Multitone Electronics PLC RPE673 Multitone RPE673 Radio Paging Transcoder User Manual Prelim

Multitone Electronics PLC Multitone RPE673 Radio Paging Transcoder Prelim

Contents

Users manual

RPT 633TM1184 Issue 1 AL1 (May 1997) Page (i)TECHNICAL MANUALforUHF TRANSMITTERMODEL RPT 633andUHF SERIAL ENCODER MODEL RPE 673Printed and published in England
RPT 633Page (ii) TM1184 Issue 1 AL1 (May 1997)©Multitone Electronics plc 1997COMPANY LIABILITYThe information in this manual has been carefully compiled and checked for technicalaccuracy. Multitone Electronics plc accept no liability for inaccuracies or errors. In line withthe company policy of technical advancement, the information within this document may bechanged. The user should ensure that the correct issue of the document is used.Comments or correspondence regarding this manual should be addressed to:Multitone Electronics plcTechnical PublicationsMultitone HouseBeggarwood LaneKempshott HillBasingstokeHampshireRG23 7LLEnglandISSUE DATE1April 1994
RPT 633TM1184 Issue 1 AL1 (May 1997) Page (iii)CONTENTS Page (i) Title PagePage (ii) Company LiabilityPage (iii) ContentsPage (iv) Effective Page ListPage (v) Safety Summary WarningPage (vi) CautionsSection 1Introduction and SpecificationSection 2Operating InstructionsSection 3Technical DescriptionSection 4Installation and CommissioningSection 5ServicingSection 6Spare Parts ListSection 7DiagramsAppendix 1UHF Serial Encoder Model RPE 673
RPT 633Page (iv) TM1184 Issue 1 AL1 (May 1997)EFFECTIVE PAGE LISTPage No. Issue Page No. Issue Page No. Issue(i) 1 AL1 4-5 17-11 1(ii) 1 AL1 4-6 1(iii) 1 AL1 5-1 1A1-1 1 AL1(iv) 1 AL1 5-2 1A1-2 1 AL1(v) 15-3 1A1-3 1 AL1(vi) 15-4 1A1-4 1 AL11-1 1 AL1 5-5 1A1-5 1 AL11-2 15-6 1A1-6 1 AL11-3 15-7 1A1-7 1 AL11-4 15-8 1A1-8 1 AL12-1 15-9 1A1-9 1 AL12-2 15-10 1A1-10 1 AL13-1 16-1 1A1-11 1 AL13-2 16-2 1A1-12 1 AL13-3 16-3 1A1-13 1 AL13-4 16-4 1A1-14 1 AL13-5 16-5 1A1-15 1 AL13-6 16-6 1A1-16 1 AL13-7 16-7 1A1-17 1 AL13-8 16-8 1A1-18 1 AL13-9 17-1 1A1-19 1 AL13-10 17-2 1A1-20 1 AL14-1 17-3/4 1A1-21 1 AL14-2 17-5/6 1A1-22 1 AL14-3 17-7/8 1A1-23 1 AL14-4 17-9/10 1A1-24 1 AL1
RPT 633TM 1184 Issue 1(v)GREAT CARE MUST BE TAKEN TO AVOID BREAKING OPEN THEENCAPSULATION OF TR10 ON THE TRANSMITTER BOARD WHEN REPAIR ORCOMPONENT REPLACEMENT IS BEING CARRIED OUT, AS THIS COMPONENTCONTAINS TOXIC BERYLLIUM OXIDE.SAFETY SUMMARYThe following information applies to both operating and servicing personnel. GeneralWarnings and Cautions will be found throughout the manual where they apply.WARNING statements identify conditions or practices that could result in personal injury orloss of life.CAUTION statements identify conditions or practices that could result in equipment damage.WARNING
RPT 633TM 1184 Issue 1(vi)CAUTIONSDO NOT MOUNT OVER A HEATER OR RADIATOR, OR IN DIRECT SUNLIGHT ANDENSURE A DRY ENVIRONMENT. STATIC SENSITIVE DEVICES ARE USED WITHIN THIS EQUIPMENT. CARE MUST BETAKEN TO ENSURE DAMAGE TO THESE DEVICES IS NOT CAUSED BY HIGH LEVELSOF STATIC ELECTRICITY. SPARE BOARDS OR COMPONENTS SHOULD BE STOREDIN ANTI-STATIC PACKAGING WHEN NOT INSTALLED IN THE EQUIPMENT.
RPT 633TM1184 Issue 1 AL1 (May 1997) Page 1 - 1SECTION 1INTRODUCTION AND SPECIFICATIONCONTENTS:1. INTRODUCTION2. ROLE OF THE TRANSMITTER4. PHYSICAL CONSTRUCTIONSPECIFICATIONS5. Transmitter6. Connectors7. Physical Characteristics8. Operational Enviroment9. Power Supply10. CRYSTAL FREQUENCY CALCULATION_______________________INTRODUCTION1. Sections 1 to 7 of this manual outline the installation and operation of the RadioPaging Transmitter model RPT 633. Appendix 1 details the Serial Encoder model RPE673 and provides appropriate cross references to the main part of this manual(Sections 1 to 7) where functionality is common.ROLE OF THE TRANSMITTER2. The transmitter is designed for operation with the RPE 340-series of telephone coupledencoders, or from the encoder output of the Access 3000, which together provide radiocoverage with speech for smaller sites. The RPT 633 operates in the UHF band(420MHz to 470MHz), divided into three sub-bands, and has an output of 2.5 Watts.3. Digital control reduces the wiring between the encoder and transmitter to a single pairfor tone and display systems. A four wire connection is required for speech systems.
RPT 633TM 1184 Issue 1Page 1 - 2PHYSICAL CONSTRUCTION4. The transmitter consists of two boards, a transmitter board mounted in the baseassembly and a VOX keying module mounted in the cover assembly.SPECIFICATIONSTransmitter5. The following describes the performance and physical characteristics of the RPT 633UHF transmitter:a) Frequency Range: 420MHz to 470MHzb) Frequency Bands: Band 1420MHz to 424.99MHzBand 2425MHz to 446.99MHzBand 3447MHz to 470MHzc) Channel Spacing: Factory set to 10kHz, 12.5kHz, 20kHzor 25kHzd) Frequency Stability (normal): ±5ppm from -10EC to +55EC(high stability): ±1.5ppm from -10EC to +55EC±2ppm from -25EC to +55EC±2.5ppm from -30EC to +60ECe) Output Power: 2.5W ±1dBf) Duty Cycle: 50% (Max transmit time 2.5 minutes)g) Nominal Load Impedance: 50 Ohmsh) VSWR Protection: Protection against short term removalof antenna (maximum of five calls withantenna disconnected).Connectors6. The following connectors are mounted on the transmitter board:a) PSU - SK3: 2.1mm jack socketb) Digital - SK2: 2-way modular keyed connectorc) Analogue - SK1: 2-way modular keyed connectord) RF - SK4: TNC socket
RPT 633TM 1184 Issue 1Page 1 - 3Physical Characteristics7. The dimensions and weight of the transmitter are as follows:a) Overall Dimensions: Width 235mm (9.5in.)Depth 210mm (8.3in.)Height 90mm (3.6in.)b) Weight (Excluding PSU): 1.2kg (2.65lbs.)Operational Environment8. The environmental characteristics of the transmitter are as follows:a) Temperature Range: Operational -10EC to +50ECb) Humidity: 0-90% RH (non-condensing)c) Altitude: Up to 2000 metresPower Supply9. 17V 0.8A DC Nominal supplies from Multitone Power Supplies:0301-0605 240V (UK)0301-0606 220V (EURO)0301-0607 110V (US)CRYSTAL FREQUENCY CALCULATION10. To calculate the carrier crystal frequency the following formula should be used:Crystal Frequency = Operating FrequencyAWhere A = 56 for Band 3or A = 48 for Bands 1 and 2
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RPT 633TM1184 Issue 1Page 2 - 1SECTION 2OPERATING INSTRUCTIONSThe transmitter is fully automatic in use and operation is limited to switching on the mainssupply.
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RPT 633TM1184 Issue 1Page 3 - 1SECTION 3TECHNICAL DESCRIPTIONCONTENTS:1. INTRODUCTIONTRANSMITTER2. Power Supplies3. Mode Select Circuit5. Audio Input6. Data Input7. Crystal Oscillator8. High Stability Version9. Voltage Controlled Oscillator (VCO)10. Phase Locked Loop (PLL)11. Transmitter Keying13. Frequency Multiplier14. Band Pass Filter15. Driver Stages16. Output AmplifierVOX KEYING MODULE17. General18. Analogue Path19. Data Mode20. DecodingOPERATION21. General22. Power Up23. Data Path24. Switching to Speech29. Switching from Speech to DataTABLES Page1. VOX Keying and Mode Signals 3-7
PLLCIRCUIT RFCIRCUITDATACIRCUITSPEECHCIRCUITVOXKEYINGMODULEANALOGUE INPUTDATAMODETx KEYPSG/10280-1DIGITALINPUTRPT 633Page 3 - 2TM1184 Issue 1CONTENTS: (Continued)FIGURES Page1. Block Diagram 3-22. Module Interconnection Diagram 3-63. Speech Call 3-84. Open Channel Speech 3-85. Switching Into Speech 3-96. Switching From Speech 3-10_______________________INTRODUCTION1. The RPT 633 Transmitter accepts analogue or digital information which ismodulated onto an UHF signal. The transmitter output frequency is produced bydoubling the frequency of a voltage controlled oscillator (VCO). The VCO is lockedto a reference crystal oscillator which is frequency modulated by either the Data orAudio input signals. A basic block diagram is shown at Figure 1.Figure 1: Block DiagramTRANSMITTERPower Supplies2. A nominal 17V DC power supply is fed into the board at SK3 where it is filteredby L14, L15, L16, C67 and C68. Fixed voltage regulators IC3 and IC4 provide 12Vfor the transmitter circuit and output transistor respectively, while regulator IC5produces 5V for the transmitter and VOX Keying module. Integrated circuit IC2produces 8.2V for the VCO and buffer amplifiers and IC11 acts as a voltageconverter to produce -11V from a 12V input.
