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SR500

RECEIVER

TECHNICAL MANUAL

(1891 1233)

©

Copyright Wood & Douglas Ltd 1999

version: 1.0

issue: March 1999

LATTICE HOUSE

BAUGHURST ROAD

TADLEY

HAMPSHIRE

UK RG26 5LP

Tel: +44 (0)118 981 1444

Fax:+44 (0)118 981 1567

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Summary of Contents for SR500

Page 1: ...R500 RECEIVER TECHNICAL MANUAL 1891 1233 Copyright Wood Douglas Ltd 1999 version 1 0 issue March 1999 LATTICE HOUSE BAUGHURST ROAD TADLEY HAMPSHIRE UK RG26 5LP Tel 44 0 118 981 1444 Fax 44 0 118 981 1567 ...

Page 2: ......

Page 3: ... THE SOFTWARE 12 4 3 SERIAL CHANNEL SELECTION 13 4 4 PARALLEL CHANNEL SELECTION 13 4 5 PROGRAMMING RANDOM CHANNELS 13 4 6 PROGRAMMING SEQUENTIAL CHANNELS 14 4 7 PROGRAMMING FROM CUSTOMER EQUIPMENT 14 Section 5 Technical specifications 15 DRAWINGS WD1660 XX1 CIRCUIT DIAGRAM FOR SR500 WD1660 XX2 COMPONENT OVERLAY FOR ST500 Sheet 1 of 2 WD1660 XX2 COMPONENT OVERLAY FOR ST500 Sheet 2 of 2 C WD1660 00 ...

Page 4: ...1891 1233 1 1 June 1999 ...

Page 5: ...nge specifications of its products without prior notice in accordance with the company policy of continued product improvement The SR500 is a UHF Narrow band FM receiver intended for a variety of OEM applications It combines high performance with relatively low cost and small size and is intended for PCB mounting within customer equipment NOTE This device complies with Part 15 of the FCC Rules Ope...

Page 6: ...6 1891 1233 1 1 June 1999 ...

Page 7: ...uipment The location of these connectors is shown in the figure above and detailed in the following tables PIN NAME FUNCTION REMARKS 1 0V 0 Volts Not Connected on early units 2 RF I P RF Input 50 ohms 3 OV 0 Volts common ground Connector PL1 pin detail PIN NAME FUNCTION REMARKS 1 VIN positive supply 6 0V to 15 0V 2 0V 0 volts common ground Connector PL2 pin detail PIN NAME FUNCTION REMARKS 1 RSSI ...

Page 8: ... blocking capacitor SR500C 1 5V p p audio no audio muting 4 DATA Data output open collector no pull up 5 5V 5 volt supply output 50mA maximum current drain 6 0V 0 volts common ground 7 RS232 I P serial programming input if not used leave not connected or ground 8 RB1 parallel frequency select internal pull up to 5V active low 9 RB2 10 RB3 Connector PL3 pin detail ...

Page 9: ...ng arrangement Thus only 2V of the 5V supply is dropped across the front end device After the RF amplifier the signal passes through a second tuned helical filter F4 Along with F2 this provides sufficient selectivity to give image rejection in excess of 70dB The signal then passes to TR1 a dual gate MOSFET which acts as the first mixer 3 3 VCO SYNTHESISER A WD1647 VCO module U1 is used to generate...

Page 10: ...he resulting audio output is low pass filtered by R32 C36 to remove any high frequency components including the 455KHz IF before being buffered by IC5b and output via PL3 IC3 provides an RSSI output which is brought out of the SR500 via PL3 without any extra buffering This provides and output between 0 5 and 2V for a signal level range of 60dB The SR500 also includes squelch circuitry to provide a...

Page 11: ...programmed into the unit by a synchronous PCM interface protocol The software supplied with the SR500 receiver is the SR500PRG exe program The software can be run on a PC with the serial port connected to PL3 of the SR500 receiver via a suitable adaptor as shown in Figure 2 If the read back function is desired then PL3 pin 10 of the receiver must be connected to pin 2 of the PC serial port via a b...

Page 12: ...to the PC using the programming adaptor 2 Insert the SR500PRG disk into drive A and type A SR500PRG return then type 3 The user is then prompted to enter the serial port number of his PC which is used to communicate with the SR500 receiver Enter 1 or 2 After the software has successfully loaded the main menu screen is displayed as shown in Figure 3 The screen shows the default settings which are e...

Page 13: ...r 999 as the new frequency The screen then displays parallel channel selected Three inputs RB1 RB3 and RB3 applied via PL1 to pin 8 pin 9 and pin 10 respectively select the operating channel as shown in the table right 1 logic high CHANNEL SELECTION PIN 10 PIN 9 PIN 8 CHANNEL LOW LOW LOW 7 LOW LOW HIGH 6 LOW HIGH LOW 5 LOW HIGH HIGH 4 HIGH LOW LOW 3 HIGH LOW HIGH 2 HIGH HIGH LOW 1 HIGH HIGH HIGH 0...

Page 14: ...omatically When the frequency table has been generated the user then selects F6 to program the unit The function key F2 can be used to copy the contents of channel 16 31 to channel 0 15 to ease sequential programming 4 7 PROGRAMMING FROM CUSTOMER EQUIPMENT In the event of a customer wishing to program the SR500 receiver from his own equipment then the following data sequence must be used allowing ...

Page 15: ...ly voltage 6 15 DC ve earth Supply current at 7 2V 30mA Interface connections 2 7 10 pin 0 1 header RF connection 3 pin 0 1 header Operating temperature 10o C to 55o C Storage temperature 30o C to 70o C Weight 40gm Type approval European approval ETS 300 220 Sensitivity 115 dBm for 12dB SINAD Image spurii 70dB Intermodulation response rejection 60dB Blocking 90dB Intermediate frequencies 45 MHz an...

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