL COMMANDS Mode: Pactor Immediate Command Initiates an ARQ link to the specified callsign using extended LONGPATH timing to support long txdelays or long skip paths. This type is generally used when the destination is over 40,000 Km away, where the standard Connect command timing will not work. LCALLS call1[,call2...,call8] Mode: Packet Default: "" Parameters: call Callsign list. Up to 8 calls, separated by commas.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS Parameters: ON The MFJ-1278B will translate the character immediately following the STREAMSWITCH character to upper case before processing it. OFF The MFJ-1278B will process the character STREAMSWITCH character as it is entered. immediately following the When operating multi-connect, the user must enter a stream identifier (default A through J) after the STREAMSWITCH character (default |) to select a new logical stream to send data.
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MFJ-1278B MULTI-MODE LFADD ON|OFF OPERATIONAL COMMANDS Mode: ASCII/Packet Default: OFF When LFADD is ON and the ASCII or Packet mode is selected, MFJ-1278 will append an ASCII line feed character, $0A, to the transmission immediately after a carriage return is sent. LFADD should usually be switched OFF as the vast majority of TNCs (including the MFJ1278B) are configured to automatically go to a new line whenever a carriage return is printed.
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MFJ-1278B MULTI-MODE LISTEN OPERATIONAL COMMANDS Mode: AMTOR Immediate Command LISTEN is used to begin monitoring someone else's Mode A connection. You'll need to enter LISTEN to tell the MFJ- 1278B to start synchronizing to the desired signal. LISTENing to Mode A connections can be irritating if conditions are poor because there is no error correction afforded to stations which are not active participants in the QSO.
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MFJ-1278B MULTI-MODE MAILBOX ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: ON Parameters: ON Brings the Packet mailbox on-line. OFF Takes the Packet mailbox off-line. When the MAILBOX command is set to ON, all of the mailbox functions are active. Note that the MAILBOX is a single-user device; therefore, if you wish to use the MAILBOX it is necessary for you to set USER 1 and select Stream A. Note that these are the default settings and selections, respectively.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS B Logout: Initiates a disconnect sequence from the mailbox. Edit This allows you to Edit the message headers for a Forwarding or Reverse Forwarding process. J This function when initiated responds with the TNC's MHeard list. This list will contain the eleven most recently heard stations. M This will let a remote user switch memory banks in the Mailbox RAM. T When this command is initiated will allow a remote user to PAGE the SYSOP.
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MFJ-1278B MULTI-MODE MARSMODE n OPERATIONAL COMMANDS Mode: RTTY/ASCII Default: 0 n n=0 to 3 if n=0, MARS QSO mode The MARsmode command provides two levels of MARS compatibility. Minimal translation is provided by "QSO" mode. In the QSO mode, the MFJ-1278 assumes the user is manually sending and receiving.
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MFJ-1278B MULTI-MODE MATCH ON/OFF OPERATIONAL COMMANDS Mode: AMTOR Default: ON MATCH is used for selectively monitoring portions of Mode B FEC transmissions. If MATCH is ON, the MFJ-1278B will not start printing a Mode B signal until the string set in MBEGIN is matched. Likewise, the search for the terminating string in the MEND parameter begins when the MFJ-1278B starts printing.
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MFJ-1278B MULTI-MODE MAXSum nn OPERATIONAL COMMANDS Mode: Pactor Default: 30 Parameters: nnn: 5<=nnn<=120 MAXSum specifies the number of cycles of error-laden information packets received that are accumulated in the Digital Memory ARQ sum buffer for reconstruction. When MAXSUM consecutive information receive errors occur, on the next receive cycle the sum buffers are re-initialized to inhibit the corruption of real-time reception by historical receive errors.
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MFJ-1278B MULTI-MODE MCOM ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON Connect, disconnect, UA, and DM frames are monitored. OFF Only information frames are monitored. This command enables monitoring of connect and disconnect frames when MONITOR is ON. When MCOM is OFF, only I frames (packets containing user information) will be displayed. When MCOM is ON four protocol packets will also be displayed.
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MFJ-1278B MULTI-MODE MCTEXT text OPERATIONAL COMMANDS Mode: Mailbox Default: " " Text: Any combination of characters and spaces, up to 120 characters in length. The MCTEXT command works like CTEXT except that MCTEXT is sent only when the mailbox MYMcall is connected to. There is no express equivalent to the CMSG ON/OFF command. If MCText is empty, no string is sent. If the is message longer than 120 characters an error message will be given and the command is ignored.
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MFJ-1278B MULTI-MODE MHCLEAR OPERATIONAL COMMANDS Mode: Packet Immediate Command MHCLEAR is an immediate command. It causes the list of stations heard to be cleared. You can use this command in conjunction with MHEARD to keep track of the stations on the air over a given period of time, such as an evening or a week. Clear the list of stations heard when you first begin to monitor the packet activity. MHEARD Mode: Packet Immediate Command MHEARD is an immediate command.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS Parameter: ON Enables printing Non-Printable Characters. OFF Discards all Packets containing Non-Printable Characters. The setting of the MNONPRINT parameter determines whether monitored packets containing non-printable characters (i.e., characters other than ASCII CR, LF, BEL, and not between $20 and $7e) are monitored or simply discarded. The default setting permits monitoring all information packets (subject to LCALLS, MONITOR, MNONAX25, etc).
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MFJ-1278B MULTI-MODE MRPT ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: ON Parameters: ON Display the stations in the digipeat path for monitored packets. OFF Display only the source and destination stations for monitored packets. This command affects the way monitored packets are displayed. If MRPT is OFF, only the originating station and the destination are displayed for monitored packets.
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MFJ-1278B MULTI-MODE MSTAMP ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON Monitored frames are time stamped. OFF Monitored frames are not time stamped. The MSTAMP command enables time stamping of monitored packets. The date and time information is then available for use for automatic logging of packet activity or other computer applications. The date and time are set initially by the DAYTIME command, and the date format is determined by the DAYUSA command.
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MFJ-1278B MULTI-MODE MULTIFAX ON/OFF OPERATIONAL COMMANDS Mode: FAX Default: OFF Parameters: ON MFJ-1278B is set to transmit and receive FAX picture in raw data format. OFF MFJ-1278B is set to transmit and receive FAX picture in 2 levels format. When MULTIFAX is turned ON, MFJ-1278B is set to transmit and receive multi-level FAX pictures.
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MFJ-1278B MULTI-MODE MYcall callsign OPERATIONAL COMMANDS Mode: Pactor Default: MFJPACTR The MYCALL command is the same as the MYCALL command used in the Packet mode. The MYCALL command can take callsigns up to 8 characters in length. The callsign used must be at least 4 characters in length. MYALIAS call[-n] Mode: Packet Default: Parameters: call Alternate identity of your MFJ-1278B. n 0-15, an optionally specified sub-station ID (SSID).
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MFJ-1278B MULTI-MODE MYHIERAD Text OPERATIONAL COMMANDS Mode: Mailbox Default: " " Text Any combination of characters and spaces, up to 60 characters in length. You may use this parameter to generate a customized "@:" portion of the tagline your TNC will insert in forwarded messages. If MYHIERAD is blank, the default @ portion will read "@:". It is suggested that you insert your hierarchical address, location, and zip/postal code in this parameter.
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MFJ-1278B MULTI-MODE NAVTEX ON/OFF OPERATIONAL COMMANDS Mode: Navtex Default:OFF Parameters: ON Navtex receive mode is enabled. OFF Navtex receive mode is disabled. NAVTEX is an immediate command. The NAVTEX command must be issued under the "a_cmd:" Amtor command prompt. Under the "a_cmd:" command prompt, type NAVTEX or the abbreviation to put your MFJ-1278B into NAVTEX receive mode. While in NAVTEX receive mode the signals on 518 KHz are available to the MFJ-1278B to receive.
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MFJ-1278B MULTI-MODE NAVMSG OPERATIONAL COMMANDS Mode: Navtex Default: ALL The NAVMSG command works like the NAVSTN command with the ALL parameter used to exclude all, or to specify the type of messages to receive. The types of Navtex messages currently are: A: B: C: D: E: F: G: H: I: J: Navigational warnings Storm Warnings Reports of Ice Search/Rescue Information Weather forecasts Pilot Service Messages DECCA System LORAN-C Omega Systems SATNAV Systems K thru-Z are not in use at this time.
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MFJ-1278B MULTI-MODE NO200 ON/OFF OPERATIONAL COMMANDS Mode: Pactor Default: OFF Parameters: ON Inhibits 200 baud operation in Pactor mode. OFF Allows 200 baud operation in Pactor mode. The NO200 command controls whether 200 baud links are to be discouraged. The TNC accomplishes this in two ways: 1. Speedups are inhibited. 2. Incoming connect requests are acknowledged for 100 baud. The NO200 command works most effectively when both units are capable of NO200 operation.
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MFJ-1278B MULTI-MODE NODEPATH text string OPERATIONAL COMMANDS Mode: Mailbox Default:" " Parameters: text string; specifying node connect string Enter the command the TNC will command the node connected by the NODEFORW command to link with the receiving BBS. Example: cmd: NODEPATH C KB4VOL cmd: NODEFORW PSL5 This sequence first connects to the PSL5 node. When connected, the TNC sends the node connect command "C KB4VOL" to establish a link with the receiving bbs, KB4VOL.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS Parameters: ON characters are sent to the terminal following characters. OFF characters are not sent to the terminal following characters. This command causes transmission of characters (ASCII code $00), producing an effective delay following any sent to the terminal. The number of characters is determined by the command NULLS. This delay is required by some display terminals.
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MFJ-1278B MULTI-MODE OMLC ON/OFF OPERATIONAL COMMANDS Mode: AMTOR Default: OFF Parameters: ON Character convert to lower case enabled OFF Character convert to lower case disabled. Output Map to Lower Case (OMLC) when ON instructs the MFJ-1278B to convert all letter characters, except those echoed, to their lower case equivalent. PACLEN n Mode: Packet Default: 128 Parameters: n 0 - 255, specifying the maximum length of the data portion of a packet. The value 0 is equivalent to 256.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS Parameters: n 0 - 3, selecting a parity option from the table below. This command sets the word parity mode for the terminal or computer data transfer according to the following table: n Value Parity 0 1 2 3 no parity odd parity no parity even parity The parity bit, if present, is automatically stripped on input and not checked in Command Mode and Converse Mode. In Transparent Mode, all eight bits, including parity if any, are transmitted in packets.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS Parameters: nnn: 0<=nn<=255 The Pactor PASS command is the same as the PASS command in the other modes. The PASS command does not work for ^Y Changeover. PASSALL ON/OFF Mode: Packet Default: OFF Parameters: ON The MFJ-1278B will accept packets with invalid CRCs. OFF The MFJ-1278B will only accept packets with valid CRCs. This command causes the MFJ-1278B to display packets received with invalid CRC fields.