RPT 633TM1184 Issue 1Page 3 - 3Mode Select Circuit3. With the mode input at 5V the Speech mode is selected. The output of IC6d is low,inhibiting the passage of Data by shorting the data path to 0V via D11 andenabling the passage of Audio by forward biasing D9. Variable resistor RV3together with R102, R103, R108 and R116 hold the output of IC12d atapproximately 0V, which in turn sets the voltage on varactor diode D8 to give thenominal carrier frequency of the transmitter.4. With the mode input at 0V the Data mode is selected and the output of IC6d goeshigh, inhibiting the audio path by reverse biasing D9 and allowing data to passfrom IC6b to IC6a.Audio Input5. The audio input is amplified and pre-emphasised by IC13b before passing throughthe audio gate D9 to the limiting amplifier IC13a, the output of which is limited toapproximately 10V peak to peak. After limiting, the maximum speech deviation isset by RV4. The signal is then passed to TR12, IC10b and associated components,which form a modified 0.4dB four section Chebyshev Filter, which has a cut offfrequency of 2.6kHz and a modified frequency response to give an approximate2dB lift at 2.55kHz. This compensates for the fall off in deviation caused by thecharacteristics of the phase locked loop. Filtered audio passes through summingamplifier IC10a and unity gain buffer IC10d to modulating varactor diode D8.Summing amplifier IC10a also superimposes the audio signal onto the DC voltageproduced by IC12b.Data Input6. Input data may be selected to either pass through IC6c, which inverts it, or bypassIC6c depending on the setting of data polarity selector link LK3. The data passesthrough IC6b and IC6a, the output of which switches between being high impedanceor low impedance to 0V. The frequency of the crystal oscillator does not varylinearly with the voltage on D8 so the values of resistors R102, R103, R108, R116and RV5 have been chosen to give a voltage swing, at the output of IC12d, ofapproximately +3V to -4.8V as the voltage on the input of IC6b switches between0V and 5V. The data signal then passes through IC12a, IC12b and associatedcomponents, which form a fourth order Bessel filter, which give the data edges acontrolled risetime of 250µs. After filtering, the signal passes through IC10a andIC10d to varactor diode D8, RV2 being used to set the data deviation level. Thewhole of this modulation path is DC coupled so that a constant logic level on theinput produces a constant deviation of the output frequency.
RPT 633Page 3 - 4TM1184 Issue 1Crystal Oscillator7. The reference oscillator TR11 is of the crystal controlled Colpitts type, operating onthe fundamental frequency of the crystal which is 1/48th of the output frequency forBands 1 and 2 and 1/56th of the output frequency for Band 3. The oscillatorfrequency is trimmed by VC5. Varactor Diode D8 provides the modulation, Thecapacitance of the diode, and therefore the oscillator frequency varies with thevoltage across the diode. The output of the oscillator is buffered by IC8b.High Stability Version8. On the high stability version a temperature controlled crystal oven OV1 is fittedwhich covers the special high temperature crystal.Voltage Controlled Oscillator (VCO)9. Transistor TR2 is a Colpitts oscillator running at half the carrier frequency, thefrequency being determined by L1, C4, C5, C6 and the capacitance of the dualvaractor diode D1. The output of the oscillator is buffered by IC1 and TR4.Phase Locked Loop (PLL) 10. The VCO output frequency from TR4 is divided by 256 in IC9 and then buffered bylinear amplifiers IC8c and IC8d before being fed to IC7. Within IC7 the signal isfurther divided by either 6 (for output frequencies less than 447Mhz) or by 7 by aprogrammable divider, the division ratio being set by shorting link LK2, 1-2 equalsdivide-by-6 and 2-3 equals divide-by-7. Also, within IC7, the crystal oscillatorfrequency is divided by 64 before being fed, together with the VCO signal, to aphase/ frequency comparator. E.g. for a carrier frequency of 448MHz the crystaloscillator frequency is 8MHz which gives an input to the comparator of 125kHz. TheVCO is running at 224MHz which is divided by IC9 to give 875kHz and then by IC7(LK2 2-3) to give 125kHz. The PLL control output is fed out of IC7 at pin 13 andvia loop filter R47, R48, C69, and C70 to the VCO. The filter controls the dynamicbehaviour of the loop, the modulation frequency response and the level of the PLLreference frequency sidebands. When the PLL has achieved lock it sends a highin-lock signal from IC7 pin 12, via delay circuit R49, R50, C71 and D5, the buffersIC8a and IC8f, to forward bias TR5 and TR8. D5 allows C71 to discharge quicklywhen the lock fail condition occurs and to charge slowly when the in-lock conditionis restored.
RPT 633TM1184 Issue 1Page 3 - 5Transmitter Keying 11. Normal transmitter keying is achieved by fitting a shorting link across LK1 pins 2-3.In the quiescent state the Tx Key line is at 5V, the output of IC6f is at 0V and thebias voltages of TR5 and TR8 are shorted to 0V. When the VOX keying modulesets the Tx Key command to logic low the output of IC6f goes high impedance.Forward bias is applied to TR5 and TR8 providing the PLL is in lock.12. Provision has been made for an alternative method of keying the transmitter whichkeys the VCO off when the transmitter is not in use, thus removing any carriercomponents in the standby mode. This is achieved by fitting LK1 pins 1-2. A 0Vsignal on the Tx Key line then turns on TR3, via inverter IC6f, which in turn turns onTR1 and supplies 8.2V to the VCO transistor TR2.Frequency Multiplier13. Transformer T1, enabled by the in-lock signal turning on TR5, provides a balancedfeed to the multiplier diodes D3 and D4 which pass the desired transmit outputfrequency and reject the fundamental frequency and odd harmonics of it. Thedesired frequency is passed to TR6 for amplification Band Pass Filter14. This is made up of two cascaded two-section helical filters FL1 and FL2. The filtersreject any VCO leakage and any unwanted frequencies generated by themultiplication process.Driver Stages15. Transistors TR7, TR8, TR9 amplify the filtered signal up to a level of approximately250mW, inter stage matching being optimised by VC1 and VC2. The output powerfrom TR9 and ultimately the output power of the transmitter, is controlled by RV1,while the bias for TR8 is controlled by the keying line ensuring a high attenuationof the output signal when the transmitter is keyed off.Output Amplifier16. Matching between TR9 and TR10, operating as a class C amplifier, is optimisedby VC3. The output of TR10 is matched to the output filter by C50, C51 and alength of micro-strip line, the filter being formed by C53 to C60 and the micro-striplines. Any harmonics of the output frequency are attenuated by the filter and anyresidual VCO signal is attenuated by VC4 and L13. The output power at SK4 is2.5W.
RPT 633Page 3 - 6TM1184 Issue 1VOX KEYING MODULE General17. The VOX keying module decodes encoder presented serial data and controls thetransmitter. Interconnection between the Transmitter PCB and VOX Keying PCB isas shown in Figure 2.Figure 2: Module Interconnection DiagramAnalogue Path18. Analogue signals are input via external connector SK1 of the transmitter PCB andinternal connectors TL8 and TL9. The level is adjusted via RV1 (VOX keyingmodule PCB) and output is via connectors TL1 and TL2 to the speech input of thetransmitter PCB. This presents the correct audio level to the transmitter modulationcircuits.Data Mode19. Data signals are input via external connector SK2 of the transmitter PCB, bufferedby TR14 and then fed, via the internal connector PL1-4, to the VOX keying module.
RPT 633TM1184 Issue 1Page 3 - 7Decoding20. The VOX keying module decodes the incoming encoder serial data into the twologic signals shown in Table 1.Table 1: VOX Keying and Mode SignalsNOTE: Tx KEY is active low.Tx KEY MODE TRANSMITTER(PL1-2) (PL1-3) STATELow Low Data ModeLow High Speech ModeHigh Low/High OffOPERATIONGeneral21. Components IC1a and IC1b are negative edge retriggerable monostables havingoutput pulse widths of 4.5ms (OA) for the Mode signal and 2ms (OB) for the CLKsignals to IC2. TR1 and associated components are not used in these transmittersand are therefore by-passed via LK1 and LK2.Power-Up22. At power-up R4 and C5 hold IC2 CLR input low. This causes IC2 pin 3 (QC) toroute a low signal to IC3-6. Integrated circuit IC1a-6 routes a low signal to IC3-5,which results in the Tx Key signal at PL1-2 remaining high and holding thetransmitter keyed off.Data Path 23. To key the VOX keying module for data mode, the incoming data stream, via PL1-4, LK1, LK2, TP2 to IC1a-5, retriggers IC1a for the duration of the data. IC1a-7routes a low Mode signal via PL1-3 to set the transmitter into data mode wheneverdata is present. Integrated circuit IC1a-6 (OA) routes a high signal to IC3-5. Thisresults in a low Tx Key signal via LK4 illuminating D3 and, via PL1-2, Keyingon the transmitter.
RPT 633Page 3 - 8TM1184 Issue 1Switching to Speech24. To switch into the speech mode, either as part of a speech paging call or for openchannel speech, the encoder generates two 1ms pulses 4ms apart as shown inFigures 3 and 4.Figure 3: Speech CallFigure 4: Open Channel Speech25. The pulses are inverted at PL1-4 and the leading edge of the first pulse results inIC1-6 (OA) going high which switches PL1-2 low for 4.5ms (see Figure 3). Thetrailing edge of the first pulse results in IC1-7 and IC3-1 presenting two lows to IC3-12 and IC3-11 respectively, so that IC2-1 goes high. This has no immediate effecton the circuit since the resetting of IC1a after 4.5ms removes one of the two lowstates which caused J to go high.26. The negative-going edge at IC1-6 clocks IC1b so that IC1-10 goes high for 2ms.The trailing edge of the second pulse sets IC2-1 high again, but this time IC1bresets after 2ms, clocking IC2-12 and resulting in IC2-3 going high. This ensuresthat IC3-4 remains low during the speech mode.27. 4.5ms after the commencement of the second pulse, IC1-7 resets high so that thetransmitter is now keyed in the speech mode.28. Timings of IC1a and IC1b, controlled by RV2 and RV3 respectively, are absolutelycrucial to the reliable switching of the circuit into speech and must be accuratelyset.
