RELM Communications RPU416A UHF FM Transceiver User Manual Service Manual

RELM Communications Inc UHF FM Transceiver Service Manual

Service Manual

1CONTENTSGeneral2Mode Combination3RPU416A Circuit Description4RPU416A Software Description10RPU416A Parts List16RPU416A Adjust Description26Disassembly for Repair30Exploded View31Packing
232RPU416A PC Board View33RPU416A Block Diagram37RPU416A Level Diagram39RPU416A Schematic Diagram41Main Technical Specifications49
3GeneralThis manual is intended for use by experienced technicians familiar with similar types of commercialgrade communications equipment. It contains main required service information and data for theequipment.The following precautions are recommended for personal safety:! DO NOT transmit until all RF connectors are verified secure and any open connectors areproperly terminated.! SHUT OFF and DO NOT operate this equipment near electrical blasting caps or in an explosiveatmosphere.! This equipment should be maintained by qualified technicians only.
4Mode Combination1. ModeUser mode: Turn on the power to enter.PC mode"Set and adjust with PC software or programmer.2. Parts description:(1) Antenna(2) Channel (frequency) selector knobTurn the knob to choose channel from 1~16(channel 16 may be set by distributor as scan channel).(3) LED lightLights red while transmitting, green while receiving a signal. Flashes red when the battery voltage islow while transmitting.(4) Power switch/Volume controlTurn the knob clockwise to switch the transceiver ON, anti-clockwise to turn off the power till there isa “click” sound, rotate to adjust the volume level.(5) Speaker(6) Microphone(7) PTT switch (push to talk)Press the button while transmitting, and release it while receiving.(8) Monitor keyPress it to shut off squelch, noise could be heard, release to connect squelch.(9) Speaker/microphone jack(10) Belt clip(11) Battery (TB-82)RPU416A Circuit Description1. Frequency configurationThe receiver utilizes double conversion. The first IF is 38.85MHz and the second IF is 450kHz. The firstlocal oscillator signal is supplied from the PLL circuit.The PLL circuit in the transmitter generates the necessary frequencies. Fig.1 shows the frequencies.RPU416A frequency range: 450MHz—470MHz
5BCCBANTANTSW RFMCF38.85MHzCF 450KHzSYSTEM AF SPX3 multiplyIFTCXO 12.8MHzMICAMPMICPLLVCORXTXTXAMPPAAMPAMP AMPFig.1 Frequency configuration2. ReceiverThe receiver is double conversion superheterodyne.1) Front-end RF amplifierAn incoming signal from the antenna is applied to a Preamplifier (Q203) after passing through atransmit/receive switch circuit (K102 and D103 are off) and a 3-pole LC filter. After the signal is amplified(Q203), the signal is filtered by a band pass filter (a3-pole LC filter) to eliminate unwanted signals before itis passed to the first mixer. The voltages of these diodes are controlled by to track the MPU. (See Fig. 2-b)BCCBANTD102D103 BPF Q203RF AMPL208-L211 BPFL214.L203.L204 MCFXF200 IF AMPQ201MIXERQ202CF200IF.MIXIC200AF AMPLPF.HPFIC300AF PA AMPIC302SPWIDE/NARROW SWQ303X3multiplyQ1TCXO1st Local OSC(PLL)TUNEAPCIC403MCUFig. 2 Receiver section configuration2) First mixerThe signal from the RF amplifier is heterodyned with the first local oscillator signal from the PLLfrequency synthesizer circuit at the first mixer (Q202) to create a 38.85 MHz first intermediate frequency(1st IF) signal. The first IF signal is then fed through two monolithic crystal filters (MCFs: XF200) to furtherremove spurious signals.3) IF amplifierThe first IF signal is amplified by Q201, and then enters IC 200 (FM processing IC). The signal isheterodyned again with a second local oscillator signal within IC200 to create a 450kHz second IF