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MFJ-1278B MULTI-MODE PIXTONES n OPERATIONAL COMMANDS Mode: FAX/SSTV Default: (see below) Parameters: n = $aa,$bb,$cc,.........
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS The PIXTONES values are in Hexidecmal format. If the picture transmitted does not seem to have the right contrast, try reseting the PIXTONES values.
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MFJ-1278B MULTI-MODE PKTPIX ON/OFF OPERATIONAL COMMANDS Mode: Packet Immediate Command PKTPIX is an immediate command that provides a method for the MFJ-1278B, to print packet pictures, and other graphics format data transmitted by another station in the VHF packet mode. The user must be connected to another station, with a printer connected to the built-in printer port. Once connected you must go back to command mode with a CTRL-C, and obtain the cmd: prompt.
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MFJ-1278B MULTI-MODE PRINTGRA ON/OFF OPERATIONAL COMMANDS Mode: FAX/SSTV Default: ON For FAX and SSTV modes, the setting of PRINTGRA determines what the MFJ-1278B does with demodulated graphics. In Multi-Level FAX mode when MULTIFAX command is turned ON, the setting PRINTGRA, ON or OFF, will not be useful. Under 2 level FAX/SSTV format, when PRINTGRA is ON, the MFJ-1278B expects and prints to the Epson graphics printer attached to the printer port.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS The PROfmars command causes the MFJ-1278B to set itself up for MARS operations. The MFJ-1278B sets the following parameters for MARS operation: AUTOLF CCITT DIDDLE LFADDALT LFIGNORE MARSMODE UNSHIFT RXLFNOCR OFF OFF OFF OFF OFF $01 OFF ON PTOver nnn: 0<=nn<=255 Mode: Pactor Default: $19 Parameters: nnn Where the n variable equals 0 <=n<=255 The PTOver character designates the Pactor changeover character.
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MFJ-1278B MULTI-MODE QRT OPERATIONAL COMMANDS Mode: AMTOR Immediate Command The QRT command is an immediate command is used to: 1. End a mode A "ARQ" connection When the contact is completed and you are ready to break the link, issue QRT to break it and return the MFJ-1278B to standby/receive mode. 2. Stop a broadcast in mode B (FEC) and mode S (SELCALL) When you're broadcast is complete type QRT to return the MFJ-1278B to standby / receive mode.
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MFJ-1278B MULTI-MODE RBITMASK $xx OPERATIONAL COMMANDS Mode: RTTY/ASCII Default: 0 Parameters: $xx 0 - $7F, specifying the bit inversion during receiving. The RBITMASK command controls the bit inversion process applied to the received ASCII and RTTY characters. Bit inversion is a simple means of encryption. RBITMASK should be selected to match the inversion pattern of the station you are receiving. RECONNECT call1 [VIA call2[,call3...
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MFJ-1278B MULTI-MODE REDISPLA n OPERATIONAL COMMANDS Mode: All Default: $12 Parameters: n 0 - $7F, specifying an ASCII character code. This command is used to change the redisplay-line input editing character. The parameter n is the ASCII code for the character you want to type in order to redisplay the current input line. You can enter the code in either hex or decimal. You can type this character to cause the MFJ-1278B to retype a line you have begun.
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MFJ-1278B MULTI-MODE RESTART OPERATIONAL COMMANDS Mode: All RESTART is an immediate command. It re-initializes the MFJ-1278B using the commands previously set by the user, and stored in bbRAM. The effect of this command is the same as turning the MFJ-1278B OFF then ON again. RESTART does not cause a reset of the parameters in bbRAM. See also the RESET command. RESET Mode: All RESET is an immediate command.
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MFJ-1278B MULTI-MODE RETries nnn: 0<=nn<=255 OPERATIONAL COMMANDS Mode: Pactor Default: 80 Parameters: nnn; specifying the number of times a packet is transmitted before disconnect The number of error cycles that the MFJ-1278B will tolerate before unilaterally terminating the link. (Also see WAITDISC) RETRY n Mode: Packet Default: 10 Parameter: n 0 - 15, specifying the maximum number of packet retries. The protocol allows for retries, i.e., retransmission of frames that are not acknowledged.
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MFJ-1278B MULTI-MODE RFE ON/OFF OPERATIONAL COMMANDS Mode: AMTOR Default: OFF Parameters: ON Continous retries mode enabled OFF Continous retries mode disables. RFE is the Retry ForEver parameter. When the RFE command is ON, a Mode A call will continue until either a successful link is established, or the "QRT" or "R" command is issued. RINV ON/OFF Mode: AMTOR Default: OFF Parameters: ON Inverting of incoming Amtor data results OFF Incoming Amtor data is not inverted.
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MFJ-1278B MULTI-MODE RXBLOCK ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON The MFJ-1278B will send data to the terminal in RXBLOCK format. OFF The MFJ-1278B will send data to the terminal in standard format. The RXBLOCK command is designed for automated operations, such as packet bulletin board stations. It is intended to help such systems discriminate between data received from the connected station and MFJ-1278-generated messages.
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MFJ-1278B MULTI-MODE RXBRIGHT n OPERATIONAL COMMANDS Mode: FAX/SSTV Default: 4 Parameter: n 0 - 9; specifying a certain set of TVBreak points The RXBRIGHT command is used to select a certain set of TVBreak values for use with the SSTV and Multi-Level FAX modes. The TVBreak sets within the RXBRIGHT command control the brightness and contrast of the received SSTV and Multi-Level FAX pictures. The smaller the RXBRIGHT number, the darker the received picture.
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MFJ-1278B MULTI-MODE RXCAL OPERATIONAL COMMANDS Mode: All Immediate Command RXCAL is an immediate command. When invoked, the MFJ-1278B generates test signals (based on CALSET -- see below) that are used by the internal tuning software to align the demodulator components. To use the RXCAL feature, 1. Align the modulator components as described in the owners manual. 2. Use the MODE command to select the demodulator to be tuned. Make sure JMP8, JMP7 and JMP 4 are installed. 3.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS CALSET Adjustment & Location Map This is a map of the physical locations of the adjustment potentiometers on the MFJ-1278B circuit board. They are shown as they appear when looking down on top of the board with the board oriented so that the rear panel connectors are to the left. Information in the boxes is organized as shown below. NOTE: Separate procedure required to do alignment of CW demodulator center frequency.
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MFJ-1278B MULTI-MODE RVFALWAY ON/OFF OPERATIONAL COMMANDS Mode: Mailbox Default: ON Parameters: ON Initiates forwards and reverse forwards of all forwardable messages. OFF Mailbox ignores Forward and NODEforw commands. The setting of RVFALWAY(s) controls whether the TNC will initiate forward events, via the FORWARD and NODEFORW commands in the absence of forwardable messages. If OFF, the TNC will ignore FORWARD and NODEFORW commands entered in the absence of forwardable messages.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS Parameters: n 0 - $7F, specifying an ASCII character code. This command selects the character that will force a packet to be sent in Converse Mode. The parameter n is the ASCII code for the character you want to type in order to force your input to be packetized and queued for transmission. You can enter the code in either hex or decimal. For ordinary conversation, you will probably set SENDPAC $0D and CR ON.
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MFJ-1278B MULTI-MODE SETUP OPERATIONAL COMMANDS Mode: ALL Default: see table below All possible baud rates and modem configurations are displayedon the SETUP menu. The selected baud rates and modem configurations are also shown. Anytime the MFJ-1278B default values are loaded the baud rate and modem default profile is loaded as well.
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MFJ-1278B MULTI-MODE SLOTS nnn OPERATIONAL COMMANDS Mode: Packet Default: 3 Parameter: nnn 0 - 127, specified the number of sides on the slot time dice. The SLOTS parameter determines how many sides are on the slot time dice. SLOTS represents an n+1 sided dice the TNC "throws" before transmitting. The SLOTS command allows any number of slots from 1 thru 127 to be defined. SLOTS (n) 1 2 4 8 16 32 64 128 REMARKS Disables Slotting This should be the default setting Use only if the channel is VERY busy.
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MFJ-1278B MULTI-MODE SRXALL ON/OFF OPERATIONAL COMMANDS Mode: AMTOR Default: ON The MFJ-1278B will print all receivable mode S transmissions when SRXALL is on. Taking advantage of the ability to receive an addressed mode S transmission requires SRXALL ON and a match between the address being sent and your MYSELCAL. If SRXALL is OFF and MYSELCAL does not match the address in the received mode S transmission, the MFJ-1278B ignores the transmission.
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MFJ-1278B MULTI-MODE STOP n OPERATIONAL COMMANDS Mode: All Default: $13 Parameters: n 0 - $7F, specifying an ASCII character code. The STOP command selects the User Stop character, which is used to stop output from the MFJ-1278B to the terminal. You can enter the code in either hex or decimal. This is the character you will type to halt the MFJ-1278B's typing so that you can read text before it scrolls off your display.
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MFJ-1278B MULTI-MODE STREAMCA ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON Callsign of other station displayed. OFF Callsign of other station not displayed. This command is used to enable the display of the connected-to station after the stream identifier. This is particularly useful when operating with multiple connections allowed. It is somewhat analogous to the use of MRPT to show digipeat paths when monitoring.
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MFJ-1278B MULTI-MODE STREAMDB ON|OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON Double all received STREAMSWitch characters. OFF Do not "double" received STREAMSWitch characters. This command is used to display received STREAMSWitch characters by "doubling" them. The example below illustrates this action. With STREAMDB on, and STREAMSWitch set to "|", the following might be displayed from your MFJ-1278: || this is a test.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS When the MAILBOX is ON, the System Operator can access the mailbox by typing the immediate command, SYSOP. All commands are available to the SYSOP. When the SYSOP has completed operating the MAILBOX, he must return to command mode with "Control-C" (or the current COMMAND character) to allow the remote users access to the MAILBOX.