RPT 633TM1184 Issue 1Page 3 - 9Switching from Speech to Data29. The speech cancel signal consists of 1.25s of binary 1s. In the speech mode IC1-7is high with the result that IC2-1 is low. The negative-going leading edge of the firstbit of data clocks IC1a so that IC1-7 goes low, switching PL1-3 to the low DATAmode. The negative-going transition at IC1-5, IC1a times out with the result that:a) IC1-7 goes high putting PL1-3 into the quiescent condition.b) IC1-6 clocks IC1b for 2ms.c) The combined lows at PL1-4 and IC1-6 result in IC2-4 going high.30. As IC1-10 goes low again, after 2ms, it clocks IC2 with the result that IC2-3 goeslow, IC3-4 goes high and PL1-2 returns to its quiescent high condition.Figure 5: Switching Into Speech
RPT 633Page 3 - 10 TM1184 Issue 1Figure 6: Switching From Speech
RPT 633TM1184 Issue 1Page 4 - 1SECTION 4INSTALLATION AND COMMISSIONINGCONTENTS:1. INTRODUCTIONINSTALLATION2. Positioning3. Shelf Mounting4. Wall Mounting5. Antenna6. Modulation Inputs8. Power Supply9. COMMISSIONINGTABLES Page1. Encoder Mounted in a Card Frame Assembly 4 - 42. Encoder Mounted in a Single Slot Housing 4 - 43. Operating Instructions 4 - 5FIGURES1. Mounting Hole Diagram 4 - 22. Rear Panel Connections 4 - 33. Typical Access 340 System Configuration 4 - 3_______________________INTRODUCTION1. Section 4 of this manual details the Installation and Commissioning procedures tobe carried out on a new equipment.
155105Dimensions in mmPSG/10290-1RPT 633Page 4 - 2TM1184 Issue 1INSTALLATIONPositioningCAUTIONDO NOT MOUNT OVER A HEATER OR RADIATOR, OR IN DIRECT SUNLIGHTAND ENSURE A DRY ENVIRONMENT.2. Carefully unpack the transmitter, power supply and antenna. Site the transmitter andpower supply in a convenient working position within reach of an AC power outletand within 1km of the encoder.Shelf Mounting3. Lay the transmitter on a suitable horizontal shelf on its integral mounting feet(sloping panel upwards). Connect the antenna as indicated in paragraphs 5 or 6and the remainder of the electrical connections as paragraph 7.Wall Mounting4. Mark and drill the wall as shown, suitable for No 8 plugs and round-head screws.Insert screws into plugs with the top of the screw head a maximum of 10mm fromthe wall and the bottom of the screw head a minimum of 5mm from the wall.Remove the rubber pads from the bottom of the base tray and hook the transmitteronto the screws. The transmitter can be mounted either antenna up or antennadown.Figure 1: Mounting Hole Diagram
RED & WHITELEADSBLACK LEADSTELEPHONEJUNCTIONBOX ORSOCKETPOWERSUPPLYPOWERSUPPLY0301-0193OR0360-9602TRANSMITTERRPT 633TERMINALBLOCK0360-8623ANALOGUEANALOGUEDIGITAL DIGITALENCODERRPE 340/341DTMF/MODEM/SPEECHDATA/DLCPSUPSG/10287-1RPT 633TM1184 Issue 1Page 4 - 3Antenna5. Two versions of the UHF antenna are available, a straight vertical whip for wallmounted transmitters and a right angled whip for shelf mounted transmitters. Figure 2: Rear Panel ConnectionsModulation Inputs6. When connecting the transmitter to an RPE 340 series encoder, SK1 and SK2should be connected as shown in Figure 3.Figure 3: Typical Access 340 System ConfigurationTEL I/F
RPT 633Page 4 - 4TM1184 Issue 17. When connecting an RPT 633 transmitter to a Access 3000, it is first necessary touse Engineering Mode Test 50 to configure the Encoder into the Non-DTMF mode.The connections shown in Table 1 and 2, as applicable, should then be madebetween the encoder and transmitter.Table 1: Encoder Mounted in a Card Frame AssemblySIGNAL ENCODER D TYPE CABLE COLOUR *TRANSMITTERNAME PIN No. PIN No. TYPE CODE INPUTData 29c 9 }0401-0009 {Orange } SKT2 {left 0V 30a 23 } { White/Blue }{rightSpeech {12a 17 }0401-0011 {Violet } SKT1 {right{12c 4 } { Yellow }{left * As seen from the rear of the transmitter.Table 2: Encoder mounted in a Single Slot HousingSIGNAL ENCODER CABLE COLOUR *TRANSMITTERNAME PIN No. TYPE CODE INPUTMODULARJACKPIN No.Data 29c 7}0301-0092 {Yellow } SKT2 {left 0V 30a 6 } { Blue }{rightSpeech {12a 2 }0301-0091 {Orange } SKT1 {right{12c 4} { Red }{left * As seen from the rear of the transmitter.8. Power SupplyEnsure that the power supply is correctly rated for your application and has thecorrect mains connector. Insert the power supply outlet plug into SK3 at the rearof the unit and plug the supply into the mains socket.
RPT 633TM1184 Issue 1Page 4 - 5COMMISSIONING9. Refer to Table 3 and carry out the operating procedures as detailed for theRPT 633 transmitter.Table 3: Operating InstructionsENCODER REFERENCEAccess 1000 } LCU Operator's GuideAccess 3000 } 9261-0382 or 9261-0682RPE 340 } TM1158, Section 2, paragraphs 19-40RPE 341 }RPE 340A TM1154, Section 4, paragraph 4.3RPE 350 TM1164, Section 4, paragraph 11
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RPT 633TM1184 Issue 1Page 5 - 1SECTION 5SERVICINGCONTENTS:1. INTRODUCTION2. REPAIR POLICY3. TEST EQUIPMENTDISMANTLING AND RE-ASSEMBLY INSTRUCTIONS4. Access to Circuit Boards5. Removing the VOX Keying Module6. Removing the Transmitter Board7. Re-AssemblyTRANSMITTER BOARD ALIGNMENT PROCEDURE8. Initial Settings9. Initial Connections10. Setting up Phase Lock Loop11. Transmitter Alignment12. Setting Data Deviation and Centre Frequency13. Setting Analogue Modulation14. VOX KEYING MODULE ALIGNMENT PROCEDUREANTENNA CUTTING15. Introduction16. Cutting17. FAULT-FINDINGTABLES Page1. Data Deviation 5-72. Analogue Deviation 5-83. Antenna Lengths 5-94. Test Points 5-10
RPT 633Page 5 - 2TM1184 Issue 1CONTENTS: (Continued)FIGURES Page1. Transmitter Layout: Variables, Links and Test Points 5-42. Antenna Cutting 5-9_______________________INTRODUCTION1. Section 5 details the dismantling and reassembly instructions, alignment procedureand the test equipment required to carry out the procedure. The transmitter containstwo printed circuit boards (PCB's). It is recommended that field service engineerscarry one complete VOX Keying Module for on-site replacement and subsequentbase repair of the faulty board.REPAIR POLICY2. In Section 6 is a list of spare parts for servicing the transmitter board down tocomponent level. Passive chip components (capacitors and resistors) are unlikelyto contribute to failure of the equipment in the field. Chip transistors and diodesshould be ordered in strips of 10 or more. A replacement antenna will need to becut to length before fitting, according to the information given in paragraph 17.TEST EQUIPMENT3. The following test equipment is required to carry out the repair procedure.CDC Power Supply 18V, 1A.CAbsorption Wattmeter, 5W 420-470MHz,orCThruline RF Power Meter 5W, 420-470MHz with Power Attenuator 5W,20-30dB.CFrequency Counter 500MHz, accuracy 1 part in 10 or better.7CAudio Signal Generator.CModulation Meter.COscilloscope.
RPT 633TM1184 Issue 1Page 5 - 3DISMANTLING AND RE-ASSEMBLY INSTRUCTIONS CAUTIONSTATIC SENSITIVE DEVICES ARE USED WITHIN THIS EQUIPMENT. CAREMUST BE TAKEN TO ENSURE DAMAGE TO THESE DEVICES IS NOTCAUSED BY HIGH LEVELS OF STATIC ELECTRICITY. SPARE BOARDS ORCOMPONENTS SHOULD BE STORED IN ANTI-STATIC PACKAGING WHEN NOTINSTALLED IN THE EQUIPMENT.Access To Circuit Boards4. Disconnect the antenna and connectors from the rear of the case. At the rear of theunit unscrew and remove the two retaining screws. Lift the top cover at the rear andinvert it so that it slides under the base from the front, ensuring that the ribboncable and the two screened cables are not strained.Removing the VOX Keying Module5. Disconnect the ribbon cable at the keying module. De-solder the two screenedcables at the transmitter board. Remove the four screws which secure the keyingmodule to the lid and remove the module.Removing the Transmitter Board6. Disconnect the ribbon cable at the transmitter board. De-solder the two screenedcables at the transmitter board. Remove the four nuts which secure the board to thebase and remove the board.Re-Assembly7. Re-assembly is the reverse of the procedure for dismantling.
