QUANTUN QP-750 Service Manual
Also see for QP-750: User manual
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Contents
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QP-750 Service Manual- 12 -2.3.2 AdjustmentFirstly reset the radio. Refer to All Reset Mode in ”Modes” for more details:VCO adjustment(1) Adjustment in user mode(2)Setting Power supply voltage: 7.4VItem Condition Measurement Adjustment SpecificationTestInstrumentTerminal Parts Method1.2.TransmitVCO lockvoltage1. CH: TX high DigitalVoltmeterCV TC1350TC13514.2V±0.3V2. TX Low Check >0.7V3.ReceiveVCO lockvoltage1. CH: RX high 4.2V±0.3V2. RX low Check >0.7VTransmitter adjustment(1) Enter the manual adjust mode(2) Setting Power supply voltage: 7.4VItem Condition TestInstrumentMethod PurposeGroup 10. TransmitfrequencyTurn to CH1; RadioCommunication Test Set;TX TestAdjust VR21 Frequency Error≤100Hz1. TX powerLowTurn to CH1.Adjust at 5 point (wideband).RadioCommunication Test SetTX TESTHPF：20HZLPF：300HZPTT keySFK2 key 1.1W±0.2W2. CDCSSbalanceTurn to CH2.Adjust at 3 point (wideband),PTT keySFK2 keystandard waveform3. CDCSSdeviationTurn to CH3.Adjust at 3 point (wideband),1 point (medium band)1 point (narrowband)PTT keySFK2 key750Hz (25KHz),600Hz (20KHz)400Hz (12.5KHz)4. CTCSS(67.0Hz)deviation LowTurn to CH4.Adjust at 3 point (wideband),1 point (medium band)1 point (narrowband).PTT keySFK2 key5. CTCSS(136.5Hz)deviationCenterTurn to CH5.Adjust at 3 point (wideband),1 point (medium band)1 point (narrowband)PTT keySFK2 key6. CTCSS(254.1Hz)deviation HighTurn to CH6.Adjust at 3 point (wideband),1 point (medium band)1 point (narrowband).PTT keySFK2 key |
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