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MFJ-1278B MULTI-MODE TRACE ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON Trace mode is enabled. OFF Trace mode is disabled. This command is used to enable the protocol debugging function. When the TRACE command is ON, all received frames will be displayed in their entirety, including all header information.
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MFJ-1278B MULTI-MODE TRANS OPERATIONAL COMMANDS Mode: Packet Immediate Command This is an immediate command. It causes the MFJ-1278B to exit from Command Mode into Transparent Mode. The current link state is not affected. Transparent Mode is primarily useful for computer communications. In this mode, the "human interface" features such as input editing capability, echoing of input characters, and type-in flow control are disabled.
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MFJ-1278B MULTI-MODE TRIES n OPERATIONAL COMMANDS Mode: Packet Default: NONE Parameters: n = 0 -15, specifying the current RETRY level on the currently selected input stream. This command is used to retrieve or force the count of "tries" on the currently selected input stream. When used with no argument: 1. If the MFJ-1278B has an outstanding unacknowledged frame, it will return the current number of tries. 2.
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MFJ-1278B MULTI-MODE TVBREAKS n OPERATIONAL COMMANDS Mode: SSTV Default: (see below) Parameters: n = $aa,$bb,$cc,$dd,........,$kk,$ll,$mm,$nn,$ss TVBreaks are arranged in the following format: * White * gray * Black * * area * area * area * $ss, $aa, $bb, $cc, $dd, $ee, $ff, $gg, $hh, $ii, $jj, $kk, $ll, $mm, $nn |___ Sync The default TVBreak values are as follows: TVB $80, $46, $47, $48, $4C, $4F, $52, $54, $59, $5C, $5E, $60, $63, $67, $69 Note that the values for the TVBREAKS command are in HEX.
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MFJ-1278B MULTI-MODE TVMODE n OPERATIONAL COMMANDS Mode: SSTV Immediate Command Parameter: n = 1 to 5; specifying a SSTV picture format The TVMODE command selects the formats under the SSTV mode for the MFJ-1278B. When the built-in printer port is used to receive SSTV, the MFJ-1278B supports all SSTV formats listed in table below. TVMODE(n) 1 2 3 4 5 Formats 8.
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MFJ-1278B MULTI-MODE TVX ON/OFF OPERATIONAL COMMANDS Mode: SSTV Default: OFF Parameters: ON Multi-level SSTV raw data is sent to the terminal without presetting the SSTV format. OFF Multi-level SSTV raw data is sent to the terminal in format set by the TVMODE command TVX command sets the format that the MFJ-1278B sends the SSTV pictures to the terminal. When TVX is turned ON, the SSTV picture format is not preset. The terminal program must be responsible to detect the end of the SSTV picture.
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MFJ-1278B MULTI-MODE TXDelay n OPERATIONAL COMMANDS Mode: Pactor Default: 2 (60ms) Parameters: n = Actual Delay Time equals n + 10ms * 5ms Similar to AMTOR's DELAY and packet's TXDELAY. The actual delay yielded is equal to (10ms + (TXDELAY * 5ms ) ). If the combined TXDELAYs of both stations involved in the link exceeds about 180ms, then shortpath connections may not work, particularly at longer distances. If difficulty is experienced, try using the Longpath Connect ("LC") command to connect.
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MFJ-1278B MULTI-MODE TXDIDDLE ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: OFF Parameters: ON The MFJ-1278B uses the efficent square wave TXDIDLE routine. OFF The MFJ-1278B uses flags during TXDELAY period. TXDIDDLE determines whether or not the MFJ-1278B uses a highly efficient square wave signal in place of flags during the transmitter delay (TXDELAY) period.
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MFJ-1278B MULTI-MODE TXFLOW ON/OFF OPERATIONAL COMMANDS Mode: All Default: OFF Parameters: ON Software flow control can be enabled for the MFJ-1278B in Transparent Mode. OFF Software flow control is disabled for the MFJ-1278B in Transparent Mode. If TXFLOW is ON, the setting of XFLOW is used to determine the type of flow control used in Transparent Mode. If TXFLOW is OFF, the MFJ-1278B will use only hardware flow control and all data sent to the terminal remains fully transparent.
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MFJ-1278B MULTI-MODE TXUIFRAME ON/OFF OPERATIONAL COMMANDS Mode: Packet Default: ON TXUIFRAME is used to tell the MFJ-1278B what to do with unconnected information left in its buffers. When this parameter is ON, all unconnected data are transmitted as "UI" (unconnected) frames. The TXUIFRAME command should be OFF for bulletin-board stations as it precludes the unnecessary transmission of text that occurs when the BBS user disconnects and unacknowledged packets remain.
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MFJ-1278B MULTI-MODE UNSHIFT ON/OFF OPERATIONAL COMMANDS Mode: RTTY Default: ON In Baudot RTTY receive mode only, UNSHIFT ON forces the receiver shift to the LTRS case whenever the Baudot SPACE character is received. This helps in many situations in reducing garbling when conditions are not good. Some stations, particularly those transmitting weather information and other strings of numeric text, are not compatible with unshift on space (USOS).
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MFJ-1278B MULTI-MODE VISTICKS nnnn OPERATIONAL COMMANDS Mode: SSTV Default:0 Parameters: nnnn 0
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MFJ-1278B MULTI-MODE WAitdisc nn OPERATIONAL COMMANDS Mode: Pactor Default: 20 Parameters: nn = 10<=nn<=255 The WAITDISC command determines the number of cycles the MFJ-1278B waits to reply to the other TNC, that having requested a disconnect, fails to hear our disconnect acknowledgement. WDMODE ON/OFF Mode: AMTOR Default: OFF WDMODE, word mode, determines whether a Mode A transmission takes place any time you type a SPACE or RETURN character, or only when you type a carriage return.
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MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS Parameters: ON XON/XOFF flow control is enabled. OFF XON/XOFF flow control is disabled and hardware flow control is enabled. If XFLOW is ON, the computer or terminal is assumed to respond to the MFJ-1278B Restart and Stop characters set by XON and XOFF. If XFLOW is OFF, the MFJ- 1278B will communicate flow control commands via RTS. XMITOK ON/OFF Mode: Packet Default: ON Parameters: ON Transmit functions are enabled. OFF Transmit functions are disabled.
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MFJ-1278B MULTI-MODE XOff nn OPERATIONAL COMMANDS Mode: Pactor Default: ^S Parameters: nn = 0 <= nn <= 25 This command determines the Flow Control STOP character. The Pactor XOFF command is the same as the XOFF command in the standard MFJ-1278B command set. For further information on the XOFF command please refer to the explanation of the XOFF command in Chapter 6 of the MFJ Data Controller Main Instruction Manual.
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MFJ-1278B MULTI-MODE SYSTEM MESSAGES MFJ-1278B SYSTEM MESSAGES This chapter describes the messages your MFJ-1278B may produce and the circumstances under which they can appear. PACKET MESSAGES *:J bbRAM:LOAD WITH DEFAULTS MFJ Enterprises, Inc. Model MFJ-1278B AX.25 Level 2 Version 2.0 RELEASE X.X.X - DATE - 32K RAM Checksum XXX cmd: This is the MFJ-1278B sign-on message that appears when you turn your MFJ-1278B ON or when you issue the RESET command.
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MFJ-1278B MULTI-MODE SYSTEM MESSAGES too many packets outstanding This message would appear in response to a CONVERS or TRANS command, under special circumstances. If you have previously entered packet data, filling the outgoing buffer in Converse Mode or Transparent Mode and then returned to Command Mode. You will be allowed to enter one of these modes when some of the packets have been successfully transmitted. Mailbox Messages ? Expected bank n....
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MFJ-1278B MULTI-MODE SYSTEM MESSAGES Not found This message occurs when one attempts to read or kill a non-existent message from an empty slot. For example if the user issues the command R 30 to read the message in message slot 30, and there is no message in message slot 30. None found A parameterless Kill or Read command. The NONE FOUND message occurs when the MFJ-1278B mailbox is unable to find any messages addressed to the user.
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MFJ-1278B MULTI-MODE SYSTEM MESSAGES ?not enough You did not give enough arguments for a command that expects several parameters. For example the command to initiate a beacon every 10 seconds is B E 1. If you issue the command B E the MFJ-1278B gives this message. The MFJ-1278B knows there is supposed to be another argument. ?not while connected You attempted to change MYCALL or AX25L2V2 while in a connected or connecting state.
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MFJ-1278B MULTI-MODE SYSTEM MESSAGES Link Status Messages These messages inform you of the status of AX.25 connections your MFJ-1278B may be involved in. You can always interrogate the link status by giving the CONNECT command without parameters. If you attempt a connection when your MFJ-1278B is not in the disconnected state, the MFJ-1278B will display the link status but will take no other action. The following messages appear in response to the CONNECT command.
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MFJ-1278B MULTI-MODE SYSTEM MESSAGES *** CONNECTED to: call1 [VIA call2[,call3...,call9]] This message appears when the MFJ-1278B goes from the "disconnected" or "connect in progress" state to the connected state. The connection may be a result of a CONNECT command you issued, or of a connect request packet received from another station. *** connect request:call1 [VIA call2[,call3...
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MFJ-1278B MULTI-MODE SYSTEM MESSAGES FRMR rcvd: This message is followed by a display of the FRMR packet received in the trace display format. This format is explained in the TRACE command entry. This message will not appear if your MFJ-1278B is in Transparent Mode. ***LINKOUTOFORDER, possible dataloss[opt.daytime stamp]: This message indicates failure of a CONPERMed. One or more packet nodes in the link have failed. The time of failure may be appended to this error message if the stamping mode is on.
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MFJ-1278B MULTI-MODE HARDWARE HARDWARE This chapter details the specifications and the functional description of the MFJ-1278B hardware design. MFJ-1278B SPECIFICATIONS Processor CMOS Z-80A Clocks Processor master clock input frequency: 4.9152 MHz User Port Clock: Switch selectable at 16x baud rate. Memory All memory in industry-standard JEDEC Byte-Wide sockets.