RPT 633Page 5 - 4TM1184 Issue 1Figure 1: Transmitter Layout: Variables, Links and Test Points
RPT 633TM1184 Issue 1Page 5 - 5TRANSMITTER BOARD ALIGNMENT PROCEDUREInitial Settings8. Set the variable components and links as follows:VC1 -Anywhere.VC2 -Half Meshed.VC3 -Fully Un-meshed.VC4 -Fully Un-meshed.VC5 -25% Meshed.FL1 and FL2 - Adjusters standing proud by 2mm.RV1 -Fully Anti-clockwise.RV2 -Mid Position (15 turns from either end).RV3 -AnywhereRV4 -Mid PositionLK1 -Position 2-3 Normal Version.Position 1-2 FTZ Version.LK2 -Position 1-2 Output frequencies less than 447MHz.Position 2-3 Output frequencies greater than or equal to 447MHz.LK3 -Position 2-3 Normal Operation.Position 1-2 Invert Data Sense.Initial Connections9. Set up the test equipment as follows:a) Connect the absorption wattmeter or power meter to the antenna socket usinga lead no longer than 300mm.b) Connect the modulation meter and frequency counter to the attenuated output.c) Connect the power supply to SK3.d) Connect the audio signal generator via a 0.47µF capacitor to SK1.
RPT 633Page 5 - 6TM1184 Issue 1Setting up Phase Lock Loop10. Set up the Phase Lock Loop as follows:a) Switch on the power supply.b) Connect the oscilloscope to TP3.c) Adjust the slug of L1 to give 5V ±0.2V DC at TP3.Transmitter Alignment11. To align the transmitter carry out the following procedure:a) Connect the oscilloscope to TP7.d) Adjust RV3 to give 0V ±50mV DC at TP7.c) Key ON the transmitter by shorting TP2 to TP9.d) On FL1 and FL2 turn the four adjusters ½ turn at a time until the power meterindicates or the power supply current increases.e) If no power appears slightly adjust VC2 or VC3 and repeat (d).f) Tune the four adjusters of FL1 and FL2 for maximum power.g) Tune VC1, VC2 and VC3 for maximum power and then RV1 to give a powermeter reading of 2.5W.h) Re-adjust VC1, VC2 and VC3 for maximum power then RV1 for 2.5W ±0.2W.Setting Data Deviation and Centre Frequency12. To set the data deviation and centre frequency carry out the following procedure:NOTE: The purpose of this adjustment is to set the deviation, i.e. for 25kHzchannel spacing, to ±4.5kHz (9kHz total) when the data polarity switch isset from "1" to "0".a) Set LK3 of the VOX keying module to AB to select the DATA mode.b) Connect TP14 to TP15 (+5V) to select the binary 1 state.
RPT 633TM1184 Issue 1Page 5 - 7c) Measure the output frequency to the nearest 10Hz; switch the data polarity tothe binary O state by connecting TP14 to TP9 and again measure the outputfrequency. Adjust RV2 and repeat this process until the difference between thetwo frequencies is as given in the TOTAL DEVIATION column in Table 1 for theappropriate transmitter channel spacing, with a tolerance of ±100Hz. d) Using a plastic trimming tool adjust VC5 until the mean of the two frequenciesmeasured at (c) is within 100Hz of the specified center frequency of thetransmitter.e) Repeat sub-paragraphs (c) and (d) as necessary.f) Switch the mode switch to ANALOGUE by setting LK3 on the VOX keyingmodule to AC and adjust RV3 to give the specified centre frequency of thetransmitter to a tolerance of ±100Hz.Table 1: Data DeviationCHANNEL DEVIATION TOTALSPACING DEVIATIONkHz kHz kHz25 ±4.5 920 ±3.6 7.212.5 ±2.25 4.510 ±1.8 3.6Setting Analogue Modulation13. To set the analogue modulation carry out the following procedure:a) Set LK3 of the VOX keying module to AC to select the ANALOGUE mode.d) Set the audio generator output to 1.25kHz at a level of approximately 11mVpeak-to-peak as measured on the oscilloscope. Monitor the deviation on themodulation meter.c) Refer to Table 2(a) and adjust the generator output level to give give adeviation corresponding to the channel spacing. d) Increase the signal generator output level by 20dB and adjust RV4 to give adeviation coresponding to that given in Table 2(b). This should be the larger ofthe Peak + or Peak - readings on the modulation meter.e) Reduce the signal generator level by 20dB and re-adjust its level to give adeviation corresponding to that given in Table 2(c).
RPT 633Page 5 - 8TM1184 Issue 1f) Increase the signal generator level by 20dB and re-adjust RV4 to give adeviation corresponding to that given in Table 2(b).g) Vary the signal generator frequency between 300Hz and 2.5kHz and check thatthe deviation does not exceed that given in Table 2(d). If it does, tune to thefrequency that gives the maximum deviation and adjust RV4 to give a deviationcorresponding to that given in Table 2(e). This should also be the larger of thePeak + or Peak - readings.Table 2: Analogue DeviationCHANNE DEVIATION DEVIATION DEVIATION DEVIATION DEVIATIONL(a) (b) (c) (d) (e)SPACING kHz kHz kHz kHz kHzkHz25 ±3 4.75 ±3 54.920 ±2.4 3.8 ±2.4 43.912.5 ±1.5 2.4 ±1.5 2.5 2.410 ±1.2 1.85 ±1.2 21.9VOX KEYING MODULE ALIGNMENT PROCEDURE14. To set the timing circuits of the VOX Keying Module carry out the followingprocedure:a) With the RPE340 in the Engineering Mode, initiate Function 2, RPT calibrationsignal. Alternatively use a P391 Test A7 to generate the same signal.b) Monitor TP6 and adjust RV2 so that the mark/space ratio is 4.4/3.6ms.c) Monitor TP3 and adjust RV3 so that the mark/space ratio is 2.6/5.4ms.ANTENNA CUTTINGIntroduction15. In the event of damage to the antenna, the replacement will require cutting to lengthin accordance with the following instructions.Cutting16. The antenna is a one piece UHF stub with internal connector. With reference toFigure 1 after removal of the cap, the antenna should be cut to the length indicatedin Table 3, depending on frequency, and the cap replaced. The Part Numbers ofthe uncut stubs are 5501-0001 (right angled) and 5501-0002 (straight).
RPT 633TM1184 Issue 1Page 5 - 9Table 3: Antenna LengthsCUT LENGTH FREQUENCYmm MHz156 420154 425152 430150 435149 440147 445145 450143 455142 460140 465139 470Figure 2: Antenna Cutting
RPT 633Page 5 - 10 TM1184 Issue 1GREAT CARE MUST BE TAKEN TO AVOID BREAKING OPEN THEENCAPSULATION OF TR10 ON THE TRANSMITTER BOARD WHEN REPAIR ORCOMPONENT REPLACEMENT IS BEING CARRIED OUT, AS THIS COMPONENTCONTAINS TOXIC BERYLLIUM OXIDE.FAULT-FINDING WARNING17. Table 4 shows the signals to be expected at the various test points as an aid tofault-finding.Table 4: Test PointsT.P. SIGNAL 1 Carrier Frequency 2 Tx Key (low-going) 3 PLL Control Voltage (nominally 5V) 4 VCO Frequency (div. by 256) 5 Crystal Frequency 6 In-Lock (high going) 7 Modulating Signal 8 -12V 9 0V10 Audio Signal (limited)11 Audio Signal (un-limited)12 Over-rides Lock Fail when connected to TP1313 +12V14 Data15 +5V
RPT 633TM1184 Issue 1Page 6 - 1SECTION 6SPARE PARTS LISTCONTENTS:1. GENERAL2. MODULESTRANSMITTER BOARD COMPONENTS3. Capacitors4. Connectors5. Crystals6. Diodes7. Inductors8. Integrated Circuits9. Links10. Resistors11 Transducers12. Transformer13. Transistor14. AntennaBANDED COMPONENTS15. Filters16. CapacitorsVOX KEYING MODULE COMPONENTS17. Capacitors18. Connector19. Diodes20. Integrated Circuits21. Resistors22. Transistor