6RPU416A Circuit Descriptionsignal. The second IF signal is then fed through a 450kHz ceramic filter (CF200) to further eliminateunwanted signals before it is amplified and FM detected in IC200.4) AF amplifierThe recovered AF signal obtained from IC200 is amplified by IC300 (1/4), filtered by the IC300 low-passfilter (2/4) and IC300 high-pass filter (3/4) and (4/4), and de-emphasized by R303 and C306. The AFsignal is then passed through a WIDE/NARROW switch (Q303). The processed AF signal passes throughan AF volume control and is amplified to a sufficient level to drive a loud speaker by an AF power amplifier(IC302).5) SquelchPart of the AF signal from the IC enters the FM IC again, and the noise component is amplified andrectified by a filter and an amplifier to produce a DC voltage corresponding to the noise level.The DC signal from the FM IC goes to the analog port of the microprocessor (IC403). IC403 determineswhether to output sounds from the speaker, IC403 sends a high signal to the MUTE and AFCO lines andturns IC302 on through Q302, Q304, Q305, Q306 and Q307. (See Fig.3)FM IF IC200IF AMP DETDET HPFAMPIC 300AF AMP LPF HPF Q302SW IC302AF/PF AMP Q307SWSPQ304.Q305.Q306SWQ303W/N SWIC301LPF562676BUSYMUTEAFCOTIIC403MPUFig. 3. AF Amplifier and squelch6) Receiving signalingQT/DQT300 Hz and higher audio frequencies of the output signal from IF IC are cut by a low-pass filter (IC301).The resulting signal enters the microprocessor (IC403). IC403 determines whether the QT or DQTmatches the preset value, and controls the MUTE and AFCO and the speaker output sounds according tothe squelch results.3. PLL frequency synthesizerThe PLL circuit generates the first local oscillator signal for reception and the RF signal for transmission.1) PLLThe frequency step of the PLL circuit is 5 or 6.25kHz. A 12.8MHz reference oscillator signal is divided atIC1 by a fixed counter to produce the 5 or 6.25kHz reference frequency. The voltage controlled oscillator(VCO) output signal is buffer amplified by Q6, then divided in IC1 by a dual-moduleRPU416A Circuit Descriptionprogrammable counter. The divided signal is compared in phase with the 5 or 6.25kHz reference signal inthe phase comparator in IC1. The output signal from the phase comparator is filtered through a low-passfilter and passed to the VCO to control the oscillator frequency. (See Fig. 4 of Next Page)
7BCDDCBPLL DATAPLL IC IC1I/N 5KHz/6.25KHzPHASECOMPARATORREF OSC12.8MHzI/M 5KHz/6.25KHzCHARGELPFD2.4 Q4TX VCOD1.3 Q3RX VCOQ6BUFF AMPQ5.7T/R SWQ2RF AMPPUMPFig. 4. PLL circuit2) VCOThe operating frequency is generated by Q4 in transmit mode and Q3 in receive mode. The oscillatorfrequency is controlled by applying the VCO control voltage, obtained from the phase comparator, to thevaractor diodes (D2 and D4 in transmit mode and D1 and D3 in receive mode) . The T/R pin is set high inreceive mode causing Q5 and Q7 to turn Q4 off, and turn Q3 on. The T/R pin is set low in transmit mode.The outputs from Q3 and Q4 are amplified by Q6 and sent to the buffer amplifiers.3) UNLOCK DETECTORIf a pulse signal appears at the LD pin of IC1, an unlock condition occurs, and the DC voltage obtainedfrom D7, R6, and C1 causes the voltage applied to the UL pin of the microprocessor to go low. When themicroprocessor detects this condition, the transmitter is disabled, ignoring the push-to-talk switch inputsignal. (See Fig. 5)IC1LDPLL ICD75CR6C1IC403ULMPUFig. 5. Unlock detector circuit4. Transmitter1) Transmit audioThe modulation signal from the microphone is amplified by IC500 (1/2), passes through a preemphasiscircuit, and amplified by the other IC500 (1/2) to perform IDC operation. The signal then passes through alow-pass filter (splatter filter) (Q501 and Q502) and cuts 3kHz and higher frequencies.