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MFJ-1278B MULTI-MODE HARDWARE bbRAM Non-volatile storage of all important operating parameters is accomplished by using a battery backed-up system for the entire 32K bytes of system RAM and all mailbox RAM. Protocol AX.25 Level 2 is supported. Pre-Version 2.0 support is compatible with earlier TAPR TNCs running 3.x software. Full support of Version 2.0 protocol is provided. Full duplex radio link operation is supported.
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MFJ-1278B MULTI-MODE HARDWARE Other integrated circuits are used for functions including clock oscillator, baud-rate generator, memory-space decoder, power supply and voltage inverter, clock recovery, transmit watch-dog timer and modem. Refer to the schematic diagram while reading the following circuit descriptions. DETAILED CIRCUIT DESCRIPTION Oscillator Components U10a, U10b, U10c, R46, R47, R48, C24, C47, C51, and crystal Y1 provide an accurate crystal-controlled oscillator for system timing.
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MFJ-1278B MULTI-MODE HARDWARE Inverter U10e buffers the radio port "16x" baud-rate signal in case it is routed, via modem disconnect J4 pins 11 and 12, to an external modem. If this buffer were not included, reflections from the distant termination might cause counter U1 to generate count errors. Counter U4b provides a properly scaled clock for the transmit NRZ to NRZI encoder (see Serial Interface, below). CPU Complex EPROM U23 provides system ROM for program storage.
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MFJ-1278B MULTI-MODE HARDWARE Watch-dog Timer Inverters U7c, U7d, U7e, and Q10 and Q20 provide a "watch- dog" timer on the transmit key line to ensure that the transmitter does not remain keyed for more than about 30 seconds should the TNC fails. This allows you to leave a station (such as a remote digipeater) on-theair and unattended without much chance of having a malfunction "lock up" the packet channel. This also helps ensure compliance with FCC regulations regarding unattended station operation.
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MFJ-1278B MULTI-MODE HARDWARE Transistors Q5 and Q6 are used to isolate the battery from the +5 volt line when main power is available. R33 protects the lithium battery from overload conditions and provides a convenient means of monitoring battery current drain when the TNC is switched off. JMP5 provides a means of disconnecting the negative side of the lithium battery for MFJ-1278B maintenance.
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MFJ-1278B MULTI-MODE HARDWARE Some serial I/O ports do not implement CTS, DTR and DSR handshaking. If these pins are not connected at the terminal end, they will be pulled up (and thus asserted) by resistors at the MFJ-1278B end. However, a non-standard serial connector may use some pins for other purposes, such as supplying power to a peripheral device, so be sure that your system either implements the CTS, DTR and DSR handshake or has no connections to these pins of J1 whatsoever.
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MFJ-1278B MULTI-MODE HARDWARE JUMPER FUNCTIONS The following table lists the function of each jumper on the MFJ-1278B. For normal operation a shorting jumper must be placed on the following connectors: JMP 5; JMP 8; JMP 9 pins 2,3; JMP 13; JMP 14 pins 1,2; JMP 16 pins 1,3 and pins 2,4; JMP 18 pins 1,2; JMP 19 outside pair (one top,one bottom); JMP 22 pins 2,3; JMP 24 pins 1,2; JMP 26 pins 1,2; JMP E, F, G, H. Also on the mode disconnect header J4 the following pins need jumpers pins 1,2 11,12 13,14 17,18.
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MFJ-1278B MULTI-MODE HARDWARE Table 8-1: Jumper Function (Cont.) Jumper # Position Function JMP16 Pin 1 & 2 Pin 1 & 3 (default) Pin 2 & 4 (default) Without multi-gray levels With multi-gray levels With multi-gray levels JMP17 Pin1 & 2 Pin 2 & 3 (default) 2400 baud ext. modem clock 9600 baud ext. modem clock JMP18 Pin 1 & 2 (default) Enable 19.2K baud termial Disable 300 baud terminal Enable 300 baud termial Disable 19.
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MFJ-1278B MULTI-MODE HARDWARE Table 8-1: Jumper Function (Cont.
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MFJ-1278B MULTI-MODE HARDWARE NOTE: * When JMP23 is shorted, it will RESET the MFJ-1278B. This means that all parameters will be reset to the default values. This is the same as removing the bbRAM battery except it is much quicker. ** MFJ offers an optional Real-time clock module (MFJ-43) that can be installed on the MFJ-1278B mother board. This clock keep the MFJ-1278B clock running all the time. You will not have to reset the clock everytime you turn the MFJ-1278B on.
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MFJ-1278B MULTI-MODE HARDWARE TTL INTERFACE PORT PIN FUNCTION,J5 The MFJ-1278B provides the user with a TTL level I/O port, J5. The TTL level I/O port, J5 is compatible with computers and terminals that do not support RS-232C serial voltage levels, such as the Commodore C64 and C128 computers. Voltage levels of 0 and 5 VDC are available at J5.
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MFJ-1278B MULTI-MODE HARDWARE MULTI-LEVEL INTERFACE CONNECTOR,J13 The MFJ-1278B provides the user with the capability to perform Multi-Level FAX operations as well as Color SSTV work. Multi-Level FAX and Color SSTV operations are accomplished through the addition of a Multi-Level Interface. The Multi-Level Interface controls both transmit and receive operations for the Multi-Level FAX and Color SSTV modes.
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MFJ-1278B MULTI-MODE HARDWARE MODEM DISCONNECT HEADER, J4 The modem disconnect header, J4, on the MFJ-1278B PC board is provided for using an external modem with the MFJ-1278B. This allows use of higher-speed modems, such as 9600 baud, or more sophisticated, higher-performance modems for OSCAR or other uses. The following information is primarily for those who wish to interface external modems to the MFJ-1278B. Familiarity with modem and serial data channel terms is assumed.
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MFJ-1278B MULTI-MODE HARDWARE Pin 5 SIO RTS Output This signal is used for transmitter activation. The SIO will pull this output low when the MFJ-1278B wants to transmit; otherwise it will remain high. This pin is normally jumpered to pin 6 when the on-board modem is used. Pin 6 Transmitter Key Input This signal is an input to the on-board modem. It activates the PTT pin of the radio connector via the watch-dog timer. It should be left high and pulled low only when transmission is desired.
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MFJ-1278B MULTI-MODE HARDWARE Pin 13 Receive Clock Input This pin is tied to the SIO receive clock input pin. It expects a clock at the desired data rate (1200 Hz for 1200 baud), of the proper phase relationship to the received data. This pin is normally jumpered to pin 14 when the on-board modem is used. Pin 14 Receive Clock Output This pin is the received data clock signal derived from the NRZI-to-NRZ state machine. This pin is normally jumpered to pin 13 when the on-board modem is used.
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MFJ-1278B MULTI-MODE TROUBLESHOOTING TROUBLESHOOTING WARNING: Never remove or insert an IC with power on! Your MFJ-1278B is a very complex piece of electronic equipment. Servicing must be approached in a logical manner. The best preparation for troubleshooting is to study the detailed hardware description in Chapter 7. While it is not possible to present all possible problems, symptoms and probable cures, this section of the manual will give you direction to troubleshooting based on our experiences.
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MFJ-1278B MULTI-MODE TROUBLESHOOTING Step 1: Power Supply The first thing to check in any malfunction is the power supply. Check the power supply levels at the outputs of the voltage regulators, Q2 and Q3 as well as the output of the inverter (U2).
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MFJ-1278B MULTI-MODE TROUBLESHOOTING Step 4: Cabling Problems Inspect the interconnection cabling. Does it work on another TNC? Has the radio and/or terminal been successfully used on packet with this or another TNC? Are all the connections tight? Has the cable frayed or broken? SPECIFIC SYMPTOMS While the steps described above may seem obvious, careful inspection often will point to the problem or give significant clues as to the probable area of the MFJ-1278B most suspect.
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MFJ-1278B MULTI-MODE TROUBLESHOOTING Verify that there is activity on the control bus READ and WRITE lines, the 3 CHIPENABLE lines on the memories (U23-25, pins 20), the IOREQ line on U21 pin 36, and the INT line on pin 16. Each of these lines should show activity, and if any line is quiet this is a sign of trouble. Logic lines that show no activity may often be traced to a short on the pc board, probably due to a solder splash or bridge.
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MFJ-1278B MULTI-MODE TROUBLESHOOTING Symptom: Uncopyable transmitted or received packets If no one seems able to decode your packet transmissions, it is often the case that your transmitter is being overdriven. The solution is to reduce the drive level via trimpots R157 and R158. Note that direct connection to typical microphone inputs requires R157 or R158 to be turned to near the minimum signal position to produce sufficiently low signal levels.
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MFJ-1278B MULTI-MODE TROUBLESHOOTING Symptom: The MFJ-1278B appears to be signing on but only gibberish is printed on the terminal eThis indicates that some combination of the data rate (baud rate), parity option, or number of start and stop bits are not set the same at the MFJ-1278B and at the terminal. If possible, set your terminal to 1200 baud. Also verify that the terminal is set for eight data bits, no parity, and 1 stop bit. These are the default settings stored in EPROM.
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MFJ-1278B MULTI-MODE PACKET RADIO PROTOCOL PACKET RADIO PROTOCOL EXPLANATION OF PROTOCOL The intention of this chapter is to give the user an overview of the packet protocol used to transmit data by the TAPR software. The MFJ-1278B employs the genuine TAPR TNC 2 packet software. We give references to more detailed information required by those wishing to implement these protocols on other hardware.
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MFJ-1278B MULTI-MODE PACKET RADIO PROTOCOL Level two accomplishes this task by partitioning data to be transferred by level one into individual frames, each with its own error detection field and frame identification fields. The MFJ-1278B supports two versions of a level-two layer, AX.25 version 1.0 and AX.25 version 2.0. Each of these protocols is based on the High-Level Data Link Control, HDLC, protocol defined by the ISO.
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MFJ-1278B MULTI-MODE PACKET RADIO PROTOCOL The communications chip recognizes the opening and closing flags and passes the address, control, and data fields, including PID to the software. The FCS field is a Frame Check Sequence computed by the transmitting chip and sent with the frame. The receiving chip recomputes the FCS based on the data received and rejects any frames in which the received FCS does not match the computed FCS. There is virtually no chance of an undetected bad frame using this method.
