Motorola GTR 8000 - Checking Receiver Sensitivity (Self-Test Method) (IV and D)

5.10.5CheckingReceiverSensitivity(Self-testMethod)(IVandD)
9ClickStartSINADMeasurement.
Stepresult:TheSINADMeasurementV alueboxdisplayswait,andafter10secondsstartstodisplaythe
SINADresultsindB.
Withtheinitialsettingoftheservicemonitorsetforacarrierlevelof–80dBm,expectaSINADof
>26dB.Remembertocompensateforthelossofthecableconnectingtheservicemonitortothebase
radio.Ifthereceiverisinhibited,SINADwilldisplayameaninglessvalue.
10ChangetheservicemonitorsRFlevelandreadtheSINADagainuntilthevalueis12dB.
WhentheSINADvalueiscloseto12dB,wait10secondsafterchangingtheRFsignalgeneratorlevel.
Thebaseradioneeds10secondstostabilizetheSINADmeasurement.Remembertocompensateforthe
lossofthecableconnectingtheservicemonitortothebaseradio.
11RecordthesignalgeneratorRFlevel.Comparethisvaluetothesensitivityspecications.See1.9GTR8000
BaseRadio/GPW8000ReceiverSpecications,page1-12fortheappropriatevalue.
a.Keythetransmitterinthebaseradioandreadjustthegeneratoroutputleveluntil12dBSINADisindicated
ontheservicemonitor.Recordthislevel.
Stepresult:Lessthan1dBofdegradationshouldoccurduetothetransmittersbeingkeyed.
b.Dekeythetransmitter.
12ClickStopSINADmeasurementtostopthemeasurement.
13UnchecktheSINADmeasurementbox.
14Ifnofurthertestingisneeded,clickChangetoNormalModetoreturnthebaseradiotonormaloperation.
15Removeandrestorethefollowingconnectionstothebaseradio:
a.RemovetheservicemonitorGENportconnectionfromthebaseradioAntennaPort.
b.RestoretheAntennaconnectiontotheReceiveAntennaPort.
5.10.5CheckingReceiverSensitivity(Self-testMethod)(IV
andD)
Whenandwheretouse:
Usethisproceduretocheckthereceiversensitivityforthestationwithoutanytestequipment.Thereceiver
usesafactorycalibratedlow-levelnoisesourceatthereceiverinputtocheckperformance.Thisprocedurecan
beperformedremotely.
ProcedureSteps
6871022P86-A-November20125-39