8RPU416A Circuit DescriptionThe resulting signal goes to the VCO through the VCO modulation terminal for direct FM modulation. (SeeFig. 6)2) QT/DQT encoderA necessary signal for QT/DQT encoding is generated by IC403 and FM-modulated to the PLLreference signal. Since the reference OSC does not modulate the loop characteristic frequency or higher,modulation is performed at the VCO side by adjusting the balance. (See Fig. 6)MICIC500(1/2)MICAMP PREEMPHASIS IC500(1/2)IDCQ501.502LPF(SPLATTER FILTER)VR501MAXDEV D5.Q4VCOVR500BALANCEX1.IC1REFERENCEOSCQT/DQTIC403TOMUTEQ503SWFig. 6. Transmit audio QT/DQT3) RF amplifierThe transmit signal obtained from the VCO buffer amplifier Q100, is amplified by Q101 andQ102. This amplified signal is passed to the power amplifier, Q105 and Q107, which consists of a 2-stageFET amplifier and is capable of producing up to 4W of RF power (See Fig. 7-b)DCBATitleNumber RevisionSizeAMPQ101.1025TDRIVE AMPQ105FINAL AMPQ107ANT SWD101 LPFANTANT SWD102.103RXQ106SWQ109SW5TIC100APCDETQ103.Q104B SWBAPC5TTH102SWQ1105TQ108SWFig. 7 APC system4) ANT switch and LPFThe RF amplifier output signal is passed through a low-pass filter network and a transmit/receive
9RPU416A Circuit Descriptionswitching circuit before it is passed to the antenna terminal. The transmit/receive switching circuit iscomprised of D101, D102 and D103. D102 and D103 turned on (conductive ) in transmit mode and off(isolated) in receive mode.5) APCThe automatic power control (APC) circuit stabilizes the transmitter output power at a predeterminedlevel by sensing the drain current of the final amplifier Field Effect Transistor (FET). The voltage obtainedfrom the above drain current with a reference voltage which is set using the microprocessor. An APCvoltage proportional to the difference between the sensed voltage and the reference voltage appears atthe output of IC100 (1/2). This output voltage controls the gate of the FET power amplifier, which keepsthe transmitter output power can be varied by the microprocessor which in turn changes the referencevoltage and hence , the output power.6) Terminal protection circuitWhen the thermistor (TH102) reaches about 80", the protection circuit turns on Q110 to protecttransmitting final amplifier (Q107).5. Power supplyA 5V reference power supply [5M] for the control circuit is derived from an internal battery. Thisreference is used to provide a 5V supply in transmit mode [5T] ,a 5V supply in receive mode [5R] , and a5V, supply common in both modes [5C] based on the control signal sentfrom the microprocessor.6. Control systemThe IC403 CPU operates at 7.37MHZ. This oscillator has a circuit that shifts the frequency according tothe EEPROM data.
10RPU416A Software Specifications.Specifications:1. Use mechanical knob to choose from 16 channels.Frequency range: UHF: 450~470MHz2. Monitor3. Auto power saving4. Audio alarm5. Auto squelch control (0~9 level)6. Timing7. Channel space 25kHz/12.5kHz(Wide/Narrow)8. CTCSS & DQT encode9. CTCSS & DQT decode10.Two Tone Signal decode11.Two Tone Signal encode12.Busy channel lock13.Clock frequency deviation14.Scan15.PC mode16.PC modifying mode17.Wire clone18.Manual modifying mode.Description:1. User mode: general radio mode2. PC mode:Make settings through external programmer or PC program software:(1) Receive frequency & Transmit frequency(2) Receive signaling & Transmit signaling(3) Lock busy channel(4) Clock frequency deviation(5) Timing(6) Squelch level selectivity(7) Power saving(8) Audio Alarm(9) Channel space 25kHz/12.5kHz(Wide/Narrow)(10) Monitor mode(11) Scan mode(12) Reset scan mode(13) Scan priority3. PC modify mode:Make settings through external programmer or PC program software:RPU416A Software Specifications(1) Frequency stability(2) RF power(3) Low power alarm(4) Squelch (level 9&3)(5) CTCSS deviation (Wide/Narrow).(6) DQT deviation (Wide/Narrow).(7) Receive sensitivity(low"medium"high)4. Wire Clone:Press MONI to turn on the power , enter wire clone mode 2 seconds later, press PTT,Begin cloning while red lights, finish while light goes out.5. Mode setting:(1) Short cut the SELF on PCB, and turn on the power till “BEEP”.(2) Set channel selector knob to corresponding place according to the model(1-16)
11(3) Press [MONI],then press [PTT], to set the channel, channel data and initial data.(4) Turn off the power, disconnect SELF on PCB to end mode settings.(5) Remarks:The old data(frequency, CTCSS/DQT, channel function) will be deleted once set the newmode by pressing MONI AND PTT , part of the function also would be changed. Therefore, donot set this operation unless change the EEPROM, etc.
