Motorola GTR 8000 - GTR 8000 Base Radio Optimization; 5.1 Aligning the Internal Frequency Reference Oscillator

5GTR8000BaseRadioOptimization
YourMotorolaFieldRepresentativeorMotorolaSystemSupportCenter(SSC)canadviseyouonoptimization
activitiesrequiredforyoursystem,ifany.See8.5UsingMotorolaSystemSupportCenter(SSC),page8-8.
ThischaptercontainsoptimizationproceduresandrecommendedsettingsrelatingtoGTR8000BaseRadio.
5.1AligningtheInternalFrequencyReference
Oscillator
Thetransceiveroptioncardwithinabaseradioorreceiverprovidesaninternal10MHzfrequencyreferencewhich
canbeusedastheprimaryorbackupfrequencyreferencesourceforthedevice.Forconventionalbaseradio/receiver
operation,italsoprovidestheanaloginterfacesandwildcardI/Os.
Afterabaseradioorreceiverisinstalledorafterthetransceiveroptioncardisreplaced,theinternalfrequency
referenceoscillatormustbealigned.
Thetransceiveroptioncardinternalfrequencyreferenceoscillatormustbealignedtowithin1ppb(partsperbillion).
Themeasuringequipmentusedtomakethisalignmentshouldbeaccuratetowithin1ppb.Thisaccuracytypically
requirestestequipmentwithadoubleovenoraRubidiumreferenceoscillator.
Thebaseradioorreceivermustbeturnedonforatleastoneweekbeforetheinternalfrequencyreference
oscillatorisaligned.
TheinternalfrequencyreferenceoscillatorforanOCXOtransceiveroptioncardmustbealigned:
•Uponinstallationofthebaseradioorreceiverforallbands.
•Onceeverytwoyearsafterinstallationfor700/800MHzsystems.
•OnceeveryveyearsafterinstallationforUHFsystems.
•VHFsystemsdonotrequirealignmentafterinitialinstallation.
TheinternalfrequencyreferenceoscillatorforaTCXOtransceiveroptioncardmustbealigned:
•UponinstallationofthebaseradioorreceiverforUHF.
•EveryyearafterinstallationforUHF.
Theinternalfrequencyreferenceoscillatorcanbealignedusingtwomethods:manualalignmentorautoalignment.
TheinternalfrequencyreferenceoscillatorcanonlybealignedonaGPW8000Receiverusingtheauto
alignmentprocedure.
SeeBaseRadioServiceHelp>ServiceScreens>AlignmentScreensintheCSSOnlineHelpforthealignment
procedures.
6871022P86-A-November20125-1