Motorola GTR 8000 - Tuning the VHF Preselector; UHF Tuning Procedures; Calculating Proper UHF Alignment Frequency; Calculating the UHF Alignment Frequency for a Single Receive Frequency

GTR8000BaseRadio
5.8.1.3.1TuningTheVHFPreselector
ProcedureSteps
1Turnthebaseradio/receiverpowersupplyON(toprovidea50Ohmtermination).
2Adjustthesignalgeneratortothefrequencycalculatedin5.8.1.1.1CalculatingTheVHFAlignmentFrequency
ForaSingleReceiveFrequency,page5-5or5.8.1.1.2CalculatingTheVHFAlignmentFrequencyforMulti
ReceiveFrequencies,page5-5.Setthelevelto+5dBm.
3InserttuningprobeintocavityH1andadjusttuningscrew1foraPEAK.
4LeavetuningprobeincavityH1andadjusttuningscrew2foraDIP.
5InserttuningprobeintocavityH2andadjusttuningscrew3foraDIP.
6InserttuningprobeintocavityH3andadjusttuningscrew4foraDIP.
7InserttuningprobeintocavityH4.Decreaseoutputfromsignalgeneratorto–5dBm.
8Adjusttuningscrew5foraDIP.Thenturntuningscrew5anadditional1/4turncounterclockwise.(Notethat
DIPwillnotbeassharpforscrew5asitwasforscrews2through4.)
5.8.2UHFTuningProcedures
5.8.2.1CalculatingProperUHFAlignmentFrequency
Useeither5.8.2.1.1CalculatingTheUHFAlignmentFrequencyForaSingleReceiveFrequency,page5-8or
5.8.2.1.2CalculatingTheUHFAlignmentFrequencyForMultiReceiveFrequencies,page5-9tocalculatethe
alignmentfrequencytobegeneratedbythesignalgenerator.
5.8.2.1.1CalculatingTheUHFAlignmentFrequencyForaSingleReceive
Frequency
Whenandwheretouse:
Forbaseradioswithasinglereceivefrequency,calculatethefrequencyofthealignmentsignalasfollows:
5-86871022P86-A-November2012