RPT 633Page 6 - 2TM1184 Issue 1ITEM/CIRCUITREFERENCE DESCRIPTION PART NO.1. GENERALINSERT MOULDING SCREENED 0960-98878-WAY INTER CONNECT FLEXFOIL 4404-0001MOULDING COVER 0860-9846CLAMPING PAD ADHESIVE 1861-0225NUT M3 19663ESCUTCHEON 2060-9878WASHER PLAIN M3 20662LABEL EQUIP. 31600X7RUBBER FEET 23MM 33996SCREW No. 6X16MM PAN HD POZI AB 8204-06162. MODULESASSY PCB VOX KEYING MODULE 0260-7083PSU 240V UK PLUG 0301-0605PSU 220V EURO PLUG 0301-0606PSU 110V 0301-0607TRANSMITTER BOARD COMPONENTS3. CapacitorsC1,10,12,40,80 CAP CHIP 220p 10% 50V 3301-0150C2,47,72,74,111,117 CAP AL 10F 20% 16V 3401-0089C3,7,15,18,19,22,23,24,27,30 CAP CHIP 1n 10% 50V 3301-0100C4 CAP CHIP 1p 0.25p 50V 3301-0001C5,53,55 CAP CHIP 3p9 0.25p 50V 3301-0008C8,62,63,64,108,109 CAP AL 4F7 20% 25V 3401-0093C9,90,91,92,93 CAP AL 22F 20% 16V 3401-0090C11 CAP CHIP 4p 0.25p 50V 3301-0151C13,35 CAP CHIP 10p 0.25p 50V 3301-0013C14,54 CAP CHIP 1p8 0.25p 50V 3301-0004C16,17,36,67,68,75,79,85,87 CAP CHIP 4n7 10% 50V 3301-0108C20,38,41,46,49,52,66,95 CAP CHIP 100n -20+80% 25V 3301-0149C21,26,32,34,43,48,61,78,88,94,102 CAP CHIP 220p 10% 50V 3301-0081C25,60 CAP CHIP 5p6 0.25p 50V 3301-0010C28,29 CAP CHIP 33p 5% 50V 3301-0025C31,33,73,76,77 CAP CHIP 1n 10% 50V 3301-0100C39,118,129 CAP CHIP 10n 10% 50V 3301-0112C42 CAP CHIP 22p 5% 50V 3301-0021C44 CAP CHIP 4p7 0.25p 50V 3301-0009C45,70,116 CAP CHIP 1F 20% 16V 3306-0020
RPT 633TM1184 Issue 1Page 6 - 3ITEM/CIRCUITREFERENCE DESCRIPTION PART NO.3. Capacitors (Continued)C50,56,57 CAP CHIP 3p3 0.25p 50V 3301-0007C51,89,113,132,133 CAP CHIP 47p 5% 50V 3301-0029C58 CAP CHIP 6p8 0.25p 50V 3301-0011C59 CAP CHIP Op75 0.25P 50V 3301-0251C65 CAP AL 1000F -10+50% 40V 3402-0001C69 CAP CHIP 2n2 10% 50V 3301-0104C71,100 CAP POLYTR 330n 10% 63V 3304-0010C81 CAP CER 180p N750 100V 3302-0231C82 CAP CER 150p 2% 100V 3302-0151C83,84 CAP CER 22p 2% 100V 3302-0141C86 CAP CHIP 8p2 0.25p 50V 3301-0012C96,101 CAP PLYPRP 6n8 2.5% 63V 3303-0003C97,120,122 CAP CHIP 180p 5% 50V 3301-0043C98,104 CAP PLYPRP 10n 2.5% 63V 3303-0004C99,103 CAP PLYPRP 4n7 2.5% 63V 3303-0002C105,107,114,115,124,125,126 CAP CHIP 220p 10% 50V 3301-0081C106 CAP PLYPRP 2n2 2.5% 100V 3303-0009C110,112,128,131 CAP CHIP 100n -20+80% 25V 3301-0149C119 CAP AL 100F 20% 6.3V 3401-0084C127,130 CAP CHIP 220p 10% 50V 3301-0081VC1 CAP CHIP TRIM 10p 3506-0002VC2,3,4 CAP VARIABLE 2-10p 3501-0002VC5 CAP VARIABLE 4-40p 3501-00054. Connectors SK1,2 PLUG 2-WAY 4501-0002SK3 SOCKET 2.1mm PCB MOUNT 4431-0012SK4 SKT RF COAX PANEL 4414-0001SOCKET 2-WAY 4501-00015. CrystalsXL1 XTAL GENERIC SPEC 3904XL1 XTAL GENERIC SPEC (HIGH STABILITY) 3905OV1 CRYSTAL OVEN PLC1-27-12-75 6201-00016. DiodesD1 DIODE VARICAP KV1310A-3 DUAL 3701-0027D2 DIODE ZENER CHIP BZX84C10 3703-0017D3,4 DIODE CHIP BAR 18 3703-0004D5 DIODE CHIP BAV99 3703-0001
RPT 633Page 6 - 4TM1184 Issue 1ITEM/CIRCUITREFERENCE DESCRIPTION PART NO.6. Diodes (Continued)D6,7 DIODE ZENER CHIP BZX84C5VI 3703-0010D8 DIODE MV2109 3701-0001D9,10,11 DIODE CHIP BAT54 3703-00447. InductorsL1 COIL MC111 SERIES 4609-0001L2 INDUCTOR 2F2H 4102-0009L3,4 INDUCTOR 470nH 4102-0005L5 INDUCTOR 10TURN 4160-6235L6 AIR COIL 4160-6236L7 AIR COIL 4160-6237L8,9,11,12 INDUCTOR 220nH 4102-0003L10,19,20,21 INDUCTOR 22nH 4102-0050L13 INDUCTOR 100nH 4102-0001L14,15,16 ASSY COIL 605753L17,18 INDUCTOR 1mH 4102-0025L22 INDUCTOR 6F84107-00028. Integrated CircuitsIC1 IC 560CDP 3803-0003IC2 VOLT REG 78L82AWC 95520IC3,4 VOLT REG 7812C 6001-0002IC5 VOLT REG 7805 6001-0001IC6 IC 74HCTO5 3819-0014IC7 IC 14568BCP 3802-0001IC8 IC HEF4069 SMD HEX INVERTER 3819-0007IC9 IC SP4660DP 3803-0001IC10,12 IC OP. AMP. LM348D 3819-0003IC11 IC 7661 3803-0025IC13 IC OP AMP MC 1458ND 3818-0001IC14 VOLTAGE REG ICL8069.REF:1.2V 6002-00269. LinksLK1,2,3 2-WAY JUMPER LINK (GOLD PLATED) 4408-0001
RPT 633TM1184 Issue 1Page 6 - 5ITEM/CIRCUITREFERENCE DESCRIPTION PART NO.10. ResistorsR1 RES CHIP 15k 5% 0.125W 3101-0174R2,12,17,63 RES CHIP 2k2 5% 0.0625W 3105-0179R3,52,96 RES CHIP 68R 5% 0.0625W 3105-0143R4,6,9,14,24,47,61,62,80,87 RES CHIP 6k8 5% 0.0625W 3105-0191R5,7,8,64,73 RES CHIP 33k 5% 0.0625W 3105-0207R10,26,59,90 RES CHIP 560R 5% 0.0625W 3105-0165R11 RES CHIP 22R 5% 0.0625W 3105-0131R13 RES CHIP 3k3 5% 0.125W 3101-0158R15,45,86 RES CHIP 15k 5% 0.0625W 3105-0199R16,67,68,69,79,100 RES CHIP 10k 5% 0.0625W 3105-0195R18,19,37 RES CHIP 220R 5% 0.0625W 3105-0155R20 RES CHIP 3k9 5% 0.0625W 3105-0185R21 RES CHIP 10R 5% 0.125W 3101-0098R22 RES CHIP 100R 5% 0.125W 3101-0122R23,25,29,74,109,115 RES CHIP 4k7 5% 0.0625W 3105-0187R27,34 RES CHIP 47R 5% 0.0625W 3105-0139R28,39,40,99 RES CHIP 33R 5% 0.0625W 3105-0135R30,33,106 RES CHIP 470R 5% 0.0625W 3105-0163R31 RES CHIP 15R 5% 0.0625W 3105-0127R32,91 RES CHIP 1k2 5% 0.0625W 3105-0173R35,104 RES CHIP 10R 5% 0.0625W 3105-0123R36 RES CHIP 18k 5% 0.0625W 3105-0201R41,42 RES MF 100R 1% 0.6W 3103-0188R43,53,58,117,119 RES CHIP 100R 5% 0.0625W 3105-0147R44,84,124 RES CHIP 22k 5% 0.0625W 3105-0203R46,107,111,114,121,123 RES CHIP 1k0 5% .0625W 3105-0171R48 RES CHIP 7k5 5% 0.0625W 3105-0192R49 RES CHIP 1k5 5% 0.0625W 3105-0175R50 RES CHIP 56k 5% 0.0625W 3105-0213R51,55,56,57,83 RES CHIP 39k 5% .0625W 3105-0209R54 RES MF 4R7 1% 0.6W 3103-0156R60 RES CHIP 330R 5% .0625W 3105-0159R66,75,77,97 RES CHIP 47k 5% .0625W 3105-0211R65,72,88 RES CHIP 82k 5% .0625W 3105-0217R76,89 RES CHIP 68k 5% 0.0625W 3105-0215R81,85 RES CHIP 8k2 5% .0625W 3105-0193R82 RES CHIP 27k 5% .0625W 3105-0205R92,101 RES CHIP 100k 5% 0.0625W 3105-0219R93,94,98 RES CHIP 2k7 5% 0.0625W 3105-0181R95 RES CHIP 330k 5% 0.0625W 3105-0231
RPT 633Page 6 - 6TM1184 Issue 1ITEM/CIRCUITREFERENCE DESCRIPTION PART NO.10. Resistors (Continued)R102 RES CHIP 820R 5% .0625W 3105-0169R103,110,113,122 RES CHIP 10k 5% 0.0625W 3105-0195R105 RES CHIP 1k8 5% 0.0625W 3105-0177R108 RES CHIP 6k8 5% .0625W 3105-0191R116 RES CHIP 3k3 5% 0.0625W 3105-0183R118,120 RES CHIP 150R 5% .0625W 3105-0151TH1 THERMISTOR 10k 3211-0002RV1 POT CERMET 100R 3202-0001RV2 POT MULTITURN 10k 3208-0010RV3 POT MULTITURN 5k 3208-0009RV4 POT CERMET 2k2 3202-000511. Transducer LS1 TRANSDUCER 5001-000112. TransformerT1 ASSY TRANSFORMER 0460-622213. TransistorsTR1,13,14 TRANS BCW61C 3602-0018TR2 TRANS MMBFU 310 3602-0008TR3,12 TRANS BCW33 3602-0010TR4,6 TRANS BFS 17 3602-0001TR5 TRANS BCW31 3602-0011TR7,8 TRANSISTOR BFR96-02 3601-0001TR9 TRANSISTOR MRF559 3601-0003TR10 TRANSISTOR MRF630 3601-0012TR11 TRANSISTOR BFS19 3602-000314. AntennaANTENNA RPE303 5501-0001FLEXIBLE STRAIGHT ANTENNA 5501-0002
RPT 633TM1184 Issue 1Page 6 - 7ITEM/CIRCUITREFERENCE DESCRIPTION PART NO.BANDED COMPONENTS15. FiltersFL1,2 FILTER HELICAL 252-MX-1547A BAND 14605-0005FL1,2 FILTER HELICAL 252-MX-1549A BAND 24605-0006FL1,2 FILTER HELICAL 252-MX-1551A BAND 34605-000716. CapacitorsC6 CAP CER 10p 0.25p 63V BAND 13302-0099C6 CAP CER 10p 0.25p 63V BAND 23302-0099C6 CAP CER 8p2 0.25p 63V BAND 33302-0098VOX KEYING MODULE COMPONENTS17. CapacitorsC1 CAP AL 22FF 20% 16V 3401-0008C2,3,5,6,7 CAP POLYTR 100n 10% 63V 3304-0002C4 CAP POLYTR 220n 10% 63V 3304-0009C8 CAP AL 10F 20% 35V 3401-010018. ConnectorPL1 8-WAY PLUG RT ANGLED 4303-004419. DiodesD1,2 DIODE 1N4148 17535D3 INDICATOR LED HLMP1700 3704-001120. Integrated CircuitsIC1 IC 4538 3802-0043IC2 IC 74HC107 3801-0049IC3 IC 74HCO2 95993