13RPU416A Software Specifications(6) TC- 368(2) channel frequency diagram (after setting):1CH 2CH(Central) 3CH(L) 4CH(H)No Model Frequency(MHz) Initial(MHz) IF(MHz) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz) Tx(MHz) Rx(MHz)1 136.000~149.995 140.000 +38.85 143.100 143.100 143.000 143.100 136.000 136.100 149.975 149.9002 150.000~173.995 150.000 +38.85 162.100 162.100 162.000 162.100 150.000 150.100 173.975 173.9003 400.000~419.995 410.000 -38.85 410.100 410.100 410.000 410.100 400.000 400.100 419.975 419.9004 RPU416A 450.000~469.995 450.000 -38.85 460.100 460.100 460.000 460.100 450.000 450.100 469.975 469.9005 350.000~369.995 360.000 -38.85 360.100 360.100 360.000 360.100 350.000 350.100 369.975 369.9006 370.000~389.995 380.000 -38.85 380.100 380.100 380.000 380.100 370.000 370.100 389.975 389.9007 220.000~239.995 230.000 -38.85 230.100 230.100 230.000 230.100 220.000 220.100 239.975 239.9008 240.000~259.995 250.000 -38.85 250.100 250.100 250.000 250.100 240.000 240.100 259.975 259.9009 406.000~429.995 410.000 -38.85 418.100 418.100 418.000 418.100 406.000 406.100 429.975 429.90010 144.000~147.995 145.000 +38.85 146.100 146.100 146.000 146.100 144.000 144.100 147.975 147.90011 336.000~367.995 350.000 -38.85 352.100 352.100 352.000 352.100 336.000 336.100 367.975 367.90012 268.000~395.995 380.000 -38.85 382.100 382.100 382.000 382.100 268.000 268.100 395.975 395.90013 430.000~439.995 430.000 -38.85 435.100 435.100 435.000 435.100 430.000 430.100 439.975 439.90014 438.000~449.995 440.000 -38.85 444.100 444.100 444.000 444.100 438.000 438.100 449.975 449.90015 465.000~494.995 480.000 -38.85 480.100 480.100 480.000 480.100 465.000 465.100 494.975 494.90016 490.000~519.995 500.000 -38.85 505.100 505.100 505.000 505.100 490.000 490.100 519.975 519.900Initialization data of channel are in the above diagram CH1-CH4, the modify frequency is reset to initial data. Frequency of CH5~CH14 are the same with CH1.The signaling of CH5 and CH10 is 67.0Hz; the signaling of CH6 and CH11 is 151.4Hz; the signaling of CH7, CH12 is 250.3Hz; the signaling of CH8 and CH13 is423(DQT); the signaling of CH9 and CH14 is -423(DQT). CH1~CH9 are Wide, CH10~CH14 are Narrow. RPU416A
14RPU416A Software Specifications6. Manual Adjust Mode:Press PTT and MONI simultaneously to turn on the power"enter manual Adjust mode out 3seconds later. Choose the settings by turning the channel selector knob 1-12CH, use PTT(upward) or MONI (downward) to adjust (Notice: MIC shouldn’t be connected with external cablewhile modifying),1~12CH are defined as follows:(1) Frequency stability(2) RF power(3) Low power alarm(4) Receiver sensitivity (center frequency adjust)(5) Receiver sensitivity (low frequency adjust)(6) Receiver sensitivity (high frequency adjust)(7) Squelch (level 9)(8) Squelch (level 3)(9) CTCSS deviation (Wide)(10) CTCSS deviation (Narrow)(11) DQT deviation (Wide)(12) DQT deviation (Narrow)13~16CH are used for adjusting transmitter and receiver. Press PTT to transmit; Press MONIto choose: Wide/Narrow, one Beep sound is Narrow, two Beep sound is Wide. 13~16CH aredefined as follows:(13) center frequency (discrepancy of transmission and receive frequency is 0.1MHz).(14) Lowest frequency (discrepancy of transmission and receive frequency is 0.1MHz).(15) Highest frequency (discrepancy of transmission and receive frequency is -0.075MHz).