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MFJ-1278B MULTI-MODE PACKET RADIO PROTOCOL provided by the TRACE command. Some texts, including the AX.25 protocol specification, list the bits in the order in which they are transmitted, which is low order bit first. The AX.25 protocol presents the control bytes in hexadecimal with "x" used to indicate four bits that depend on the acknowledge functions the packet is performing. Usually "x" is a frame number.
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MFJ-1278B MULTI-MODE PACKET RADIO PROTOCOL RNR The RNR frame is used when the buffer space on the receiving side is full. REJ Used to request retransmission of frames starting from "x". Missed frames are detected by receiving a frame number different from that expected. DM Sent in response to any frame received other than a connect request (SABM) when the TNC is disconnected. Sent in response to an SABM whenever the TNC is on the air but can't connect to the requesting user, e.g.
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MFJ-1278B MULTI-MODE PACKET RADIO PROTOCOL CHANNEL USE AND TIMING FUNCTIONS The following discussions mention timing parameters which are set by various commands. These timing functions are also discussed in Chapter 5. An important part of any packet radio protocol is the means by which many stations make efficient use of an RF channel, achieving maximum throughput with minimum interference.
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MFJ-1278B MULTI-MODE PACKET RADIO PROTOCOL through the same digipeaters to the originating station. Since the digipeated packets are not acknowledged to the digipeater, an unsuccessful transmission must be retried from scratch by the originating station. In order to help alleviate the congestion of the frequency that tends to result when digipeated packets suffer collisions, the digipeater is given first shot at the frequency every time it becomes clear.
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MFJ-1278B MULTI-MODE APPENDIX A RADIO HOOKUP RADIO HOOKUP Table: A-1 HOOKUP FOR SPECIFIC RADIOS MFGS. OR RADIOS MIC. AUDIO To pin 1 of 1278B PTT To Pin 3 of 1278B RX. AUDIO To pin 4 of 1278B GROUND To pin 2 of 1278B TR-2500 4 pin 5 pin 6 pin 8 Pin HTs Pin 1 Pin 1 Pin 1 Pin 1 Tip-Lg. Speaker Speaker Speaker Speaker Tip-Sm. Pin 3,4 Pin 4,5 Pin 6 Pin 7,8 Sleeve-Sm TR-x600 HTs Ring-Lg. Tip-Sm.
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MFJ-1278B MULTI-MODE APPENDIX A RADIO HOOKUP Table A-1.2 Other Radio Connections MFGS. OR RADIOS CONNECTOR TYPE MIC. AUDIO To pin 1 of 1278B PTT To Pin 3 of 1278B RX. AUDIO To pin 4 of 1278B GROUND To pin 2 of 1278B ALINCO DR-110T DR-119T DR-570T DR-590T DJ-160T DJ-560T 8-Pin 8-Pin 8-Pin 8-Pin HT HT Pin 1 Pin 1 Pin 1 Pin 1 Small Tip Small Tip Pin 2 Pin 2 Pin 2 Pin 2 Small Tip Small Speaker Speaker Speaker Speaker Lrg. Tip Lrg.
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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION MODEM CALIBRATION The MFJ-1278B Modem is factory calibrated to operate all the operational modes it is capable of. If it becomes necessary to re-calibrate the MFJ-1278B modem, please follow the following procedure: MODULATOR/DEMODULATOR FREQUENCY CALIBRATION Here we present you with two (2) Modulator and Demodulator Calibration. Calibration Method I requires test equipment as noted, and is the most accurate.
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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION 7. Adjust R77 for 2200Hz +/- 2Hz. Press the SPACE BAR. 8. Adjust R105 for 2295Hz +/- 2Hz. Press the SPACE BAR. 9. Adjust R106 for 2125Hz +/- 2Hz. Press the SPACE BAR. 10. Adjust R122 for 2125Hz +/- 2Hz. Press the SPACE BAR. NOTE: If recalibrating the VB modem for Low Tone RTTY, then remove the jumper from JMP G, and adjust this control for 1275Hz. +/- 2Hz. 11. Adjust R119 for 2975Hz +/- 2Hz.
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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION 15. Press the SPACE BAR, the MFJ-1278B will display: Multilevel demod: 307 {154}KHz. 1550 Hz: 106 {53} At this time there will be some numbers scrolling on the computer screen. The numbers on the screen will vary from 103 to 110. 16. Press the SPACE BAR, the MFJ-1278B will display: 2250 Hz: 70 {35} NOTE: This may take a few seconds to appear due to the sampling rate of the MFJ-1278B. The numbers on the screen again will vary from 65 to 75. 17.
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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION NOTE: If recalibrating the VB modem for Low Tone RTTY, then remove the jumpers from JMP E, F, G, and H and tune R114 until the 10th LED from the left is lit. 26. Press the SPACE BAR. The MFJ-1278B will display the CMD: prompt. This indicates the completion of the MFJ-1278B MODULATOR and DEMODULATOR CALIBRATION.
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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION Comprehensive Alignment Procedure It is important that the tuning indicator alignment be optimized for the 300 baud 200 Hz shift HF packet modem. It will indicate correctly for all other modes when aligned for the HF packet modem. As described elsewhere in this manual, the exact configuration of your radio's filters and whether it has IF shift or not will determine the exact required center frequency for the modem.
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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION 8. Adjust R106 carefully until both the "CON" and "STA" LEDs on the front panel of the TNC are lit. One of the leds may filcker slightly. This is normal. 9. Type a "Q". This exits the MFJ-1278B from calibrate mode to command mode. 10. Type CALSET n ". Where n is a number determined by: n = INT [ 525000 / F(high) ] + 1 11. Command the MFJ-1278B into calibrate mode by typing "CAL ". 12. Command the MFJ-1278B to key the modem by typing "K". 13.
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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION 5. Command the MFJ-1278B to do a demodulator calibration by typing "RXCAL ". 6. CAREFULLY adjust R113 until the DCD LED on the front panel is fully illuminated. NOTE: The threshold control on the MFJ-1278B must be set to a position which will allow the DCD circuit to function properly. A setting approximately 1/3 to 1/2 of the total range starting from maximum CCW should be adequate.
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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION 3. Command the calibration routine to send 50 percent duty cycle square wave data from the modulator by typing "RXCAL" . 4. While observing the LEDs in the tuning indicator, adjust R212 in the tuning indicator area so that either the 10th or 11th led from the left (or both) are illuminated. 5. Return the MFJ-1278B to command mode by typing "Q". 6. Remove jumpers at JMP 4 and JMP 7. This completes the tuning indicator alignment.
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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION MFJ-1278B Adjustment Location Map This is a map of the physical locations of the adjustment potentiometers on the MFJ-1278B circuit board. They are shown as they appear when looking down on top of the board with the board oriented so that the rear panel connectors are to the left. Information in the boxes is organized as shown below. NOTE: Separate procedure required to do alignment of CW demodulator center frequency.
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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION Calset Values for Various Modulator Tone Frequencies Tone 2125 CALSET # 247 Adjust R106 Modem / Remarks HF Packet & RTTY Fc = 2200 Hz 170 Hz shift 2295 229 R105 1300 404 R78 2100 250 R77 1200 438 R78 2200 240 R77 2125 248 R122 2975 177 R119 VHF RTTY Fc = 2550 Hz 850 Hz shift 750 775 800 825 700 1500 701 678 657 637 751 351 R139 R139 R139 R139 R139 R138 CW CW CW CW CW / SSTV SSTV 2178 2263 242 233 R122 R119 HF RTTY/ASCII/AMT
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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION CW MODEM TUNE-UP PROCEDURE The CW modem in the MFJ-1278B is fundamentally different from the other modems. It is NOT an AFSK modem. It sends and receives only 1 tone. For this reason, it requires a different alignment procedure than the others. NOTE: If the Modulator and Demodulator are not EXACTLY on the same frequency for BOTH stations involved in VHF FM MCW operations, the CW receive functionality becomes degraded if not eliminated.
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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION Detailed CW Demodulator Alignment Procedure 1. Determine the required Fc for the demodulator. If the radio has a narrow filter for CW, one of the 2 methods presented on Pages 19 and 20 in the appendix of this manual should be used to determine the filter center frequency. This frequency should be used for Fc. If the radio has no narrow CW filter, use the CW carrier offset frequency of the radio.
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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION b. Place a scope probe on the top pin of JMP10, the pin furthest from Q14). The oscilloscope will be used to indicate when the square wave that will appear at this point during the adjustment procedure approaches 50 percent duty cycle. c. Command the TNC into calibrate mode by typing "CAL ". d. Command the TNC to key the modem by typing "K". e.
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MFJ-1278B MULTI-MODE APPENDIX B MODEM CALIBRATION NOTE: If you have a square wave on the scope face but the tuning indicator is not near center, you are on a false setting. Adjust R115 so that the tuning indicator is near center and THEN set the square wave duty cycle. 4. If MCW transceive operation with another station is desired, do the above procedure to BOTH MFJ-1278s using an agreed upon frequency for Fc. Then leave the modulator tone on the agreed on frequency with the demodulator Fc. 5.
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MFJ-1278B MULTI-MODE APPENDIX C AUDIO OUTPUT AUDIO OUTPUT CALIBRATION The transmit audio output levels of MFJ-1278B Radio Port 1 and Radio Port 2 both are factory set to 250 mV. You may find it necessary to set the output levels differently to match your radio specifications, then you should follow the procedure given in this appendix. Note that the user can set the audio levels of both Radio Ports independently. Adjust R157 for Radio Port 1 and R158 for Radio Port 2.
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MFJ-1278B MULTI-MODE APPENDIX C AUDIO OUTPUT 8. Move the probe to J9 pin 4, RX audio. The signal should be approximately 1 V p-p. 9. Press the space bar and again measure the peak to peak voltage at J9 pin 4. The audio level should not change. Both mark and space audio should be at the same level. 10. Type: Q the cmd: prompt will appear on the computer screen. 11. Switch the MFJ-1278B to Radio Port 2 by typing: RADIO 2 The MFJ-1278B will respond with: cmd: 12.
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MFJ-1278B MULTI-MODE APPENDIX D HF RADIO HF RADIO ALIGNMENT If you have determined that it is necessary to realign the MFJ-1278B modem center frequency to your radio filter center frequency, one of the following 2 methods should be used to make the radio filter center frequency (Fc) determination. Both methods require access to a frequency counter capable of measuring audio frequencies to a resolution of 1 Hz. Almost any frequency counter should be capable of this.
