HP70L / HP70HServiceManual
Contents
1TECHNICALSPECIFICATIONS....................................................................................................................3
1.1Testmethods.........................................................................................................................................................................3
1.2Specificationstable..............................................................................................................................................................3
2CIRCUITDESCRIPTION...............................................................................................................................4
2.1General information...............................................................................................................................................................4
2.2Microprocessor/control .........................................................................................................................................................4
2.3VCO/Synthesizer(PLL).....................................................................................................................................................4
2.3.aTemperature-CompensatedCrystalOscillator(TCXO).........................................................................................4
2.3.bVoltage-ControlledOscillators(VCO).....................................................................................................................4
2.3.cSynthesizer..............................................................................................................................................................5
2.3.dLoopFilter...............................................................................................................................................................5
2.4Transmitter...........................................................................................................................................................................5
2.4.aRF PowerAmplifier.................................................................................................................................................5
2.4.bAntennaSwitching..................................................................................................................................................5
2.4.cPowercontrol...........................................................................................................................................................5
2.4.dTransmitterAudioCircuits.......................................................................................................................................6
2.4.eAudio Processing....................................................................................................................................................6
2.5Receiver...............................................................................................................................................................................6
2.5.aReceiverFront End.................................................................................................................................................6
2.5.bLocalOscillator(LO)...............................................................................................................................................6
2.5.cMixer........................................................................................................................................................................6
2.5.dFMDetectorandSquelch.......................................................................................................................................6
2.5.eReceiverAudioCircuit.............................................................................................................................................6
2.6Signalling...............................................................................................................................................................................7
2.6.aGeneral....................................................................................................................................................................7
2.6.bCTCSSToneEncoder/DigitalCodeSquelch(DCS) Encoder.............................................................................7
2.6.cSelectivecall ............................................................................................................................................................7
2.6.dScrambler................................................................................................................................................................7
2.7Battery..................................................................................................................................................................................7
3ADJUSTMENTSHP70L.................................................................................................................................8
3.1General .................................................................................................................................................................................8
3.2NeededEquipment:..............................................................................................................................................................8
3.3Programmingtheradio.........................................................................................................................................................9
3.4Synthesizer/TransmitterVCOCheck..................................................................................................................................9
3.5FrequencyAdjustment.........................................................................................................................................................9
3.6TransmitterAlignment..........................................................................................................................................................9
3.6.aPowerAdjustment...................................................................................................................................................9
3.6.bModulationAdjustment.........................................................................................................................................10
3.6.cCTCSS/DCSadjustment........................................................................................................................................10
3.6.dSelcalmodulationadjustments..............................................................................................................................10
3.7ReceiverAlignment............................................................................................................................................................10
4ADJUSTMENTSHP70H..............................................................................................................................12
4.1General ...............................................................................................................................................................................12
4.2NeededEquipment:............................................................................................................................................................12
4.3Programmingtheradio.......................................................................................................................................................13
4.4Synthesizer/TransmitterVCOCheck................................................................................................................................13
4.5FrequencyAdjustment.......................................................................................................................................................13
4.6TransmitterAlignment........................................................................................................................................................13
4.6.aPowerAdjustment.................................................................................................................................................13
4.6.bModulationAdjustment.........................................................................................................................................14
4.6.cCTCSS/DCSadjustment........................................................................................................................................14
4.6.dSelcalmodulationadjustments..............................................................................................................................14
4.7ReceiverAlignment............................................................................................................................................................14
4.8Figure1-Test adaptor......................................................................................................................................................15
