Kenwood NX-800H Service Manual

Also see for NEXEDGE NX-800H: Function reference Instruction manual Instruction manual Specifications Service manual

Contents

NX-800H23■ 5 reference level adjustments frequencyTuning point RX (MHz) TX (MHz)Low 335.05000 335.10000Low’ 347.55000 347.60000Center 365.05000 365.10000High’ 382.55000 382.60000High 399.95000 399.90000■ Adjustment item supplementAdjustment Item DescriptionLCD contrast The contrast of LCD display can be changed.Receive Assist The lock voltage of VCO (Receive) is adjusted.This item must be adjusted before all adjustment items for receiver section are adjusted.Transmit Assist The lock voltage of VCO (Transmit) is adjusted.This item must be adjusted before all adjustment items for transmitter section are adjusted.RTCRea Time Clock (RTC) is adjusted.This item uses the internal clock.(Any measurement equipment is not required.)FrequencyFrequency stability is adjusted under receiving condition with SSG.The SSG needs 0.001ppm accuracy so please use a standard oscillator if necessary.This item can be adjusted only in PC Test Mode so that the adjustment value is not changed easily.High Transmit Power Limit The limit value of the High Transmit Power output is adjusted.Low Transmit Power Limit The limit value of the Low Transmit Power output is adjusted.High Transmit Power High Transmit Power is adjusted.Low Transmit Power Low Transmit Power is adjusted.BalanceThe transmit audio frequency response is adjusted.This item is adjusted so that the deviation of 2kHz becomes the same deviation of 20Hz.This item must be adjusted before all adjustment items for deviations are adjusted.Maximum Deviation(NXDN Narrow/Very Narrow) Maximum Deviation of NXDN (Narrow/Very Narrow) is adjusted.Maximum Deviation(Analog Wide/Narrow)Maximum Deviation of Analog (Wide/Narrow) is adjusted.This item must be adjusted before all adjustment items for tone deviations are adjusted.Note: “Maximum Deviation (Analog Narrow)” must be adjusted before “CWID Deviation (NXDN VeryNarrow)” is adjusted.QT Deviation QT tone deviation is adjusted.DQT Deviation DQT tone deviation is adjusted.LTR Deviation LTR tone deviation is adjusted.DTMF Deviation DTMF tone deviation is adjusted.Single Tone Deviation The deviation of Single Tone used in “2-tone” is adjusted.MSK Deviation MSK tone deviation is adjusted.CWID DeviationCWID tone deviation is adjusted.CWID is used to inform the others who is transmitting on a 6.25-kHz spacing channel.(In FCC rule, Analog mode or CWID is required for each channel-spacing.)Sensitivity 1Sensitivity 1 allows a service engineer to improve the intermodulation rejection, receiver spurious response,and receiver sensitivity characteristics by changing the voltage of Variable-Capacitor Tune in the receiverfront-end circuit of the primary band-pass filter to optimize the characteristics at five frequency spots.Sensitivity 2Sensitivity 2 allows a service engineer to improve the intermodulation rejection, receiver spurious response,and receiver sensitivity characteristics by changing the voltage of Variable-Capacitor Tune in the receiverfront-end circuit of the secondary band-pass filter to optimize the characteristics at five frequency spots.RSSI Reference The minimum RSSI level for scan stop is adjusted.Open Squelch The squelch level at level “5” is adjusted.ADJUSTMENTNote:Although the frequency range of this transceiver is 380 to400MHz, the circuit and adjustments are designed underconsideration of other market types.When making adjustments, adjust at all frequency pointsfollowing the service manual.