X1k TABLE OF CONTENTS SPECIFICATIONS oL 2 DESCRIPTION INSTALLATION Counterfoil 4 CONTROL FUNCTIONS. OPERATION INSIDE VIEW TROUBLE SHOOTING . .o oy 23 VOLTAGE CHARTS. BLOCK DIAGRAM P.C. BOARD SEPARATE SCHEMATIC DIAGRAM.
SECTION 1l DESCRIPTION 144MHz FM TRANSCEIVER INCORPORATING A MICROCOMPUTER CPU control with: ICBM's original programs provides various :operating capabilities: Frequency control, band-edge detection, and ‘the display. are accomplished by the ‘microcomputer. The B-channel memory is: controlled: electrically by the use of 4 256-bit RAM area. The circuits for these IC:255E functions are equivalent in capability to conventional circuits having a large number of: C-MOS MS's.
SECTION I INSTALLATION UNPACKING Carefully -remove ‘your: transceiver from: the: packing carrot and examine it for signs of shipping damage. : Should ‘any: be:apparent; notify the delivering carrier ‘or dealer immediately, stating the full extent of the damage. It is recommended you keep the shipping cartons. : {n the event storage; moving, or reshipment becomes necessary; they some:in handy. ‘Accessory hardware, cables; etc., are packed with the transceiver. Make sure you have not overclocked anything. 1.
Angle adjustment Optional installation POWER REQUIREMENTS The transceiver 1§ supplied ready to operate from any ululated 138V DT, 6 ampere negative ground source. An automobile 12 volt, negative ground, system is usually more than adequate. Some note must be taken, however, of the condition of the vehicle's electrical system. Items such as low battery, worn' generator/alterator, poor voltage regulator, tee, will impair operation of ‘your transceiver a5 well s the vehicle.
ANTENNA The most important single Stem that will influence the performance of any communication system is the antenna, forthwith reason; ia good; high-quality; halo antenna of 80 ohm impedance s recommendation: fixed or mobile: In VHF as:well as the low bands; every watt of ERP makes some: difference. Therefore; 25 watts: average’ output plus 3dB of gain antenna equals: 50 watts ERP, presuming low VOW of course. The ‘few more dollars invested ina gain: type antenna is well worth it.
SECTION IV CONTROL FUNCTIONS FRONT PANEL [SCAN START/STOP: SWITCH TUNING SPEED SWITCH 1B TRANSMIT INDICATOR FREQUENCY DISPLAY ELONGATION S Witch ZIT CONTROL (BI TUNING CONTROL KNOB MEMORY-WRITE S Witch TONE CALL SWITCH RECEIVER INDICATOR {METER COMMEMORATOR SWITCH MIMIC CONNECTOR SQUELCH ‘CONTROL and RE POWER SWITCH VOLUME CONTROL and POWER SWITCH {DSCAN:STOPMODE SELECT SWITCH 1. (SCAN-STOP SWITCH FUNCTION SWITCH With' this switch: you can select the relationship: of the two CEO's, and the duplex modes.
2. 8. 7 A/B: The Memory Switch set at the "A" position, selects “AY VETO for both transmit and receive. When Switch is antitheses UBY position; "B VEQ is selected for. goth transmit and receive. I the either cases.: AN VEO: and B VEQ doting have relationship; and both Vet's can be used independently. RIT CONTROL Shifts the ‘receive frequency: kHz either side of the transmit frequency: Rotating the.
When: the scan has been stopped by autopilot or by depressing @ SCAN STOP SWITCH, by depressing the SCAN START/STOP SWITCH to restart the scan, twill start from the stopped memory channel or frequency. SCAN STOP SWITCH Manually stops any of the snag functions: VOLUME: CONTROL ‘and POWER SWITCH When'the control is turned completely counterclockwise, the power is FF. By tuning the control clockwise beyond the "click”’ the unit 18 muted ON and the audio level increases by further rotating it clockwise.
REAR PANEL ANTENNA CONNECTOR ACCESSORY: SOCKET MEMORY SWITCH LI POWER SOCKET EXTENSIONAL SPEAKER JACK 18 ANTENNA CONNECTOR This misused connection the antennae set. Is impedance is B0 ohms and connects with g PL:2589 connector. EXTERNAL SPEAKER JACK When an external speaker is used, connect it to this jack.
g ACC SOCKET CONNECTIONS Lodged QRO Base OOV 00 BRR Outside view: PIN No: FUNCTION 1. Output from squelch control stage. (+7V whensoever s ONJ 2 13.8 Volts DC in conjunction with the power switch operation. {0.3A Max.} 3 Connected to Push-coital; T/R change-over switch: When grounded: the set operates in the transmit mode, 4. Output from the receiver detector stage: Fixed output regardless of AF output of AF gain. 4 Output from Transmitter MIC amplifier sarge. 6. 8 Volts DC available when transmitting.