RPT 633Page 6 - 8TM1184 Issue 1ITEM/CIRCUITREFERENCE DESCRIPTION PART NO.21. Resistors R1 RES MF 39k 1% 0.6W 3103-0250R2 RES MF 10k 1% 0.6W 3103-0236R3 RES MF 680R 1% 0.6W 3103-0208R4 RES MF 100k 1% 0.6W 3103-0260R5 RES MF 1k5 1% 0.6W 3103-0216R6 RES MF 47k 1% 0.6W 3103-0252RV1 POT CERMET 2k2 3202-0005RV2,3 POT CERMET 220k 3202-001122. TransistorTR1 TRANSISTOR BC183L 95785
TM 1184 Issue 1 AL1 (May 1997) Page A1 - 1 APPENDIX 1 UHF SERIAL ENCODER MODEL RPE 673CONTENTS1. INTRODUCTION2. ROLE3. PHYSICAL CONSTRUCTIONSPECIFICATION4. Encoder5. Connectors7. OPERATING INSTRUCTIONS8. TECHNICAL DESCRIPTIONPRE-INSTALLATION CHECKS13. Unpacking14. Tools required15. Test Equipment requiredINSTALLATION PROCEDURE16. Wall Mounting17. Software Configuration24. Parameter Definitions26. Connecting the External Device30. Audio Connection31. Direct Line Contacts (DLCs)35. Antenna
RPE 673 TM 1184 Issue 1 AL1 (May 1997)Page A1 - 2CONTENTS (Continued)SERVICING37. Repair Policy39. Removal / Re-fitting of Circuit Boards44. Transmitter Alignment - Initial settings46. Setting up the Phase Lock Loop47. Transmitter Alignment48. Setting Data Deviation and Centre Frequency49. Setting Analogue Deviation50. FAULT FINDING51. ANTENNA CUTTING52. SPARE PARTS LISTTABLES Page1. Encoder SK1/SK2 Pin Outs A1 - 122. P910 Connections A1 - 123. P911 Connections A1 - 134. DLC Connections A1 - 145. Data Deviation A1 - 216. Analogue Deviation A1 - 22FIGURES1. Encoder Connections A1 - 52. Wall Mounting Template A1 - 73. Set-up Menu A1 - 84. P910/P911 Connector Pin Layout A1 - 135. External Connections A1 - 156. Serial Encoder - Service Layout A1 - 167. Transmitter PCB Layout A1 - 188. Test Menu Options A1 - 209. Serial Encoder Interconnection Diagram A1 - 24
TM 1184 Issue 1 AL1 (May 1997) Page A1 - 3INTRODUCTION1. This Appendix outlines the installation and operation of the Radio PagingSerial Encoder (Transmitter/Encoder) model RPE 673. The Serial Encoder utilises theexisting RPT 633 Transmitter PCB and, whenever necessary, reference is madeto the appropriate section in the main body of this manual.ROLE 2. The Multitone RPE 673 is a single channel radio paging Serial Encoder operating in theUHF frequency band. The Serial Encoder provides paging facilities for Mk6 or Mk7 codeformat alphanumeric and speech radio paging systems. The Serial Encoder can be usedto call up to 10,000 radio paging receivers.PHYSICAL CONSTRUCTION3. The RPE 673 consists of an Encoder PCB combined with a 2.5W TransmitterPCB (as used in RPT 633) together in one moulded plastic housing.SPECIFICATIONNOTE:For Transmitter characteristics and crystal frequency calculation refer toSection 1.Encoder4. The performance characteristics of the Encoder are as follows:a) Protocol: ESPA 4.4.4. or MEP (Determined by firmware) b) Code Format: Multitone Mk6 or Mk7 (Programmable)c) Paging Addressees: 10,000d) Beep Codes: Eighte) Message Transmission: Up to 60 alphanumeric charactersf) Speech Transmission: Duration is unlimited and under the control of theExternal Device (speech is applicable only whenESPA 4.4.4. protocol is used)
RPE 673 TM 1184 Issue 1 AL1 (May 1997)Page A1 - 4Connectors5. The RPE 673 Serial Encoder is fitted with the following external connectors:a) SK1: Audio Input Two pin moulded socket (600 Ohm)b) SK2: Not Usedc) SK3: Power Supply Unit Four-way FCC68 socketd) SK4: Antenna TNC (50 Ohm)6. In addition, the following internal connectors are fitted to the Encoder PCB:a) SK1: Serial Data input Eight-way FCC68 socketb) SK2: Serial Data input Four-way IDCc) SK3: Remote DLCs 1-4 Four-way IDCd) SK5: Remote DLCs 5-8 Four-way IDCe) SK4: Ground for RS232 / DLCs Four-way IDCRS485 Data I/P (Not used)NOTE: Physical Characteristics, Operational Environment and Power SupplyOptions are identical to the RPT 633.OPERATING INSTRUCTIONS7. The Radio Paging Serial Encoder is fully automatic in use and operation is limited toswitching on the mains supply.
ENCODERTRANSMITTERPSUAUDIO (SK1)RS232 DATAMODETxRxRTSCTSTx KEYDATABEEPGND (SK4)SK3(SK1 or SK2)POWER (SK3)PL1PL1ANTENNASK4TL9TL8TL2 TL1P4 P5 P7 P6TAG10817-16823SK5RV1 - AUDIO ADJUSTDLCs 1 - 83286POWER1TM 1184 Issue 1 AL1 (May 1997) Page A1 - 5Figure 1: Encoder ConnectionsTECHNICAL DESCRIPTIONNOTE: For a circuit description of the Transmitter, refer to Section 3.8. The RPE 673 Serial Encoder provides a communications link between any device with a standard RS232 data output and up to 10,000 paging receivers. Valid data isprocessed by a purpose built digital Encoder and fed to a 2.5W UHF Transmitter (basedupon the RPT 633) for onward transmission.9. The Encoder is driven by the serial RS232 data input (SK1 or SK2) and the eight DLCinputs (SK3 and SK5) using ESPA 4.4.4 or MEP protocol (as determined by firmware).Receipt of serial data or closure of any DLC causes the Encoder to enter the callgeneration routine. A paging transmission is assembled in either Mk6 or Mk7 paging codeformat. The format is selected during installation (refer to paragraph 24).10. The eight DLC inputs may be used for remotely sited contacts which must close to initiatepaging calls. The DLC paging messages can be configured during installation (refer toparagraph 24).11. Figure 1 illustrates Encoder input / output connections. Power (+5V) is supplied to theEncoder PCB from the Transmitter PCB on PL1-1 and ground is PL1-7.12. The Encoder PCB also contains circuitry for the signal conditioning of the audio/speechinput to the Serial Encoder. PL2 on the Encoder PCB is for factory test purposes only.
RPE 673 TM 1184 Issue 1 AL1 (May 1997)Page A1 - 6PRE-INSTALLATION CHECKSCAUTIONSTATIC SENSITIVE DEVICES ARE USED WITHIN THIS EQUIPMENT.OBSERVE STATIC SAFETY PRECAUTIONS.Unpacking13. Unpack the container and examine the contents against the list given below:a) RPE 673 Serial Encoder Unit Qty 1b) Power Supply Unit, 3-pin plug (UK) or 2-pin (Europe) Qty 1c) Antenna Assembly * Qty 1d) Socket, 2-way (4501-0001) Qty 2*Supplied only when requested on Sales Specification FormTools Required14. The following tools will be required:a) Screwdrivers - Flat and Cross-Pointb) IDC Insertion ToolTest Equipment Required15. The following test equipment will be required:a) PC with RS232C serial portb) P910 Cable Assembly, 9-Way, D-Type orP911 Cable Assembly, 25-Way, D-Typec) 4404-0003 Interconnect Flexible
155 mmTAG 10821-1TM 1184 Issue 1 AL1 (May 1997) Page A1 - 7Figure 2: Wall Mounting TemplateINSTALLATION PROCEDUREWall MountingCAUTIONENSURE THE UNIT IS MOUNTED IN A DRY ENVIRONMENT. DO NOT MOUNTTHE UNIT OVER A HEAT SOURCE OR IN DIRECT SUNLIGHT. 16. The unit may be mounted on a suitable horizontal shelf or wall-mounted using thefollowing procedure:a) Referring to Figure 2 (or using the template supplied with the Serial Encoder), drillholes to accept 8mm plugs and screws.b) Fit the plugs into the holes and insert the screws into the plugs leaving 5mmclearance between the screw heads and the wall.c) Remove the four rubber feet from the base and slot the Serial Encoder onto the screwheads.NOTE:It may not be possible to carry out the Software Configuration using aPC whilst the External Device is connected. It is recommended thatthe Software Configuration is carried out before connecting the ExternalDevice.