(16) center frequency: sends 250.3Hz CTCSS signals (discrepancy of transmission and receivefrequency is 0.1MHz).Note:To enter and shut off manual adjust mode by short cut the SELF. Turn on the power, and entersettings mode, the manual function is automatically on. Press [PTT] to disable manual modify. Oncethis function is disabled, this mode is not accessible, kindly suggest disable this mode after adjust.. CPU:CPU control M38034M4Pin No. Portname I/O Function1 TI I Input QT/DQT signal2 BUSY I Input busy signal3 BATT I Detect battery voltage4NCINC5 TO O Output QT/DQT6 BEEP O Beep output7NCINC8 ENC0 I Input encode9 ENC1 I Input encode10 ENC2 I Input encode11 ENC3 I Input encode12 NC I NC13 PTT I [PTT] input ,connect RXD14 TXD O RS-232C outputRPU416A Software Specifications15 RXD I RS-232C inputx16 MONI I [MONI] input17 SELF I Program L: set up mode18 CNVSS I Connect VSS19 RST I Reset20 INT0 I Power detection21 NC I NC22 XIN I Oscillator(7.3728MHz)
1523 XOUT O Oscillator24 VSS I Grounding25 SHIFT O Clock frequency deviation H: unlock26 PABC O MOS FET power H: unlock27 WNRC O Audio referential sensitivity L: narrow28 WNTC O Max deviation H: narrow29 NC I NC30 SDA I/O EEPROM data cable31 SCL O EEPROM clock cable32 UL I Lock circuit detector L: unlock33 DT O Common data output34 CK O Common clock output35 LE O PLL IC H: lock up36 5MC O Power control except CPU and EEPROM L: unlock37 AFCO O AF amplifier H: unlock38 RX O TX/RX VCO H: receive39 GLED O Green light control H: light40 RLED O Red light control H: light41 SAVE O Power saving control H: power saving OFF42 MUTE O Squelch control H: mic squelch L:AF squelch43 5RC O Receiver power control L: unlock44 5TC O Transmitter power control H: unlock45 NC I NC46 NC I NC47 NC I NC48 NC I NC49 NC I NC50 NC I NC51 NC I NC52 NC I NC53 NC I NC54 NC I NC55 VCCN O Frequency output56 APC O TX:auto frequency output RX:BPF tune output57 VCC I CPU input power 5V58 VREF I Connect with VCC59 AVSS I Connect with VSS60 NC I NC61 NC I NC62 NC I NC63 NC I NC64 TIBI I QT/DQT exterior circuit central point input
16RPU416A Adjust DescriptionUse programmer or PC software to program RPU416A, or by manual program, refer to”RPU416Asoftware description ” for the manual program and mode settings.. Instrument:1. Synthesized test instrument 1 set2. Scanner 1 set3. 3A/10V power 1 set4. Digital Voltmeter 1 set5. 3A DC Ammeter 1 set. Adjust:1. Initialization"It is necessary to initialize the transceiver because there is useless data in EEPROM. Short cut theSELF on PCB, turn on the power till there comes the sound ”BEEP”, place the channel selectorknob, press [MONI], then press [PTT], to begin initializing the channel and other data. Please referto the outcome of initialization at”RPU416A software description”.2.Adjustment:The adjustment of RPU416A, some are conducted in normal mode, some are in manual programmode. Turn on the power and enter the normal mode., at the same time, press the PTT and MONIto turn on the transceiver"enter the manual program mode 3seconds later.(refer to”RPU416Asoftware description” manual program mode).VCO SECTION:measurement AdjustmentITEM CONDITION Test equip terminal part MethodSpecifications/Remarks1.Setting 1.power 7.5V1.CH: TX HIGH 3.7V±0.1V2.TransmitVCO lockvoltage 2.CH: TX LOW check RPU416A >1V1.CH: RX HIGH 3.7V±0.1V3.ReceiveVCO lockvoltage 2.CH: RX LOWDigitalVolt meter CV TC1check RPU416A>1VNote:If unlock VCO, check adjustment is enabled in manual mode.(signal could be transmitted regardless of thelock of VCO in manual mode).