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MFJ-1278B MULTI-MODE APPENDIX D HF RADIO SECOND METHOD: FILTER SKIRT AVERAGE FREQUENCY 1. Set the receiver to LSB mode with the 500 Hz filter selected. 2. Make sure the radio's IF shift control, if one is present, is in its proper position (centered or on detente). 3. Using either a signal generator or a stable, relatively strong carrier from an AM broadcast transmission (preferably ground wave signal), tune the receiver so that the carrier falls near the center of the filter passband.
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MFJ-1278B MULTI-MODE APPENDIX E CONVERTING TO TNC-2 CONVERTING THE MFJ-1278B TO "LIKE-TNC 2" With a simple modification as described in this section, APPENDIX E, the user can easily convert the MFJ-1278B to a "like TNC 2" controller. Once converted, the MFJ-1278B can run programs such as NET/ROM™ , THE NET™ and other special firmware that have been developed for the TNC 2. The modification described below sets the MFJ-1278B into a "like" TNC 2 mode.
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MFJ-1278B MULTI-MODE APPENDIX E CONVERTING TO TNC-2 3. Construct Header U28 by connecting pins 2, 5, 6, 12, 15 and 19 to ground pin 10. Connect pins 9 and 16 to +5 Volts at pin 20. See Figure E-2 below. Fig. E-2: Header U28 4. Remove U27 on the MFJ-1278B PC board and replace it with Header U27. 5. Remove U28 on the MFJ-1278B PC board and replace it with Header U28. 6. Set the terminal program parameters as specified by the NET/ROM documentation.
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MFJ-1278B MULTI-MODE APPENDIX F 2400 BPS PACKET MFJ-1278B 2400 BPS PACKET If your MFJ-1278B does not have the 2400 bps packet capability, then the user can easily install the proper hardware. The user can purchase the optional MFJ-2400 BPS modem, and is easily installed. Installation is simple, because your MFJ-1278B is equipped with all the appropriate connectors necessary to make this installation quick and easy without modifications or soldering.
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MFJ-1278B MULTI-MODE APPENDIX F 2400 BPS PACKET 2400 BPS Receive Audio Setting The MFJ 2400 modem employs automatic gain control (AGC) for its receive audio. The receive audio level is pre-set for proper 2400 operation, and no adjustment is necessary in most cases. If you set the receive audio of your radio properly for 1200 operation, then in most cases will be suitable for the 2400 operation also. No adjustment for the receiver audio on the 2400 modem board is needed.
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MFJ-1278B MULTI-MODE APPENDIX G: JUMPER FUNCTIONS JUMPER FUNCTIONS AND LOCATIONS The MFJ-1278B mother board has many jumper connectors. Each jumper connector has a special function. The Jumper Function chart, Table G-1 in this appendix, will help in identifying each jumper function. Figure G-1 will help in locating the jumper connectors easily.
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MFJ-1278B MULTI-MODE APPENDIX G: JUMPER FUNCTIONS Table G-1: Jumper Function (Cont.) Jumper # Position Function JMP18 Pin 1 & 2 (default) Enable 19.2K baud termial Disable 300 baud terminal Enable 300 baud termial Disable 19.
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MFJ-1278B MULTI-MODE APPENDIX G: JUMPER FUNCTIONS Table G-1: Jumper Function (Cont.
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MFJ-1278B MULTI-MODE APPENDIX G: JUMPER FUNCTIONS Fig.
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MFJ-1278B MULTI-MODE APPENDIX H COMMAND SUMMARY COMMAND SUMMARY Command Default Mode Function Page 8BITCONV Paramete r ON|OFF off Packet 6-5 8LEVELS ON|OFF off FAX/SSTV 16LEVELS ON|OFF on FAX/SSTV AALT ON|OFF off AMTOR ABORT -- I-command M-Packet ACKPRIORITY ON|OFF on Packet ACKTIME n 14 Packet ALOCKCHAR nn $15 (^U) CW/MCW ALTCALL ssss blank AMTOR ANSBSTR cccc blank AMTOR ANSWRQRA ON|OFF on Packet ARCVCHAR nn $12 (^R) RTTY/CW/ ARQ ASA ssss -- I-comman
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MFJ-1278B MULTI-MODE APPENDIX H COMMAND SUMMARY Command Default Mode Function Page BKONDEL Paramete r ON|OFF on Packet 6-19 BLP BTEXT BUDLIST ON|OFF text ON|OFF on blank off Packet Packet Packet BUF n 0-9 CW/RTTY/ BUFKEY nnn 9 CW/RTTY/ BUFTIME n 0 CW BWNL ON|OFF off AMTOR CALIBRA -- I-command All CALSET n 0 All CANLINE n $18 (^x) Packet CANPAC n $19 (^Y) Packet CBELL ON|OFF off Packet CBell ON/OFF OFF Pactor CCITT ON|OFF on RTTY CHANGE - I-command
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MFJ-1278B MULTI-MODE APPENDIX H COMMAND SUMMARY Command Default Mode Function Page CONPERM Paramete r ON|OFF off Packet 6-32 CMSG ON|OFF off Packet CMSGDISC ON|OFF off Packet COMMAND n $03 (^C) All CONMODE C|T C Packet CONNECT C1|Cx none Packet CONOK ON|OFF on Packet CONSTAMP ON|OFF off Packet CONVERS -- I-command All CONVERSE -- I-command AMTOR CPACTIME ON|OFF off Packet CR ON|OFF on Packet CTEXT text blank Packet CSTATUS -- I-command Packet CW
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MFJ-1278B MULTI-MODE APPENDIX H COMMAND SUMMARY Command Default Mode Function Page DEADTIME Paramete r nnn 33(330Ms) Packet 6-46 DELAY nn 20 (20Ms) AMTOR DELETE DEFLTDLC DIDDLE ON|OFF 0-254 ON|OFF off 254 on Packet Host ASCII/ DIGIPEAT ON|OFF on Packet DISCONNE -- I-command Packet DISPLAY -- class Packet DISPLAY -- I-command AMTOR DWAIT EAa n ON/OFF 33 on Packet Pactor EAS ON|OFF off CW/RTTY/ASCII EASIN ON/OFF off Amtor ECHO ON|OFF on All ECho ON/OFF on
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MFJ-1278B MULTI-MODE APPENDIX H COMMAND SUMMARY Command Default Mode Function Page FEC Paramete r -- I-command AMTOR 6-58 FIRMRNR ON|OFF on Packet FLOW FLow ON|OFF ON/OFF on on Packet Pactor FORWARD FRACK FULLDUP GRAPHLF -n ON|OFF ON|OFF I-command 3 off off Packet Mailbox Packet Packet FAX/SSTV HEADERLN ON|OFF off Packet HEALLED ON|OFF off Packet HID ON|OFF off Packet ID -- I-command AMTOR ID -- I-command Packet Id IDTime -nnn I-command 590 Pactor Pactor K ---
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MFJ-1278B MULTI-MODE APPENDIX H COMMAND SUMMARY Command Default Mode Function Page LFADDALT Paramete r ON|OFF on RTTY 6-67 LFIGNORE ON|OFF off Packet LISTEN -- I-command AMTOR MAILbox MAILBOX MAILLED ON/OFF ON|OFF ON|OFF off on on Pactor Packet Packet MALL ON|OFF on Packet MARSMODE n 0 RTTY/ASCII MATCH ON|OFF on AMTOR MAXFRAME n 4 Packet MAXSum nn 30 Pactor MAXUp nnn 10 Pactor MBEGIN cccc <<>> AMTOR MCOM ON|OFF off Packet MCON ON|OFF off Packet MCTE
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MFJ-1278B MULTI-MODE APPENDIX H COMMAND SUMMARY Command Default Mode Function Page MRPT Paramete r ON|OFF on Packet 6-80 MSPEED nn 20 CW MSTAMP ON|OFF off Packet MTIMEOUT 0-250 30 M-Packet MULTIFAX ON|OFF off FAX MYCALL MYcall MYALIAS call callsign call-n nocall MFJPACTR blank Packet Pactor Packet MYDLCNUM MYHIERAD 0-254 nnnn 0 text Host M-Packet MYMCALL MYSELCAL call ssss nocall blank M-Packet AMTOR NAVTEX NAVSTN -xxxxx I-command all NAVTEX NAVTEX NAVMSG x all
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MFJ-1278B MULTI-MODE APPENDIX H COMMAND SUMMARY Command Default Mode Function PACTIME Paramete r n10 Packet 6-92 PARITY n 0 Determines the length of time between transmit and receive.
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MFJ-1278B MULTI-MODE APPENDIX H COMMAND SUMMARY Command Default Mode Function Page RETries RETRY Paramete r nnn n I-command 10 Pactor Packet 6-104 6-104 REVFLIM call-n blank M-Packet RFE ON|OFF off AMTOR RINV ON|OFF off AMTOR RXBLOCK ON|OFF off Packet RXBRIGHT n 4 SSTV/FAX RXCAL -- I-command All RVFALWAY ON|OFF on M-Packet RXINVERT SCREENLN SELCALL SENDPAC ON|OFF n ssss n off 0 I-command $0D (CR) RTTY/ASCII All AMTOR Packet SERIALNO SETUP 0-65535 n 0 I-command C
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MFJ-1278B MULTI-MODE APPENDIX H COMMAND SUMMARY Command Default Mode Function Page STREAMSW Paramete r n $7C (|) Packet 6-118 SYSOP -- I-command Packet TIMEDCMD text blank M-Packet TIMEDMIN TINV n ON|OFF 60 off M-Packet AMTOR TRACE TRace ON|OFF ON/OFF off OFF Packet Pactor TRANS TRFLOW -ON|OFF I-command off Packet Packet TRIES nn one Packet TUNE -- I-command All TUNEPROC -- I-command All TVBREAKS n see 6-122 SSTV TVHSYNC ON|OFF off SSTV TVMODE TVX n ON|OFF
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MFJ-1278B MULTI-MODE APPENDIX H COMMAND SUMMARY Command Default Mode Function Page TXUIFRAME Paramete r ON|OFF on Packet 6-129 U1 Unproto U2 Unproto UNPROTO --call1 I-command I-command CQ Pactor Pactor Packet UNSHIFT ON|OFF on RTTY/ASCII URepeats nn 1 Pactor USERS n 1 Packet VISTICKS n 0 Color SSTV VISBREAKS n see 6-132 Color SSTV VISTONES n see 6-132 Color SSTV WAitdisc nn 20 Pactor WDMODE ON|OFF off AMTOR WEIGHT n 0 CW WRU -- I-command AMTOR XFLOW XMI
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MFJ-1278B MULTI-MODE APPENDIX I PARTS LIST MFJ-1278B/1278BT PARTS LIST MFJ P/N Descrpition Component ID RESISTORS, 1/4 WATT, 5% 100-0002 10 OHM R128, R150 100-0003 100 OHM **R14, **R15, R17, R18 R19, R59 100-0004 200 OHM R60, R126 100-0009 470 OHM R4, R97, R53, R34, R35 100-0056 680 OHM R211 100-0010 1K R8, R36, R46, R47, R48 R11, R33, R144, R143, R56 100-0012 2.2 K R16, R145, R146 100-0099 4.3 K R152 100-0014 4.
