Kenwood NXR-800 Service Manual

Also see for NEXEDGE NXR-800: Brochure Instruction manual Instruction manual Instruction manual Instruction manual

Contents

NXR-80075ADJUSTMENTItem ConditionMeasurement AdjustmentSpecifications / RemarksTest-equipment Unit Terminal Unit Parts Method11. ReceiveVCO LockVoltage(Check)1) A: Low DVMPCRX CV1 Check 0.8~1.2V2) A: High 3.5~4.2V3) B: Low 0.8~1.2V4) B: High 3.0~3.7V12. ReferenceSignalThe switch-ing circuit toswitch theOCXO and theinternal refer-ence oscilla-tion1) Connecting 50Ω load to SSGparallel.SSG frequency: 10MHzSSG output: +0dBm (224mV)SSGSpectrumanalyzerRearTXREF INREF OUTTX VR402 +8~+9dBm The OCXO LED (orange)lights.2) SSG frequency: 10MHzSSG output: +0dBm (224mV)SSGOscilloscopeRearTXREF INREV_LVVR401 2.0Vp-p3) SSG frequency: 10MHzSSG output: +10dBm (708mV)SSGSpectrumanalyzerRearTXREF INREF OUTCheck REF OUT: +10dBm or lessThe OCXO LED (orange)lights.4) SSG frequency: 10MHzSSG output: –10dBm (70.7mV)REF OUT: –50dBm or lessThe OCXO LED goes off.13. VCXO 1) Confirm that there is noOCXO and external referenceinput.F. counterPCTX REF_IN PCADJ5.99MHz+0.3ppm ±0.15ppm(5.99000270~5.99000090MHz)14. BPF 1) Tracking generatorOutput: –20dBmSpectrum analyzerFrequency: Desired frequencySpan: 50MHzTrackinggeneratorSpectrumanalyzerRearRXRX ANTCN41RX L132L133L134L135Center frequencyyou are using, thenadjust it to look likethe wave in figure 1.Refer to Fig. 1. (Page 72)15. MCF 1) WideTracking generatorOutput: –20dBmSpectrum analyzerFrequency: 49.95MHzSpan: 100kHzTrackinggeneratorSpectrumanalyzerRearRXCN46CN47RX L46L52L74L90Adjust it to look likethe wave in figure 2.Refer to Fig. 2. (Page 72)2) NarrowSpectrum analyzerSpan: 50kHzL47L53L75L91Adjust it to look likethe wave in figure 3.Refer to Fig. 3. (Page 72)16. Discriminator 1) NarrowFrequency: Desired frequencySSG output: –53dBm (501μV)SSG MOD: 1kHzSSG DEV: 1.5kHzAF output: 2V/4ΩSSGAF V.MRear RX ANTTEST/SPKRjack SPO(pin 12)4Ω loadRX L128 Adjust AF outputmax.17. DriverAmplifi erPowerDisconnect the cable from TXOUT and insert a cable frompower meter.After the adjustment, connectthe cable to TX OUT.1) Low2) Center3) HighPower meter TX TX OUT(CN802)PCADJ+20.0dBm ±0.1dBm