F - Set Code (F)ormatT-Set (T)ime-of-Day OptionP - Change Serial (P)ort Settings1-8 - Edit DLC 1 - 8Setup=====Serial Port: 1200 Baud, 7 Data Bits, 2 Stop, Even ParitySerial Protocol = MEP Options: Timeout = 1Code Format: Mk 7 System Address: 0 Time-of-Day: Off Time-of-Day User No: 1234DLC Rx No BC Message-------------------------------------------------------1 1111 2 ‘Message 1'2 1230 1 ‘Message 2'3 333G 1 ‘Message 3'8 8910 1 ‘Message 8'..Choose:-S - Set (S)ystem AddressU - Set Time-of-Day (U)serO - Change Serial Protocol (O)ptionsQ - (Q)uit4 45GG 1 ‘Message 4' ..FIRMWARE M670101RPE 673 TM 1184 Issue 1 AL1 (May 1997)Page A1 - 8Figure 3: Set-up MenuSoftware Configuration17. To gain access to Encoder socket SK1, remove the two cross-point screws from therear of the unit. Lift the cover slightly (it will only clear the base by 4 to 5 inches). Carefullydisconnect the 8-way flexi-cable from PL1 of both Transmitter and Encoder. Pivoting onits front edge, invert the cover and slide it under the base. Fit test cable 4404-0003 to PL1of Transmitter and Encoder.18. Connect the serial port of your PC to SK1 (FCC 68) of the Encoder PCB using theP910 or P911 cable. If using Windows 95, run Hyper-Terminal; if using Windows 3.1,run Terminal.Exe. Configure your serial port as follows: 9600 Baud, 8 Data bits,2 Stop bits, no Parity bit, Flow Control = Hardware. 19. Connect the external power supply to SK3 of the Serial Encoder. Power up the Serial Encoder, wait 3 seconds and, within a further 10 seconds, press <Enter>; the(S)et-up / Test Menu should appear on the VDU. Select (S)et-up; the Setup menu should appear on the VDU (see Figure 3). 20. Having accessed the Set-up Menu the following parameters may be set:F-Code Format S-System AddressT-Time-of-Day Option U-Time-of-Day UserP-Serial Port Settings O-Serial Protocol Options 1 - 8 -Edit DLCs Q-Quit
TM 1184 Issue 1 AL1 (May 1997) Page A1 - 921. Definitions for each parameter are given in paragraph 24.22. Once a setting has been selected, the following message will be displayed:‘....Writing to Eeprom - please wait.....Done’and the Set-up screen will again be displayed. 23. For Serial Port Settings however, parameters are not written to the Eeprom until‘W’ (Write to Eeprom) is selected from the Serial Port Set-up Menu.Parameter Definitions24. The Parameter Definitions are as follows:DLC Each DLC has a configurable Receiver Number (Rx No), Beep Code (BC) andConfiguration Message.a) Rx No Four digit code in the range 0000 - 9999. The Rx No will beautomatically prefixed with the System Address to form the RIC.Group calls may be initiated in order to call a group of pagingreceivers within a specified range of addresses by inserting thewildcard character ‘G’ into the Rx No.If one wildcard character is included as the least significant digitthen a group of 10 receivers will be called, eg: ’333G willcall receivers ’3330 to ’3339 (where ’ = SystemAddress).If two wildcard characters are included as the two least significantdigits then a group of 100 receivers will be called, eg: ’45GGwill call receivers ’4500 to ’4599 (where ’ = System Address). b) Beep Single digit in the range 1 - 8Codec) Message Mk6: Maximum length of 10 characters in the range 0 - 9,(hyphen) and <Space>. Mk7: Maximum length of 60 characters in the standard ASCIIcharacter set ie,<Space> (Hex 20) through to ‘~’ (Hex7E).Serial Port These parameters are for the V24/RS232 port and are set to match theSettings External Device to which the Serial Encoder is connected. The selections are selfexplanatory however, once the settings have been made, they must bewritten to the Eeprom by entering ‘W’ ([W]rite changes to Eeprom).NOTE: During set-up and test, the Serial Encoder communicates using a fixedset of parameters (9600 Baud, 8 Data Bits, 2 Stop Bits, No Parity Bit).The above Serial Port Settings only take effect during normal operation.
RPE 673 TM 1184 Issue 1 AL1 (May 1997)Page A1 - 10Serial Protocol a) MEP: The only serial option for MEP protocol is the Timeout setting:Options Setting Timeout Setting Timeout0100 ms 4 4 seconds1 1 second 5 5 seconds2 2 seconds 6 6 seconds3 3 seconds 7 7 secondsNOTE: The Timeout settings are designed to allow flexibility inthe response times from different external devices.b) ESPA: There are two options: <Turn-Round / Response Time’ and <SuppressResponse Option’.i) Turn-Round / Response Time:Setting Turn-Round Time Response Time0approx 10ms 150ms130 - 40 ms 300ms2100ms 3s31s 10sNOTE: Turn Round time is a delay introduced beforetransmission allowing intervening hardware, such asconvertors or modems, to change configuration ordirection. Missed Response time is the period after transmissionthat the RPE 673 waits for an acknowledgement. ii) Suppress Response - Valid input is <0’ (disabled) or <1’(enabled). When enabled, the automatic responses back tothe External Device from the RPE 673 will be suppressed (notsent).NOTE: Suppression is beneficial if the operation of theRPE 673 is slow.Code Format Determines the digital data format (Mk6 or Mk7) to be sent by the Serial Encoder.Valid input is ‘6’ or ‘7’.System Address A single numeric digit which must match the most significant digit of the ReceiverIdentification Code (RIC) for the corresponding paging receiver. Valid input is 0 - 9for Mk6 and 0 - 3 for Mk7.Time-of-Day If set to ‘1’ (on) then Time-of-Day paging calls will be sent at one-minute intervalsOption and, Mk7 paging calls will contain an updated time-stamp.If set to ‘0’ (off) then Time-of-Day calls will not be sent and, Mk7 calls will containa fixed time-stamp.
TM 1184 Issue 1 AL1 (May 1997) Page A1 - 11Time-of-Day This is a dummy User / Receiver which is used to allow the Time and/or DateUser Number to be set. If a call is sent to this receiver then the message content is used to setthe system Time and/or Date as follows:a) To set the Time, the Time-of-Day User is called with a 4-digit message in theform: ‘HHMM’ where:HH represents the Hours digits (00 - 23)MM represents the Minutes digits (00 - 59)b) To set the Date (Mk7 only), the Time-of-Day User is called with a 6-digitmessage in the form: ‘YYMMDD’ where:YY represents the last two digits of the Year (00 - 99)MM represents the Month of the Year (01 - 12)DD represents the Day of the Month (01 - 31) c) As an alternative, a 10-digit numeric message in the form <<YYMMDDHHMM’will set both Time and Date together.NOTE: Mk6 paging receivers must be programmed with System Size set to ‘10,000’ and System Type set to ‘Other’.25. Once set-up is complete, turn off the power supply and disconnect the PC.
RPE 673 TM 1184 Issue 1 AL1 (May 1997)Page A1 - 12Connecting the External Device26. Connection of the External Device to the RS232 port on the Encoder can be madein on eof two ways:a) Connecting the P910 or P911 to Encoder SK1.b) Connecting an alternative cable to the Krone connections on Encoder SK2.27. Note that Encoder SK1 and SK2 are connected in parallel; only one socket can be utilised. 28. Pin out details of Encoder sockets SK1 and SK2 are shown in Table 1.Table 1: Encoder SK1 / SK2 Pin Outs SK1 (FCC 68) SK2Pin 1 Ground Pin 1 CTSPin 2 TxD Pin 2 RTSPin 3 RxD Pin 3 RxDPin 4 CTS Pin 4 TxDPin 6 RTSNOTE: If connecting the External Device to SK2, a return connection (signal ground) should be made to 0V on SK4 (pin 1 or pin 2) of the Encoder PCB.29. Connection details for cable assemblies P910 and P911 are shown in Tables 2 and 3.Pin layout is illustrated in Figure 4.Table 2: P910 Connections8 Way Modular Jack Plug 9 Way D-Type ConnectorPin 1 Pin 5 Signal Ground Pin 2 Pin 2 Transmit Data Pin 3 Pin 3 Receive Data Pin 4 Pin 7 CTS Pin 5 Pin 6 N.C. Pin 6 Pin 8 RTS Pin 7 Pin 4 N.C. Pin 8 Pin 1 N.C. N.C. = Not Connected
8 WAY MODULARJACK PLUG (P910/911)PIN 1 PIN 8TAG 10829-1PIN 25PIN 125 WAY D-TYPECONNECTOR (P911)PIN 19 WAY D-TYPECONNECTOR (P910)PIN 9TM 1184 Issue 1 AL1 (May 1997) Page A1 - 13Figure 4: P910/P911 Connector Pin LayoutsTable 3 : P911 Connections8 Way Modular Jack Plug 25 Way D-Type ConnectorPin 1 Pin 7 Signal Ground Pin 2 Pin 3 Transmit Data Pin 3 Pin 2 Receive Data Pin 4 Pin 4 CTS Pin 5 Pin 6 N.C. Pin 6 Pin 5 RTS Pin 7 Pin 20 N.C. Pin 8 Pin 8 N.C. N.C. =Not Connected
RPE 673 TM 1184 Issue 1 AL1 (May 1997)Page A1 - 14Audio Connection30. If required, the audio output from the External Device should be connected to SerialEncoder SK1 using the 2-Way Socket, Part No. 4501-0001 (provided) and suitable cable(RV1 on the Encoder PCB may be adjusted to compensate for the output level providedby the audio source at the customer’s premises).Direct Line Contacts (DLCs)31. DLCs can be a door bell push, a security alarm, a sensor on a piece of machinery etc.Contacts must close to initiate a paging call and should be connected to the SerialEncoder by a twisted-pair wire. 32. The loop resistance of each DLC connection must not exceed 150 S.33. DLC connections are listed in Table 4. Return connections are made to 0V on SK4(pin1 or pin 2) of the Encoder PCB.Table 4: DLC ConnectionsSK3SK5Pin 1 DLC 1 Pin 1 DLC 5Pin 2 DLC 2 Pin 2 DLC 6Pin 3 DLC 3 Pin 3 DLC 7Pin 4 DLC 4 Pin 4 DLC 834. Remove the Interconnect Cable 4404-0003 and re-fit the flexi-cable to PL1 of Transmitterand Encoder. Replace and secure the cover.Antenna35. Following the manufacturer’s instructions, connect the antenna to SK4.36. If using the Whip Antenna, stand the antenna on a flat surface and lay the connectinglead as straight as possible to the Serial Encoder. The best transmission will beachieved with the antenna as high as possible and preferably stood on a metal surfacesuch as a filing cabinet. This will achieve a good ground-plane.
