OPNSR500SR500 Receiver

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 1444Fax:+44 (0)118 981 1567 1.1/June 19991891 1233 Contents Section 1 An overview....................................................5 Section 2 Operation......................................................7 2.1 INSTALLATION...............................................7 2.2 CONNECTION ........................................................7 Section 3 Technical description............................................9 3.1 POWER SUPPLY.............................................9 3.2 RF FRONT END & MIXER.......................................9 3.3 VCO & SYNTHESISER.........................................9 3.4 IF & AF STAGES ..........................................10 Section 4 Frequency Programming.........................................11 4.1 INTRODUCTION.............................................11 4.2 RUNNING 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/XX1CIRCUIT DIAGRAM FOR SR500 WD1660/XX2COMPONENT OVERLAY FOR ST500 (Sheet 1 of 2) WD1660/XX2COMPONENT OVERLAY FOR ST500 (Sheet 2 of 2) C WD1660 00ITEM LIST FOR LEADED COMPONENTS FOR SR500 A SM1660 00ITEM LIST FOR SURFACE MOUNT COMPONENTS FOR SR500 1891 12331.1/June 1999 5 1.1/June 19991891 1233 Section 1 An overview Wood & Douglas are an independent UK company dedicated to the design and manufacture of high quality RF designs for the telemetry, security, broadcast and video markets world- wide. The information given in this manual is Copyright Wood & Douglas and is provided to the original purchaser for the purposes of operation and routine maintenance. The contents of this manual must not be disclosed to any third party, nor may the purchaser make additional copies of the manual or store the information given on any electronic retrieval or mass storage system. The company reserves the right to amend or change 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. Operation is subject to the condition that this device does not cause harmful interference. The unit is labelled with a serial number label as shown below: ST500 31980912345 FCC ID ABCSR500 CECE where:990912345 is the serial number of the unit containing the date code for September 1998 ABC is the Wood & Douglas Ltd FCC code The approval of the SR500 will still require that the system containing it will also require approval in it’s own right. 6 1891 12331.1/June 1999 7 1.1/June 19991891 1233 NOTES: Pin spacing on all connectors is 2.54mm (0.1") All dimensions in millimetres Section 2 Operation 2.1 INSTALLATION 2.2 CONNECTION Connection to the SR500 receiver is via PL1, PL2 and PL3 which plug directly into the user's own equipment. The location of these connectors is shown in the figure above and detailed in the following tables. PINNAMEFUNCTIONREMARKS 10V0 VoltsNot Connected on early units. 2RF I/PRF Input50 ohms 3OV0 Voltscommon ground Connector PL1 pin detail PINNAMEFUNCTIONREMARKS 1+VINpositive supply +6.0V to +15.0V 20V0 voltscommon ground Connector PL2 pin detail PINNAMEFUNCTIONREMARKS 1RSSIS meter output0.5 - 2V signal strength indicator, 60dB range 8 1891 12331.1/June 1999 2SQFSquelch flagopen collector output, ON (low) = no signal (SR500C: ON = signal received) 3AUDIOAF output 250mV p-p baseband audio, no internal blocking capacitor (SR500C: 1.5V p-p audio, no audio muting) 4DATAData outputopen collector, no pull-up 5+5V+5 volt supply output 50mA maximum current drain 60V0 voltscommon ground 7 RS232 I/P serial programming input if not used, leave not connected or ground 8RB1 parallel frequency select internal pull-up to +5V, active low 9RB2 10RB3 Connector PL3 pin detail 9 1.1/June 19991891 1233 Section 3 Technical description Refer to the circuit diagram WD1660 at the rear of this manual. 3.1 POWER SUPPLY DC power is connected to the transmitter module via PL2. It is fed directly to regulator IC1. This provides a stable output of nominally +5V which is used to power all the remaining sections of the receiver either directly or via R-C decoupling networks. The 5V output from IC1 is also available at PL3 for the powering of external equipment with a current requirement of up to 50mA. 3.2 RF FRONT END & MIXER The antenna is connected via PL3. The signal passes directly into helical filter F2 which is tuned for the required frequency range. The use of a filter prior to the RF amplifier provides a high level of immunity from overloading by strong out-of-band signals. The signal then passes to a low noise RF amplifier, a bipolar design based around TR3. This circuit is run at relatively high current in order to minimise the possibility of overloading by strong signals, but to reduce overall current consumption it is “voltage stacked” with the synthesiser and VCO in a current sharing 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…

