Motorola GTR 8000 - 2.3 RFDS Modules

GTR8000BaseRadio
2.2BackplanesandCardCages
CardcagesfortheGTR8000BaseRadioarecreatedwithaweldedandriveteddesign.Eachcardcagehasa
backplane.
•See3.4.5Connections–Rear(IntegratedV oiceandData),page3-23and3.4.6Connections–Rear(HPD),
page3-26.
2.3RFDSModules
TheRadioFrequencyDistributionSystem(RFDS)equipmentincludedinyoursystemdependsonwhatoptionswere
purchasedfromMotorola.ThefollowinglistssomeexamplesoftheRFDSequipmentavailableforyoursystem.
2.3.1RFDS-Preselector(700/800MHz)
Figure2-12PreselectorFilter(700/800MHz)
ThepreselectorprovidesarstlevelofbandpasslteringforinboundRFsignals.RFinputandoutputconnectors
arecabledtotheGTR8000BaseRadiosRFOutputRxA.ThisltermustbeincludedtofulllTIA102-CAAB
ClassAspuriousresponserejection(90dB).Thelterisusuallynotrequiredwhenusingareceivermulticoupler
system.ThisltercanNOTberetunedintheeld.
2.3.2RFDS-Preselector(UHF)
Thepreselectorrejectsunwantedsignalsincludingthetransmittersignalsfromoverloadingthereceiver.Thislter
mustbeincludedtofulllTIA102-CAABClassAspuriousresponserejection(90dB).Thelterisusuallynot
requiredwhenusingareceivermulticouplersystem.Thisltercanberetunedintheeld.
2-12
6871022P86-A-November2012