17RPU416A Adjust DescriptionAdjust the receiver section: (enter manual mode)Measurement AdjustmentItem Condition Test equip Terminal parts Method Specifications/Remarks1:CH:RX centerturn to channel 4 inmanual modeTC202TC203Adjust the undee to the top,the bandwidth is about10MHz, the sign of centralfrequency is in the middle ofthe undee2. CH: RX LOWturn to channel 5 inmanual modePTT(up)MONI(down)Adjust the undee to the top toreceiveLow frequency , the sign is onthe left of the top of the undee4.Band-passfilter3.CH:RX HIGHturn to channel 6 inmanual modeSpectrumanalyzer ANT . TP2PTT(up)MONI(down)Adjust the undee to the top toreceiveHigh frequency , the sign is onthe right of the top of theundee1. CH:RX centerTurn to channel 13 inmanual modeDev : Wide2. CH: RX centerTurn to channel 14 inmanual modeDev : Wide5.Sensitivity(Wide)3. CH: RX centerTurn to channel 15 inmanual modeDev : WideSyntheticaltestSSG output :-118dBmMOD:1kHzDEV:±3kHzFILER: 0.3-3.4kHzANTSP check SINAD: 12dBor higher1. CH: RX centerTurn to channel 13 inmanual modeDev : narrow2. CH: RX centerTurn to channel 14 inmanual modeDev : narrow6.Sensitivity(Narrow)3. CH: RX centerTurn to channel 15 inmanual modedev : narrowSyntheticaltestSSG output :-116dBmMOD:1kHzDEV:±1.5kHz FILER:0.3-3.4kHzANTSP check SINAD: 12dBor higher1.CH: RX centerTurn to channel 7 inmanual modeSyntheticaltest SSGoutput : -117dBmLevel 9Adjust to close the squelch. The squelchmust be closed7.Squelch2.CH:RX centerTurn to channel 8 inmanual modeSyntheticaltest SSGoutput : -125dBmANTSPPTT(up)MONI(down) Level 3Adjust to close the squelch. The squelchmust be closed
18RPU416A Adjust DescriptionAdjust the transmitter section:Measurement AdjustmentItem Condition Test equip Terminal Parts MethodSpecifications/Remarks8.TransmitfrequencyCH: TX centerTurn to channel 1 inmanual modeSyntheticaltest ANT PTT(up)MONI(down) Adjust it to center frequency Error<150Hz1.CH:TX centerTurn to channel 2 inmanual modePTT(up)MONI(down)Adjust it to: 3.7<Po<4.7WI<1.6A2.CH: TX LOWTurn to channel 3Press PTTAdjust it to:3.7<Po<4.7 WI<1.6A9.Power3.CH:TX HIGHTurn to channel 4Press PTTSyntheticaltestAmmeter ANTAdjust it to:3.7<Po<4.7WI<1.6A1.CH: TX center,turn to channel 13in manual mode,dev: widePress PTTVR501 Adjust it to:4.2kHz±100Hz Wide10.MAXDEV 2.CH: TX center,turn to channel 13in manual mode,dev: narrowPress PTTSyntheticaltest LPF:15kHzAF:1kHz120mVANTMICCheck:1.8kHz-2.2kHz Narrow1.CH: TX center,turn to channel 13in manual mode,dev: widePress PTTVR501 Check:2.2kHz-3.6kHz Wide11.MICSENS 2.CH: TX center,turn to channel 13in manual mode,dev: narrowPress PTTSyntheticaltestFILER:0.3-3.4kHzAF:1kHz12mVANTMICCheck:1.1kHz-1.8kHz Narrow1.CH: TX center,turn to channel 9 inmanual mode67.0HzCTCSS12.DQT/QT 2.CH: TX center,turn to channel 16in manual mode,press PTTSyntheticaltest LPF:300Hz ANT VR500Adjust VR500,the test value ofon condition 1 & condition 2 isconsistent, the differencevalue<20Hz 250.3HzCTCSS13.QT DEV 1.CH: TX center,turn to channel 9 inmanual modeSyntheticaltestLPF:300Hz ANT PTT"up"MONI"down"Adjust it to:0.75kHz±50Hz Wide