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Radio Frequency Investigation Ltd, Ewhurst Park, Ramsdell, Basingstoke, Hampshire, RG26 5RQ, ENGLAND. Tel: +44 (0) 1256 851193 Fax: +44 (0) 1256 851192 Registered in England, No. 211 7901. Registered Office: Ewhurst Park, Ramsdell, Basingstoke, Hampshire RG26 5RQ TESTING 0644 TEST REPORT FROM RADIO FREQUENCY INVESTIGATION LTD. Test Of: Wood & Douglas Ltd SR500 Receiver To: FCC Part 15: 1998 Class B Test Report Serial No: RFI/EMCB1/RP39403A This Test Report Is Issued Under The Authority Of Brian Watson Technical Director: Checked By: Tested By:Release Version No: PDF01 Issue Date: 2 September 1999Test Date: 27 July 1999 This report is issued in Adobe Acrobat portable document format (PDF). It is only a valid copy of the report if it is being viewed in PDF format with the following security options not allowed: Changing the document, Selecting text and graphics, Adding or changing notes and form fields. Furthermore, the date of creation must match the issue date stated above. This report may be copied in full. RADIO FREQUENCY INVESTIGATION LTD.TEST REPORT S.No: RFI/EMCB1/RP39403A EMC DepartmentPage 2 of 26 Issue Date: 2 September 1999 Test Of:Wood & Douglas Ltd SR500 Receiver To:F.C.C. Part 15: 1998 Class B This page has been left intentionally blank. RADIO FREQUENCY INVESTIGATION LTD.TEST REPORT S.No: RFI/EMCB1/RP39403A EMC DepartmentPage 3 of 26 Issue Date: 2 September 1999 Test Of:Wood & Douglas Ltd SR500 Receiver To:F.C.C. Part 15: 1998 Class B Table of Contents 1. Client Information......................................................................................................4 2. Equipment Under Test (EUT).....................................................................................5 3. Test Specification, Methods And Procedures..........................................................7 4. Deviations From The Test Specification...................................................................8 5. Operation Of The EUT During Testing......................................................................9 6. Summary Of Test Results........................................................................................10 7. Measurements, Examinations And Derived Results..............................................11 8. Measurement Uncertainty........................................................................................14 Appendix 1. Test Equipment Used...............................................................................15 Appendix 2. Measurement Methods............................................................................16 Appendix 3. Test Configuration Drawings..................................................................19 Appendix 4. Graphical Test Results............................................................................23 Appendix 5. Photographs of EUT.................................................................................25 RADIO FREQUENCY INVESTIGATION LTD.TEST REPORT S.No: RFI/EMCB1/RP39403A EMC DepartmentPage 4 of 26 Issue Date: 2 September 1999 Test Of:Wood & Douglas Ltd SR500 Receiver To:F.C.C. Part 15: 1998 Class B 1. Client Information Company Name: Wood & Douglas Ltd Address: Lattice House Baughurst Basingstoke Hants RG26 5LP Contact Name: Mr A Stickland RADIO FREQUENCY INVESTIGATION LTD.TEST REPORT S.No: RFI/EMCB1/RP39403A EMC DepartmentPage 5 of 26 Issue Date: 2 September 1999 Test Of:Wood & Douglas Ltd SR500 Receiver To:F.C.C. Part 15: 1998 Class B 2. Equipment Under Test (EUT) The following information (with the exception of the Date of Receipt) has been supplied by the client: 2.1. Identification Of Equipment Under Test (EUT) Brand Name: Wood & Douglas Ltd Model Name or Number: SR500 Unique Type Identification: SR50051 Serial Number: 990798022 Country of Manufacture: UK FCC ID Number: Not applicable Date of Receipt: 27 July 1999 2.2. Description Of EUT The equipment under test is a synthesised receiver with 12.5 kHz channel spacing for telemetry use. 2.3. Modifications Incorporated In EUT None stated by client. 2.4. Additional Information Related To Testing Power Supply Requirement: DC supply of 9 V (customer supplied) Intended Operating Environment: Commercial Weight: 0.03 kg Dimensions: 60 mm x 40 mm x 20 mm (including pins) Interface Ports: 10 pin connector for I/O 2 pin connector for power 3 pin connector for RF RADIO FREQUENCY INVESTIGATION LTD.TEST REPORT S.No: RFI/EMCB1/RP39403A EMC DepartmentPage 6 of 26 Issue Date: 2 September 1999 Test Of:Wood & Douglas Ltd SR500 Receiver To:F.C.C. Part 15: 1998 Class B 2.5. Support Equipment The following support equipment was used to exercise the EUT during testing: Description: ST500 Test Jig Brand Name: Wood and Douglas Model Name or Number: None stated by client Serial Number: WD011 FCC ID Number: None stated by client Cable Length And Type: N/A (Direct Connection to the EUT) Connected to Port: N/A Description: Plug Top power supply Brand Name: Seung Jin Electronics Co Model Name or Number: SJ-1205D Serial Number: WD009 FCC ID Number: None stated by client Cable Length And Type: 1.5m Twin Connected to Port: DC Input Port to Test Jig RADIO FREQUENCY INVESTIGATION LTD.TEST REPORT S.No: RFI/EMCB1/RP39403A EMC DepartmentPage 7 of 26 Issue Date: 2 September 1999 Test Of:Wood & Douglas Ltd SR500 Receiver To:F.C.C. Part 15: 1998 Class B 3. Test Specification, Methods And Procedures 3.1. Test Specification Reference: FCC Part 15: 1998 Class B Title: Code of Federal Regulations, Part 15 (47CFR15) Radio Frequency Devices: Digital Devices. Comments: A description of the test facility used for this test is on file with, and has been accepted by, the Federal Communications Commission as required by Section 2.948 of Federal Rules. Purpose of Test: To determine whether the equipment complied with the requirements of the specification for the purposes of certification. 3.2. Methods And Procedures The methods and procedures used were as detailed in: ANSI C63.2 (1987) Title: A…

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