Operating instructions

ManualsBrandsWood and Douglas ManualsComputer equipment1892

1892 1236 - SX500 Transmitter Operator Note - v1.6.1 / Apr 2005 1

SX500 TRANSCEIVER

OPERATOR NOTE

1892 1236

These operating instructions are intended to provide the user with sufficient information to

install and operate the unit correctly.

The Wood & Douglas SX500 UHF transceiver is intended to fulfil numerous OEM

applications by virtue of its highly flexible synthesized design approach, miniature size and

cost-effective performance. The transceiver can accept analogue and digital data input and

provides an RF output power of 100mW (adjustable down to 10mW, refer to Sales Office for

details). The unit complies with both MPT1329 and MPT1361 for license exempt use in the

UK, as well as being approved to the EN 300 220 specification for use throughout Europe.

The module is also approved to the EMC specification ETS 300 683.

The equipment approvals restrict the use of the equipment in the following manner:

Module use Mobile and Portable

Power Supply 5.5 - 15V DC (but not approved for use with a vehicular power

supply)

The following paragraphs detail the restriction of use against these specifications.

MPT1329 & MPT1361 Restrictions of Use

This transceiver is approved for license exempt use in the UK on specific frequencies as

shown in Table 1. The maximum Effective Radiated Power (ERP) for MPT1329 is 500mW

and for MPT1361 is 100mW. This means that an antenna with <0dB gain must be used when

the equipment is operating on MPT1361 frequencies.

A label must be applied to the outside of the equipment containing the following details:

Module designation: SX500

Radio Regulatory marking: as per table 1 for each frequency

CE text This product contains CE marked module SX500"

Summary of content (12 pages)

PAGE 1
SX500 TRANSCEIVER OPERATOR NOTE 1892 1236 These operating instructions are intended to provide the user with sufficient information to install and operate the unit correctly. The Wood & Douglas SX500 UHF transceiver is intended to fulfil numerous OEM applications by virtue of its highly flexible synthesized design approach, miniature size and cost-effective performance.
PAGE 2
EN 300 220 Restrictions of Use When used in the band 433.050 - 434.790MHz the unit output power must be set to <10mW with an antenna gain of <0dB. The duty cycle of the equipment is limited when used in the 433.050 - 434.790MHz frequency band. Note: the duty cycle of a module is defined as the ratio of the total on-time of the “message” to the total off time in any one hour period. The transmit/receive duty cycle must be < 10% in operation.
PAGE 3
Frequency (MHz) Restrictions Equipment Marking 458.5000 Band Edge 458.5125 SRD SI 1993/1591-15-GB 458.5250 SRD SI 1993/1591-15-GB 458.5375 SRD SI 1993/1591-15-GB 458.5500 SRD SI 1993/1591-15-GB 458.5625 SRD SI 1993/1591-15-GB 458.5750 SRD SI 1993/1591-15-GB 458.5875 SRD SI 1993/1591-15-GB 458.6000 SRD SI 1993/1591-15-GB 458.6125 SRD SI 1993/1591-15-GB 458.6250 SRD SI 1993/1591-15-GB 458.6375 SRD SI 1993/1591-15-GB 458.6500 SRD SI 1993/1591-15-GB 458.6625 SRD SI 1993/1591-15-GB 458.
PAGE 4
INSTALLATION Figure 1 SX500 Outline Drawing CONNECTION Connection to the SX500 transceiver is via PL1, PL2 and PL3 which plug directly into the user's own equipment. The location of these connectors is shown in Figure 1 and detailed in the following tables. PL1 PIN NAME 1 0V 2 RF O/P 3 0V FUNCTION REMARKS 0 volts common ground RF output 50 ohms output 0 volts common ground Table 2 PL1 Pin Connections PL2 PIN NAME 1 +VRAW 2 0V FUNCTION REMARKS DC Supply Input 5.
PAGE 5
PL3 PIN NAME 1 FUNCTION REMARKS Transmit Enable < 0.5V = Transmit ON (internal 20kO pullup) 2 DI Data Input Digital: DC coupled TTL compatible 3 AI Analogue Input Analogue : 750 mV p-p nominal 4 RSSI Received Signal Strength Indication RSSI: 0.5 - 2.0 V, 60dB dynamic range (<33kO output impedance) Squelch Open drain to <0.4V with 10kO load.
PAGE 6
FREQUENCY PROGRAMMING An area of the PIC memory is re-programmable and allows up to 24 channels to be set to random frequencies and 232 channels to be set to sequential frequencies. The first 8 of the random frequencies can be accessed in parallel mode using the three programming pins RB1, 2 and 3. To access the rest of the channels, the serial programming mode is required. The channel change can be controlled through this serial input.
PAGE 7
Running the Software The s/w is accessed after installing by a single click on the SX500 icon. A screen page as shown in the following figure will be displayed. All functions are accessed through this screen. The fields shown in colour can be accessed and modified. Those field shown in grey are fixed by the hardware of the SX500 and cannot be changed by the user. Data is accessed by moving through the fields using the mouse or the TAB key.
PAGE 8
View Internal EEPROM Contents This displays in a separate window the contents of the units EEPROM. The data displayed is for the functions and channels displayed on the main screen at that time. Data can be hand-modified by moving highlighting the data and over-writing it. THIS SHOULD ONLY BE CARRIED OUT WITH FULL KNOWLEDGE OF THE INTERNAL WORKING OF THE SX500. Note that the type of data in each field is displayed at the bottom of the window.
PAGE 9
Maximum Frequency The maximum frequency that the unit can work on is determined by the physical build of the unit and the alignment of the unit. If a frequency outside the alignment band is selected then the operation of the SX500 will no longer be to the stated specification. The maximum switching frequency over which the unit will operate is 5MHz.
PAGE 10
Unit Programming Commands To access these 4 functions, double-click on the text or highlight and press ENTER. When accessed, the relevant data areas on the other three screen areas are highlighted to show which data is being transferred. Set parallel ch. mode Changes the SX500 from serial channel selection mode to/from parallel. Read from the unit Download the data from the SX500, assuming that the correct interface lead has been made. Program unit Send all the data displayed on the screen to the unit.
PAGE 11
TECHNICAL SPECIFICATION Transceiver (Overall) Frequency Range 400 - 500 MHz (banded) Switching Bandwidth 5MHz Channel Spacing 12.5, 20 and 25 kHz Number of RF Channels 8 255 Frequency Stability +2.5ppm Supply Voltage 5.5 - 15V DC Supply Current Transmit Receive selectable with an external 3 line select selectable via a serial interface 32 random and 255 sequential <100mA at 7.2V DC < 40mA at 7.
PAGE 12
Transmitter RF Output Power 100mW +1, -2 dB adjustable down to 1mW Receive to Transmit Switching Time <25ms Power-on settling time <60ms Modulation Input Analogue : 750 mV p-p nominal Digital: DC coupled TTL compatible Frequency Response <10 - 3000 Hz flat (at -3dB) Receiver Sensitivity -115dBm/12dB SINAD at 25kHz channel spacing AF Output 250mV p-p into 10kO (muted by Squelch) RSSI Output 0.5 - 2.0V with 60dB range and 33kO o/p impedance Squelch Type Noise operated with hysteresis.