19RPU416A Adjust Description2.CH: TX center,turn to channel 10in manual mode Adjust it to:0.35kHz±50Hz Narrow1.CH: TX center,turn to channel 11in manual mode Adjust it to:0.75kHz±50Hz Wide14.DQT DEV2.CH:TX center,turn to channel 12in manual modeSyntheticaltestLPF:300H ANT PTT"up"MONI"down"Adjust it to:0.35kHz±50Hz Narrow15.LowBattery levelTurn to channel 3in manual mode,Adjust the batteryto 5.8VDigitalvoltmeter "PTT"up"MONI"down"Adjust so that the LED flashes "Note:In manual mode , channel selector 1-12, MIC can’t connect line, after adjust complete, short SELF, entermode settingpress PTT, disable manual adjust.
20Disassembly for RepairSeparating the case assembly from the chassis1. Remove the two knobs # and three round nuts $.2. Remove the two screws %.3. Expand the right and left sides of the bottom of the case assembly"lift the chassis, and remove it from the caseassembly.4. Taking care not to cut the speaker lead, open the chassis and case assembly.Removing the leverRaise the lever on the lower case, insert a small flat screwdriver into the space between the case and lever , open thecase carefully and lift the lever off .Note: Do not force to separate the case from the lever.
21Exploded ViewPacking
22
RPU416A Level DiagramRx SectionSG output level for obtaining 12Db/SINAD when injected to each point Modulate the AF level with a frequency of 1kHz and deviation of 1.5kHzthrough a 470pF coupling capacitor. (Narrow), 3kHz(Wide) . Then take the signal form the signal generatorMeasure the 1st Local level on a RF VTVM. when the AF output has been adjusted to 0.63Vrms with the AF vol.Tx SectionMeasure the audio frequency on an AFVTVM and radio frequency on a RF VTVM at high impedance . Set the MIC input to obtain a modulation factor of 60%with the transmit frequency at center and a modulation frequency of 1kHz .ANT L112C145R2245RL20 3, L21 41st Local0.1VrmsIC200C212Q201R210SPQ307IC302VRIC300-116.5dBm -113dBm -98dBm -103dBm -104dBm -106.5dBm -103dBm 1018mVrms 175mVrms 23.5mVrms 0.63VrmsL20 8RF cente r IF 38.85MHz AF 1kHzQ202R211R217XF200Q203VR501IC500MIC Q4Q6Q100 Q101 Q102AF VTVM RF VTVM Q107Q105C114C108C106C100C40D5ANT4W16mVrms 430mVrms 310mVrms 0.15Vrms 0.44Vrms 0.8Vrms 0.62Vrms
24Main Technical SpecificationsFrequency range 450 MHz ~470 MHzChannel 16Channel space 25kHz / 12.5kHzAntenna impedance 50Transmitterimpedance 2K&Input voltage 7.2V DCFrequency stability ±2.5×10-6TransmitterFrequency stability ±2.5×10-6Output power 4.0±0.5WOperating sensitivity 12±3mVAudio distortion 5%Modulation limiting 5kHz / 2.5kHzBandwidth 16 kHz/8kHzModulate specialty  '3dBSpurious RF 7.5(WAdjacent power -65 d B / -55dBReceiverReference sensitivity Precede 0.28(V / 0.35(VSquelch turnonsensitivity 0.4(VAudio frequency 500mWAudio deviation 7%Operating bandwidth "±7 kHz"/"±3.5 kHz"Audio response +2dB -8dBChannel restrain -8 d BObstruct 85d BSelectivity 65 d B / 60dBSpurious response 60 d BIntermodulation 60 d B

Navigation menu