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MFJ-1278B MULTI-MODE APPENDIX I PARTS LIST R27, R37, R42 R72, R43 R20, R31, R64, R65, R133 R147 R155, R40, R41 100-0060 180 K R154 100-0033 200 K R205 100-0073 470 K R203, R204 100-0063 750 K R95 100-0040 1M R83 RESISTORS, 1/8 WATT, 1% 102-5301 301 K R129 102-0057 182 K R102 102-5229 229 K R118* 102-4392 39.2 K R116, R141 102-0026 13.3 K R111, R117* 102-4180 18 K R120* 102-0052 16.2 K R112 102-4150 15.0 K R123 102-0018 10.00 K R82, R81, R121* 102-0053 22.
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MFJ-1278B MULTI-MODE MFJ P/N Descrpition APPENDIX I PARTS LIST Component ID TRIMPOTS, BOURNS OR EQUAL 108-6014 10 K, BOURNS 3299W-1-103 R79, R113, R114 108-7005 20 K, BOURNS 3299W-1-203 R77, R78, R106, R105, 108-7006 50 K, BOURNS 3299W-1-503 R115, R138, R139, R122 108-7008 25 K, BOURS 3299W-1-253 R119 108-7001 1 K, BOURNS 3299W-1-102 R212 TRIM POT: SINGLE TURN, MINIATURE 104-1103 10 K, Single-turn Trimmer R157, R158, R160 POT: 17MM SINGLE TURN, PCB MOUNT 104-3104 100 K LINEAR TAPER,
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MFJ-1278B MULTI-MODE APPENDIX I PARTS LIST MFJ P/N Descrpition Component ID 201-1210 .1 UF, Z5U, 20% C1, C4, C11, C32, C21, C23 C9, C13, C14, C25, C26 C15, C17, C27, C28, C29 C30, C49, C50, C37, C38 C40, C41, C78, C43, C46 C48, C63, C66, C202, C205 C206, C208, C209, C91* C70*, C92*, C94*, C95* R93*, C33* CAPACITORS: MYLAR, 50V/100V 201-0018 .01 UF, MYLAR, 5% C64#, C68#, C90# 201-0006 .022 UF, MYLAR, 5% C55, C52 201-0001 .15 UF, MYLAR, 10% C45 201-2247 .
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MFJ-1278B MULTI-MODE MFJ P/N Descrpition APPENDIX I PARTS LIST Component ID CAPACITOR: OTHER TYPES 203-8010 1 UF, 16 V, RADIAL TANTALUM TYPE C20 204-0060 60 PF, TRIMMER (2 LEADS, .
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MFJ-1278B MULTI-MODE APPENDIX I PARTS LIST MFJ P/N Descrpition Component ID 312-2512 27C1001, CMOS EPROM, 100 NS OR BETTER, (ERASABLE TYPE ONLY, DO NOT USE FUJUTSE TYPE) U23 312-2081 27C64, CMOS EPROM, 200 NS OR BETTER, PROGRAM WITH "STATE" 1.
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MFJ-1278B MULTI-MODE APPENDIX I PARTS LIST MFJ P/N Descrpition Component ID 310-3138 74HC138, 3-to-8 LINE DECODER U29#, U12# 310-0054 4053B, TRIPLE 2-CH CMOS ANALOG SWITCH U26, U35, U36 310-0053 4052B, DIFFERENTIAL 4-CH CMOS ANALOG SWITCH U32, U33, U34 310-0040 4066, QUAD CMOS SWITCH U30, U31 310-3021 74HCT21, DUAL 4-INPUT AND U41* 310-3273 74HCT273, QUAD D FLIP FLOP U40 301-0012 1N754, 6.
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MFJ-1278B MULTI-MODE APPENDIX I PARTS LIST MFJ P/N Descrpition Component ID 305-0001 2N3904, GENERAL PURPOSE NPN Q9, Q1, Q2, Q4, Q6, Q7 Q22, Q15, Q13,Q14, Q16 Q19 305-0002 2N3906, GENERAL PURPOSE PNP Q8, Q5, Q12, Q21, Q23 305-2006 MPS-A92 Q18 VOLTAGE REGULATOR 307-2006 7805CT, TO-220, +5 VOLTS Q3 612-1010 10-PIN, .1 CENTER, RIGHT ANGLE MALE HEADER, 22-05-3181 J5# 612-0032 2-PIN, .
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MFJ-1278B MULTI-MODE APPENDIX I PARTS LIST MFJ P/N Descrpition Component ID 601-6021 2.0 MM PIN, COAXIAL JACK, PC MOUNT, MALE P1 601-5003 3.
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MFJ-1278B MULTI-MODE APPENDIX I PARTS LIST MFJ P/N Descrpition 715-8082 6-32 x .5" Hex or round Aluminum spacer threaded with 6-32 threaded on both ends. To be installed on mother board. Use mounting hole next to C201 and C203. 700-3063 6-32 x .25" machine screw. For installing above spacer. 705-1617 MOUNTING NUT FOR R131 710-4017 PANEL WASHER FOR R131 701-7163 M3 X 6, SCREW FOR MOUNTING PCB TO CHASSIC & REGULATOR TO CHASSIS.
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MFJ-1278B MULTI-MODE MFJ P/N Descrpition 806-0210-1278 CABINET COVER. APPENDIX I PARTS LIST Component ID NOTE: MASK OUT PAINT ON THE INSIDE OF THE TOP CHASSIS PIECE. THIS IS TO INSURE GOOD CONTACT WITH CHASSIS REDUCE EMI. 770-1162 STICK-ON RUBBER FEET 781-2110 FCC STICKER, INSTALL UNDER CHASSIS 781-1118 SERIAL NO. STICKER. INSTALL ONE UNDER CHASSIC AND ONE ON OUTSIDE OF GIFT BOX.
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MFJ-1278B MULTI-MODE APPENDIX I PARTS LIST MFJ P/N Descrpition Component ID 205-1210 .1 UF, Z5U, 20% MONOLITHIC CAPACITOR C209 625-0182 18-PIN IC SOCKET U204, U205 625-0291 20-PIN IC SOCKET U202, U203 311-1056 LM3914N, BAR GRAPH DISPLAY DRIVER U204, U205 320-2010 MV57164, 10 SEG. BAR GRAPH. DISPLAY, RED, GI OR LTA-1000P OR EQUAL U202, U203 861-1274-2 PC BOARD FOR 50-1274-2 620-6108 8-COND.
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MFJ-1278B MULTI-MODE MFJ P/N Descrpition APPENDIX I PARTS LIST Component ID Capacitor: Monolithic Ceramic 205-1210 .
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MFJ-1278B MULTI-MODE MFJ P/N Descrpition APPENDIX I PARTS LIST Component ID BOM for 2400 Baud Modem PC Assembly: P/N: 50-2400B-1 (For 1278T only) RESISTOR, 1/4 WATT, 5% 100-0009 470 OHM R5 100-0065 620 OHM R48 100-0010 1K R49 100-0012 2.2 K R29 100-0046 2.7 K R19 100-0014 4.7 K R3, R50 100-0015 7.5 K R43 100-0050 8.
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MFJ-1278B MULTI-MODE APPENDIX I PARTS LIST MFJ P/N Descrpition Component ID 100-0042 1.8 M R53 100-0087 3.9 M R52 RESISTOR, 1/8 WATT, 1% 102-0037 9.09 K R21, R22 102-0038 9.53 K R12, R15 RESISTOR, NETWORK, SINGLE-ON-LINE, ISOLATED 107-6104 100 K RP2 RESISTOR, TRIM POT, SINGLE TURN, MINIATURE, HORZONTAL 104-4008 1M R38 CAPACITORS: DISC CERAMIC 200-0020 33 PF, 50V, 20% C8, C9 CAPACITORS: MULTI-LAYER, MONOLITHIC CERAMIC 205-1047 .0047 UF, X7R, 10%, 50V C1, C2, C13 205-1122 .
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MFJ-1278B MULTI-MODE MFJ P/N APPENDIX I PARTS LIST Descrpition Component ID 300-0003 1N4148 D1, D4 300-8001 1N34A D6 DIODES: TRANSISTORS: 305-0001 2N3904 T2, T5, T6 305-0003 2N5088 T1 305-6005 VN10KM T3 311-2049 XR2123ACP, PSK MODEM IC7 311-0001 741CN, SINGLE OP-AMP IC10 311-2069 MF10CCN, DUAL ACTIVE FILTER IC3, IC4 310-3157 74HC157P, QUAD 2-IN MULTIPLEXER IC9 310-0010 4024B, 7 STAGE BINARY COUNTER IC6 310-3004 74HC04, HEX INVERTER IC8 310-4193 74HCT193, UP/DOWN COUNT
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MFJ-1278B MULTI-MODE MFJ P/N Descrpition 625-0292 28 PIN APPENDIX I PARTS LIST Component ID MISCELLANEOUS: 405-0095 CRYSTAL, HC18/U, 4.608 MHZ Y1 612-1021 .1 CENTER, RIGHT ANGLE, 5 POS. HEADER JMP 14B 612-3210 .1 CENTER, TOP ENTRY,10 POS DUAL ROW SOCKET CONNECTOR CN1 612-0033 .1 CENTER, 3 POS. HEADER CN 6 612-4001 2-POS. SHORTING JUMER FOR CN6 862-2400B PCB, FOR 50-2400B-1 APPROX. 4" X 3.