TM 1184 Issue 1 AL1 (May 1997) Page A1 - 15Figure 5: External Connections
TAG10830-1RPE 673 TM 1184 Issue 1 AL1 (May 1997)Page A1 - 16Figure 6: Serial Encoder - Service Layout
TM 1184 Issue 1 AL1 (May 1997) Page A1 - 17SERVICINGRepair Policy37. The following service policy applies to the RPE 673:a) The Encoder PCB and the Encoder firmware device (IC2) are disposable modules;both are available as service spares.b) The Transmitter PCB is repairable to component level (for part numbers, refer toSection 6).38. Transmitter alignment procedures (paras 45 - 49) rely on the use of a PC forTransmitter keying. For alignment procedures without the use of a PC, referto Section 5. Removal / Re-fitting of Circuit Boards39. Disconnect the antenna and connectors from the rear of the case. At the rear ofthe unit unscrew and remove the two retaining screws. Lift the cover slightly (it will onlyclear the base by 4 to 5 inches). Carefully disconnect the 8-way flexi-cable from PL1of the Transmitter. Pivoting on its front edge, invert the cover and slide it under thebase. 40. To remove the Encoder board, de-solder the two screened cables from P4, P5, P6and P7 of the Encoder PCB (see Figure 6). Remove the four screws to release theEncoder PCB. 41. When replacing a suspect Encoder PCB with a service replacement PCB,proceed as follows:a) Remove the suspect Encoder PCB.b) Remove the replacement Encoder PCB from its packaging.c) Carefully transfer the firmware device (IC2) from the suspect Encoder PCB tothe replacement Encoder PCB.d) Fit the service replacement Encoder PCB.e) Carry out the Set-up procedure detailed in paras 18 - 25.42. To Remove the Transmitter board, de-solder the two screened cables from TL1, TL2, TL8and TL9 of the Transmitter board (see Figure 6). Remove the four securing nuts torelease the Transmitter PCB.43. Re-assembly is the reverse of dismantling. Replace the 8-Way flexi-cable (removed inparagraph 39) before re-fitting the cover.
TL9RV1TL3TL2TL1TP9TP11TP10RV4TP8RV2TP7LK3RV3TL6TP2TL7VC4 VC2TP3LK2LK1 L1VC3VC5VC1 TP13TP12TP14TP5TP6TP15TP14TP1FL2FL1PL1TL8SK1SK2SK3RPE 673 TM 1184 Issue 1 AL1 (May 1997)Page A1 - 18Figure 7: Transmitter PCB LayoutPSG10532-1
TM 1184 Issue 1 AL1 (May 1997) Page A1 - 19Transmitter Alignment - Initial Settings44. Refer to Figure 7. Set the variable components and links as follows:VC1 -Anywhere.VC2 -Half Meshed.VC3 -Fully Un-meshed.VC4 -Fully Un-meshed.VC5 -25% Meshed.FL1 and FL2 - Adjusters standing proud by 2mm.RV1 -Fully Anti-clockwise.RV2 -Mid Position (15 turns from either end).RV3 -AnywhereRV4 -Mid PositionLK1 -Position 2-3 (Normal Version).Position 1-2 (FTZ Version).LK2 -Position 1-2 (Bands 1 and 2).Position 2-3 (Band 3).LK3 -Position 2-3 (Normal Operation).Position 1-2 (Invert Data Sense).45. Set up the test equipment as follows:a) Disconnect the external audio input from SK1 on the Transmitter PCB.b) Connect the absorption wattmeter or power meter to the antenna socket using alead no longer than 300mm.c) Connect the modulation meter and frequency counter to the attenuatedoutput.d) Connect the power supply to SK3.e) Connect the audio signal generator to Serial Encoder SK1.f) Connect the serial port of your PC to SK1 (FCC 68) of the Encoder PCB usingthe P910 or P911 cable. If using Windows 95, run Hyper-Terminal; if usingWindows 3.1, run Terminal.Exe. Configure your serial port as follows: 9600 Baud,8 Data bits, 2 Stop bits, no Parity bit, Flow Control = Hardware.g) Connect the external power supply to SK3 of the Serial Encoder.
Set-up / Test Menu===============T - (T)est MenuS - (S)et-up MenuQ - (Q)uit T - (T)ransmitter TestsF - (F)ull TestQ - (Q)uit Transmitter Test MenuM - Key up Transmitter - (M)arkingS - Key up Transmitter - (S)pacingP - Key up Transmitter - (P)reambleA - Key up Transmitter - (A)nalogueQ - (Q)uit==================TAG 10827-1RPE 673 TM 1184 Issue 1 AL1 (May 1997)Page A1 - 20Figure 8: Test Menu Optionsh) Power up the Serial Encoder, wait 3 seconds and, within a further 10 seconds,press <Enter> on the Terminal keyboard; the Set-up / Test Menu shouldappear on the VDU (see Figure 8).j) Select (T)est Menu.NOTE: The Transmitter Tests are used to key the Transmitter duringalignment, Full Test is for factory use only.Setting up the Phase Lock Loop46. Set up the Phase Lock Loop as follows:a) Connect the oscilloscope to TP3.b) Adjust the slug of L1 to give 5V ±0.2V DC at TP3.Transmitter Alignment47. To align the Transmitter carry out the following procedure:a) Connect the oscilloscope to TP7.b) Adjust RV3 to give 0V ±50mV DC at TP7.c) Key up the Transmitter by selecting (A)nalogue.
TM 1184 Issue 1 AL1 (May 1997) Page A1 - 21d) On FL1 and FL2 turn the four adjusters ½ turn at a time until the power meterindicates or the power supply current increases.e) If no power appears slightly adjust VC2 or VC3 and repeat (d).f) Tune the four adjusters of FL1 and FL2 for maximum power.g) Tune VC1, VC2 and VC3 for maximum power and then RV1 to give a power meterreading of 2.5W.h) Re-adjust VC1, VC2 and VC3 for maximum power then RV1 for 2.5W ±0.2W.Setting Data Deviation and Centre Frequency48. To set the Data Deviation and Centre Frequency carry out the following procedure:a) Select (M)arking (continuous ‘1's) from the Transmitter Test Menu. Measure theoutput frequency to the nearest 10Hz.b) Select (S)pacing (continuous ‘0's) from the Transmitter Test Menu and againmeasure the output frequency to the nearest 10Hz.c) Adjust RV2 as necessary until the measurement at (b) differs from themeasurement at (a) by the amount given in the TOTAL DEVIATION column ofTable 5 (within the specified tolerance).d) Using a plastic trimming tool adjust VC5 until the mean of the two frequenciesmeasured at (a) and (b) is within 100Hz of the specified centre frequency of theTransmitter.Table 5: Data DeviationCHANNEL DEVIATION TOTAL TOLERANCESPACING kHz DEVIATIONkHz kHz25 ± 4.5 9± 200Hz20 ± 3.6 7.2 ± 200Hz12.5 ± 2.25 4.5 ± 100Hz10 ± 1.8 3.6 ± 100Hze) Repeat sub-paragraphs (a) to (d) as necessary.f) Select (A)nalogue from the Transmitter Test Menu. Adjust RV3 to give the specifiedcentre frequency of the Transmitter (to a tolerance of ±100Hz).
RPE 673 TM 1184 Issue 1 AL1 (May 1997)Page A1 - 22Setting Analogue Deviation49. To set the Analogue Deviation carry out the following procedure:a) Select (A)nalogue from the Transmitter Test Menu.b) Set the audio generator output to 1.25kHz at a level of -13dBm (approximately11.5mV peak-to-peak as measured on the oscilloscope). Monitor the deviation onthe modulation meter. Adjust RV1 on the Encoder PCB fully clockwise.c) Refer to Table 6(a) and adjust the generator output level to give a deviationcorresponding to the channel spacing. d) Increase the signal generator output level by 20dB and adjust RV4 to give a deviationcorresponding to that given in Table 6(b) (this should be the larger of the Peak ‘+’ orPeak ‘-’ readings on the modulation meter). Table 6: Analogue DeviationCHANNEL DEVIATION DEVIATION DEVIATION DEVIATIONSPACING (a) (b) (c) (d)kHz kHz kHz kHz kHz25 ± 3 ± 4.5 ± 5 ± 4.920 ± 2.4 ± 3.6 ± 4 ± 3.912.5 ± 1.5 ± 2.25 ± 2.5 ± 2.410 ± 1.2 ± 1.80 ± 2 ± 1.9e) Reduce the signal generator level by 20dB and re-adjust its output level to give adeviation corresponding to that given in Table 6(a).f) Increase the signal generator level by 20dB and re-adjust RV4 to give a deviationcorresponding to that given in Table 6(b).g) Vary the signal generator frequency between 300Hz and 2.5kHz and check that thedeviation does not exceed that given in Table 6(c). If it does, tune to the frequencythat gives the maximum deviation and adjust RV4 to give a deviation correspondingto that given in Table 6(d) (this should be the larger of the Peak + or Peak - readingson the modulation meter).h) Adjust RV1 on the Encoder PCB as necessary to compensate for the output levelprovided by the external audio source at the customers premises. j) Remove the signal generator.
TM 1184 Issue 1 AL1 (May 1997) Page A1 - 23FAULT FINDING50. Specific fault finding information is not provided. For Transmitter test points, togetherwith expected signals, refer to Section 5. NOTE: When the Serial Encoder is fitted with MEP firmware, it can be testedusing CITEST.EXE (supplied with the Developers Pack D3NA).ANTENNA CUTTING51. Refer to Section 5.52. SPARE PARTS LISTNOTE: For General Spares and Transmitter PCB components, refer toSection 6.ITEM / CIRCUIT DESCRIPTION PART No. REFERENCE ENCODER PCB 0201-0654IC2 FIRMWARE RPE 671 /673 + ESPA 0501-0175IC2 FIRMWARE RPE 671 /673 + MEP 0501-0179
RPE 673 TM 1184 Issue 1 AL1 (May 1997)Page A1 - 24Figure 9: Serial Encoder Interconnection Diagram

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