SECTION V. OPERATION HOW TO TUNE The Hollowing instructions are for tuning. Please read carefully and understand fully before turning ON your unit: Proper fining is necessary: for optimum operation. PRESET FREQUENCIES Whn the POWER switch is muted ON, the frequency display will show |5 717 5 MHz: for 145.
13 receiving and is selected by placing the MEMORY. Switch in the A" position. The transmit and receive frequency will be controlled by A" VFO, displayed on the frequency display: and stored in: A" memory. However "B” VFQ will follow “A" VFO at the same frequency. difference they were sett By placing the MEMORY Switch in the /B position, the transmit and receive frequency will be controlled by VB’ VFO, and YA’ VEO will follow B VFO at the same frequency difference they were set at.
W Switching from ore VEO Yo the other VFO does not tear the first VEO. The frequency is retained in the V Ed's memory: FOR EXAMPLE: With the FUNCTION Switch in the "A/8" position, if 145.125MHz is set with "A" VEQ, and the MEMORY Switch asset to B VEO, the frequency readout will show "B CEO's frequency, but 145, 125MHz is still stored in “AY VFW's memory. Returning the VEQ switch to “A’ VERVE position, and 5.125 will ‘be displaced on: the: readout.: Accordingly.
L1 1 you change ‘the receiving {7A7 VEQ) frequency, the: transmitting (V8" VEO) frequency will follow the receiving frequency at the same frequency difference. So, first, set YA VFO and B VFQ at the frequencies for repeater input/output frequency separation. This makes repeater operation simple. FOR EXAMPLE: If you change the receiving frequency: from 145.725MHz to 145.B75MHz; the transmitting fre quench will change from 145.025MHz to 145.175MHz, 50 now you' can access an !45,175/ 145875 repeater.
and programs the new frequency 145.7 MHz Frito Memory Channel 1. 4, ‘Program:any desired frequencies in Memory. Channels {2 through 5 in the same manner. Memory Channels 11} ‘and [Z] ‘are used also ‘for Programmed Scan. For Programmed Scan ‘operation, refer to SCANNING : OPERATION. MEMORY READING Set the MEMORY. Switch: to the desired Memory Channel whichever frequency: the ‘memory was set, that previously programmed: frequency is recalled. When the MEMORY.
B To stop the scanning without the auto-stop actions, depress the Scan Start/Stop Switch or Scan-Stop switch. To restart the scanning, depress the Scan Start/Stop: Switch again. When the scanning has been stopped: by depressing the Scan Startup Switch, the scanning will start: from where the MEMORY Switch is set.
5 1% the squelch 1s snagged, and the Scan-Stop-Mode Select:Switch is In tha BUSY {out} position: the scan stops when the squelch is opened and a signal s received. 1 the squelch is not engaged when ‘the Scan Start/Stop Switch has been depressed. the scan does not stop at any signals 1§ the squelch {5 opened by a signal and the Scan-Stop-Made Select Switch is in the EMPTY {socked the scan stops when the squelch is closed:and bacchanalians empty.
10 8.° The scanning speed dan be adjusted by the SCAN SPEED Central located on the driver unit inside caver. Rotating the control clockwise makes the scanning speed faster. The Tuning Control does not:function while the scan is operating. RECEIVING Make sure the Volume Control and Power Switch is in the OFF position, then connect the power supply cord to the power connector. The red lead should be connected to the positive side of the power source and the black lead to the negative side.
For repeater operation, set (11 FUNCTION Switch in the "PUD-R" or position. in the "DURAN! position, the transmitting frequency is 600K HZ below the receiving frequency. Initiate “PUD-R " position, the transmitting frequency is B00KHz above the receiving frequency. The receiving frequency tan be selected by any position of the MEMORY Switch.
SECTION Vil RUBLE SHOOTING Your (C-255E has been tested very carefully at the factory: before shipping. : The chart below has bean: designed 1o help you correct any problems which are not equipment malfunctions.: Hf vou are not able collocate the problem and/or solve it through use of this chart, please contact our dealer tragicomic distributor for assistance. Problem Possible Cause Solution 1. Power does not come ON when the switch is furred. Power cable 'is improperly connected.
Problem Possible Cause Solution 6. The | frequency does not change by rotating the Tuning knob, MEMORY. Switch is set in one of the memory Chan: nails. Set ‘the MEMORY Switch to the VA or "B position. The receive mode functions : drapery: and your signals ‘are transmitted, bt you are friable to: make ‘cons tact | with | another station. {(When desire ing SIMPLEX mode.
PLL: UNIT: TRANSISTORS (When the operating frequency is 145.000MHz.} TRANSMIT RECEIVE Tr No. Eggshell EMERGENT flgg& Staggering REMARKS LITIGATE DRAIN | | SOURCE (WATERGATE DRAIN' | SOURCE 055 o GND 0.8 o GND: agitate 88 155 145 88 155 038 35 50 0,15 188 7.0 105 Q:8 [ GND 74 195 1 GND 74 195 Q10 1.2 78 056 1.2 8 055 Qiyiieg 012 PLL UNIT IC PIN No.