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MFJ-1278B MULTI-MODE MANUAL INDEX Manual Index * *.
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MFJ-1278B MULTI-MODE Automatic operations, transmit operation, 128, 305 AUTOTRAC, 72 AWLEN, 278 Awlen, 34 AX.
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MFJ-1278B MULTI-MODE Clock, NRZ to NRZI encoder, 318 Clock, speed selection, 317 Collision, avoidance, 231, 275, 343 Collision, detection, 343 Command abbreviations, 173 Command Defaults, 173 Command list, format, 173 Command Mode, 32 Command Mode entry character, Transparent Mode, 203 Command Mode, transmission, 262 Command Mode, automatic entry, 121, 261 Command Mode, display output cancellation, 198 Command Mode, echos, 226 Command Mode, entry from Converse Mode, 43, 121, 206 Command Mode, entry
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MFJ-1278B MULTI-MODE Commands, AUTOLF, 185 Commands, AUtolf, 185 Commands, AUTOTRAC, 186 Commands, AWLEN, 176, 187 Commands, AX25L2V2, 187, 201 Commands, AXDELAY, 52, 188 Commands, AXHANG, 52, 188 commands, basic, 32 Commands, BBSMSGS, 189 Commands, BEACON, 193 Commands, BEACON EVERY/AFTER, 190 commands, BKONDEL, 49 Commands, BLP, 192 Commands, BTEXT, 190, 311 Commands, BUDLIST, 237 Commands, BUF, 194 Commands, BUFKEY, 195 Commands, BUFTIME, 195 Commands, BWNL, 195 Commands, CALIBRA, 196 Commands, CALSET,
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MFJ-1278B MULTI-MODE Commands, CWIDMODE, 214 Commands, CWSENDCH, 215 Commands, CWSPEEDM, 215 Commands, DAYTIME, 210, 216, 249, 253, 310 Commands, DAYUSA, 210, 217, 253 Commands, DDisc, 217 Commands, DEADTIME, 218 Commands, DEFLTDLC, 219 Commands, DELAY, 218 Commands, DELETE, 219 commands, DELETE, 49 Commands, DIDDLE, 219 Commands, DIGIPEAT, 220 Commands, DISCONNE, 220 commands, DISCONNE, 43 Commands, Disconnect, 217 Commands, DISPLAY, 198, 217, 224 Commands, DISPlay, 221 Commands, DWAIT, 52, 224 Commands,
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MFJ-1278B MULTI-MODE Commands, ID, 234, 235 Commands, Id, 234 Commands, IDTIME, 235 Commands, K (Converse), 235 Commands, KILONFWD, 235 Commands, KISS, 236 Commands, LC, 237 Commands, LCALLS, 194, 237 Commands, LCSTREAM, 238 Commands, LEDmode, 239 Commands, LFADD, 239 Commands, LFadd, 239 Commands, LFADDALT, 239 Commands, LFIGNORE, 240 Commands, LISTEN, 240 Commands, MAILBOX, 241, 290 Commands, MAILbox, 240 Commands, MAILLED, 242 Commands, MALL, 243 Commands, MARSMODE, 244 Commands, MATCH, 245 Commands, MA
PAGE 394
MFJ-1278B MULTI-MODE Commands, MYcall, 255 Commands, MYDLCNUM, 255 Commands, MYHIERAD, 256 Commands, MYMCALL, 256 Commands, MYSELCAL, 256 Commands, NAVMSG, 258 Commands, NAVSTN, 257 Commands, NAVTEX, 257 Commands, NEWMODE, 207, 259 Commands, NODEFORW, 260 Commands, NODEPATH, 261 Commands, NOMODE, 261 Commands, NUCR, 262 Commands, NULF, 262 Commands, NULLS, 262 Commands, OK, 263 Commands, OMLC, 263 Commands, PACLEN, 245, 263 Commands, PACTIME, 211, 264 Commands, PARITY, 264 Commands, PASS, 50, 193, 265 Comm
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MFJ-1278B MULTI-MODE Commands, RVFALWAY, 282 Commands, RXBLOCK, 278 Commands, RXBRIGHT, 279 Commands, RXCAL, 280 Commands, RXINVERT, 282 Commands, SCREENLN, 282 Commands, SELCALL, 283 Commands, SENDPAC, 283 Commands, SERIALNO, 283 Commands, SETUP, 284 Commands, SFNL, 284 Commands, SLOTS, 285 Commands, SOLF, 285 Commands, SRXALL, 286 Commands, START, 50, 286 Commands, STATUS, 287 Commands, STAtus, 286 Commands, STOP, 50, 287 Commands, STREAMCA, 288 Commands, STREAMDB, 289 Commands, STREAMSW, 290 Commands, T
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MFJ-1278B MULTI-MODE Commands, UNPROTO, 190 Commands, UNSHIFT, 302 Commands, URepeats, 302 Commands, USERS, 302 Commands, VISBREAK, 303 Commands, VISTICKS, 303 Commands, VISTONES, 303 Commands, WAitdisc, 304 Commands, WDMODE, 304 Commands, WEIGHT, 304 Commands, WRU, 305 Commands, XFLOW, 305 Commands, XMITOK, 305 Commands, XOff, 306 Commands, XON, 306 Commands, XOn, 306 Commands.
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MFJ-1278B MULTI-MODE Converse Mode, entry from Command Mode, 119, 210, 259, 309 Converse Mode, escape to Command Mode, 43, 206 Converse Mode, flow control to computer, 306, 307 Converse Mode, line cancellation, 197 Converse Mode, packet cancellation, 198 Converse Mode, send-packet character, 283 Converse Mode, special characters, 122 CRC checksum, disregarding, 266 CW KEY-IN, 71 CW, operation of, 71 CWSEndch, 73 CWSPEEDM, 73 D Data Carrier Detect, 52 Data Communications Equipment, 9, 321 Data loss, 262 Da
PAGE 398
MFJ-1278B MULTI-MODE Diodes, incorrect installation, 332 DIP header, U15, 319 DISC frames, 342 DISC frames, monitored, 247 Disconnect, acknowledged by UA frames, 342 Disconnect, after exceeding re4ry count, 276 Disconnect, causes, 312 Disconnect, in progress, 312 Disconnect, initiating a request, 220 Disconnect, message, 313 Disconnect, sent as DISC frames, 342 DISPLAY, 46 Display features, translation, 227 Display features, transmission, 262 Display features, cancel output, 198 Display fea
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MFJ-1278B MULTI-MODE MANUAL INDEX F FARnswor, 73, 75 FARNSWORTH CW, 75 FCS\, HDLC field, 338 Fig. 2-1. Serial port wiring for Apple Macintosh., 6 Fig. 2-2. Serial port wiring for Radio Shack, 9 Fig. 2-3.
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MFJ-1278B MULTI-MODE I I frames, 340 IBM PCjr, 8 IBM PCjr, serial port interfacing, 8 IBM PCjr, terminal program, 12 IBM Personal Computer, 6 Identification packets, 234 Identification, automatic, 128 Identification, station, 127 iming, frame-acknowledge time for digipeated packets, 132 Input Editing, character deletion, 49 Input editing, character deletion, 49, 219 Input editing, disabled in Transparent Mode, 293 Input editing, line cancellation, 50, 197 Input editing, packet cancellation, 121, 198 Input
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MFJ-1278B MULTI-MODE L LED normal power-up display, 333 Line Spacing, packet text, 130 Line wrapping, 35, 282 Link status messages, 312 Logic lines, troubleshooting, 334 Lower case characters, translation to upper case, 238 M Macintosh, serial port interfacing, 6 Macintosh, terminal program, 11 memory buffers, 38 memory buffers, chaining, 40 memory buffers, loading of, 39 memory buffers, numbering of, 39 memory buffers, transmitting of, 39 Memory Keyer, 71 Memory space decoder, 317, 318 Messages, error, 3
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MFJ-1278B MULTI-MODE Monitoring, selected stations, 137 Monitoring, time stamping, 253 Monitoring, while connected, 46, 247 MSPeed, 73 Multiple packets, for 1200 baud, 134 N NEC 8201, serial port interfacing, 9 NEC 8201, terminal program, 13 New lines, 35 Noise, cause of retransmissions, 45 NORMAL CW, 75 NRZ to NRZI encoder, 318 NRZ to NRZI encoder, clock, 318 NRZI encoding, 339 Null modem cable, 321 O Operating modes, 316 Operation, Packet, VHF, 127 OSCAR operation, 328 OSCAR operation, full duplex, 232
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MFJ-1278B MULTI-MODE Power supply, troubleshooting, 332 Power-on reset, 319 Power-on reset, LED display, 333 Protocol, 337 Protocol errors, result in FRMR frames, 342 Protocol, AX.
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MFJ-1278B MULTI-MODE RS-232C, 4 RS-232C signals, Clear To Send, 15, 125 RS-232C signals, Data Carrier Detect, 15 RS-232C signals, Data Set Ready, 15 RS-232C signals, Data Terminal Ready, 125 RS-232C signals, Frame Ground, 13 RS-232C signals, Request to Send, 15 RS-232C signals, Signal Ground, 15 RS-232C signals, Transmit Data, 13 RS-232C, baud rate, 17 RS-232C, handshaking, 320 RS-232C, negative power supply, 320 RS-232C, signal levels, 10 RS-232C, signals, 13 RS-232C, troubleshooting, 335 S SABM frames,
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MFJ-1278B MULTI-MODE signal lock, 72 SLOTTING, 153 Software UART, Color Computer, 13 Special Characters, 117 Special characters, Converse Mode, 122 Special characters, Transparent Mode, 122 special input characters, 49 Specifications, 315 State machine, 318 Station identification, 234 Station identification, callsign text, 254 Station identification, sent as UI frames, 339 Stations heard, clearing list, 249 Stations heard, displaying list, 249 Stopping output, 50 SW2\, baud rate selection, 317 T Table 2-3.
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MFJ-1278B MULTI-MODE Timing, Transparent Mode escape, 203 TNC 1, AX.