Mirrex_PPR125_ENG维修说明书手册含电气原理图.pdf
PPR-125ALIGNMENT(EPT012510B)
1.0TESTEQUIPMENT
1.Oscilloscope(50MHz)6.FrequencyCounter(100MHz)
2.DCPowerSupply(13.8V,10A)7.MultiMate(digital)
3.DeviationMeter8.DistortionMeter
4.AudioSignalGenerator9.SpectrumAnalyzer
1.1PLLSYNTHESIZER/OSCILLATORFREQUENCYALIGNMENT
ITEMCONNECTSSETTINGADJUSTMEASUREMENT
VCOSetradiotoCH1AMRXmode.L90.11VDC
VOLTAGEconnectvoltmetertoR75
ConnectOscilloscopetoJP45L15
SetradiotoCH19AMRXmode.VC110.24000MHz
ConnectFrequencycounter
AMFREQSetRadiotoCH19AMRXmode16.49000MHz±20Hz
ConnectFrequencycountertoL8
1.2TRANSMITTERALIGNMENT
1
ITEMCONNECTSSETTINGADJUSTMEASUREMENT
TXSetRadioCH19AMTXmode
Conn
POWERJack
SetradiotoCH40.AMTXmode
SetradiotoCH1.AMTXmode
AMSetradiotoCH19.AMTXmodeL173.8W
TXPOWERNOMOD0.3W±0.2W
AMSetradiotoCH19.AMTXmodeVR490%
MODULATIONAudiosignal30mV,1KHztoMICMeter90%
S/RFMETERMeterswitchtoS/RFposition..thetop
1.3RECEIVERALIGNMENT
2
ITEMCONNECTSSETTINGADJUSTMEASUREMENT
SENSITIVITYRFgainfullyclockwise,SQatL1,2,3,4,5S/N10dB
’
MIN,VOLcontrolat20clock.
ConnectRFSGtoANTjack
Frequency27.185MHzMOD30%
0.5uV.c