Motorola GTR 8000 - Required Test Equipment; Tuning a 700;800 Mhz Duplexer; Tuning a VHF Duplexer

5.9.2RequiredTestEquipment
TuningisperformedbyinjectingRFsignalsandmakingtuningadjustments(usingthetuningrodsandtrimmer
screws)whilemonitoringformaximumorminimumreadingsontheRFmillivoltmeter.Fieldtuningtheduplexer
modulerequiresthefollowinggeneraladjustments:
•Tunehigh-pass/low-notchcavitiesformaximumpassandrejectresponse
•Tunelow-pass/high-notchcavitiesformaximumpassandrejectresponse
•Checkhigh-pass/low-notchandlow-pass/high-notchcavitiesforinsertionloss
•Checkhigh-pass/low-notchandlow-pass/high-notchcavitiesforisolation
5.9.2RequiredTestEquipment
Tuningoftheduplexermodulerequiresthefollowingtestequipment:
•RFSignalGenerator-Aeroex3900SeriesServiceMonitor
•RFMillivoltmeter(Boonton92Eorequivalent)
•50OhmN-typeterminator
•Tuningtool(5/32"x4"screwdriver)(UHF)
•Male-to-FemalesN-Type"T"connector(UG-107B/Uorequivalent)(VHF)
•Slottedscrewdriver(VHF)
•3/32"Allenwrench(VHF)
•Tuningtool(thinblade)(VHF)
•N-to-Nbulletconnector(UG29A/Uorequivalent)
•7/16"Nutdriver(UHF)
•7/16"OpenEndWrench(UHF)
•N-to-BNCAdapter(UG349A/U)
•N-to-NConnector(UG57B/U)
5.9.3Tuninga700/800MHzDuplexer
Noeldtuningisneededona700or800MHzduplexer.Theduplexersarepre-tunedtooperateovertheentire
sub-band.
5.9.4TuningaVHFDuplexer
Thefollowingproceduresaremosteasilyperformedwiththeduplexermoduleremovedfromtherackorcabinet.
Knowthetransmitandreceivefrequenciesfortheparticularbaseradiobeforebeginning.
Iftheduplexermoduleistunedaccordingtoinstructionsanddoesnotmeetspecicationsforreturnloss,insertion
loss,and/orisolation,theduplexermustbereturnedforrepair.
6871022P86-A-November20125-13