Kenwood NXR-800 Service Manual Supplement

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

Contents

NXR-80053ADJUSTMENTItem ConditionMeasurement AdjustmentSpecifications / RemarksTest-equipment Unit Terminal Unit Parts Method10. 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 3.0~3.7V K3.3~4.0V K211. ReferenceSignalThe switch-ing circuit toswitch theOCXO and theinternal refer-ence oscilla-tion1) Connecting SSG to REF INand 50Ω-load parallel.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-p The OCXO LED (green) lights.3) SSG frequency: 10MHzSSG output: +10dBm (708mV)SSGSpectrumanalyzerRearTXREF INREF OUTCheck REF OUT: +10dBm or lessThe OCXO LED (orange)lights.4) SSG frequency: 10MHzSSG output: –7dBm (99.9mV)REF OUT: –50dBm or lessThe OCXO LED goes off.12. VCXO 1) Confi rm that there is noOCXO and external referenceinput.F. counterPCTX REF_IN PCADJ5.99MHz+0.3ppm ±0.15ppm(5.99000270~5.99000090MHz)It takes a time from move-ment of adjustment value tostability.13. MaximumDeviation(NXDN)1) NXDN Narrow PCADJValue: 22800 Fixed value writing2) NXDN Very Narrow Value: 1000014. 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 (100mW) ±0.1dBmDisconnect the cable from TXOUT and insert a cable frompower meter.After the adjustment, connectthe cable to TX OUT.15. HighTransmitPower(Pre ADJ)1) Low Power meterPCRear TX ANT PCADJValue: 1024 Fixed value writingFinal VR2 5.0W ±0.1W16. CouplerADJ1) Low DVM Final REF Final VR1 0.09~0.14V Adjust to the minimum value,if it is not reduced to 0.14V.17. HighTransmitPower(Max powerlimit ADJ)1) High Power meterPCRear TX ANT PCADJValue: 1024 Fixed value writingFinal VR2 7.0W ±0.2W2) Low PCADJValue: 1024 Fixed value writingCheck 6.5W or more