Kenwood NXR-710 Service Manual

Also see for NEXEDGE NXR-710: Instruction manual Instruction manual Instruction manual Instruction manual Instruction manual

NXR-71052ADJUSTMENTItem ConditionMeasurement AdjustmentSpecifications / RemarksTest-equipment Unit Terminal Unit Parts Method27. RepeatGain adjust[AnalogWide]FPU Test mode1) Adjust Item: [Repeat Gain(Analog Wide)]Connect the Deviation Meterto the TX ANT end via the ATT.Deviation Meter settingLPF: 15kHzHPF: OFFDe-emphasis: OFF2) Connect the SSG to the RXANT.SSG settingFrequency: Desired FrequencyOutput: –53dBm (501μV)MOD: 1.0kHzDEV: ±1.0kHzDeviationmeterOscilloscopeSSGRear TX ANTRX ANTPCADJ1.0kHz Deviation ±0.1kHzPress [Apply] button to storethe adjustment value.28. RepeatGain adjust[Analog Nar-row]FPU Test mode1) Adjust Item: [Repeat Gain(Analog Narrow)]Connect the Deviation Meterto the TX ANT end via the ATT.Deviation Meter settingLPF: 15kHzHPF: OFFDe-emphasis: OFF2) Connect the SSG to the RXANT.SSG settingFrequency: Desired FrequencyOutput: –53dBm (501μV)MOD: 1.0kHzDEV: ±1.0kHzConfirmation and Alignment of Set-up toPrevent Receiver Desensitization1. Confirmation of Duplexer alignmentThe duplexer allows the Repeater to simultaneously transmitand receive. To accomplish this, in the programmed receive fre-quency, the transmit frequency must be notched or suppressedby 75dB or more. Additionally, on the programmed transmit fre-quency, the receive frequency must be notched or suppressedby 75dB or more. The following figures are examples of Du-plexer alignment using a spectrum analyzer.Ref –10dBm# PeakLog10dB/Atten 5dBV1 V2V3 FCAA#Res BW 30kHz VBW 30kHzSpan 20MHzSweep 50ms (401 pts)RXTX75dB or more2. Confi rmation of Repeater DesensitizationThe following figure is a Test set-up for Repeater Desensiti-zation.After this Test set-up is completed, confirm the RepeaterDesensitization as mentioned below.1) Disable the repeater mode.2) Adjust the level of the RF generator until 12dB SINAD isreached.3) Increase the output of the RF generator by 1dB. (This in-creases the SINAD.)4) Enable the repeater mode.5) Read the SINAD level. It should not drop below 12dBSINAD. If the SINAD is less then 12dB, check the tightnessof the connectors and the tuning of duplexer.50ΩdummyRF signalgeneratorDuplexerRepeaterAttenuatedport