Specifications

Section-5 Maintenance
October 17, 2013
5‐18
Copyright©2013,HarrisBroadcast
WARNING:Disconnectprimarypower priortoservicing. 888‐2693‐004
onthecableswillaffectRTACperformance.ThesignallevelintoeachRTAC
pre‐filtersampleportshouldbeanominal‐5dBm(t otalaveragepower,
measuredwithpowermeter,allchannelsoperating)foroptimal
performance.
STEP 3 Turnononetransmitterandadjusttolicensedoutputpower.*
STEP 4 SettheactiveexciterDUC/RTAC(screen3)DownConverterBandpassFilter
toOn.
STEP 5 TheappropriateRTACLinearProfilemustbeselected(basedonbest
measuredcorrection).TheprofileselectionismadeontheexciterDUC/RTAC
RTACProfiles(screen4)andisbasedonbestperformanceanddetermined
bytrialanderror.TheProfileatthetopofthelist(Basic)shouldbetried
first.
a.
UseDUC/RTACsetup(screen1)tosetRTACnon‐linearcorrectiontoAdapt.SetRTAClinear
correctiontoAdapt.Allowadaptiontocompleteatleasteightattemptsandcorrections.
RecordtheshoulderlevelsachievedandtheMERorEVMvalue.
b.SelectthenextProfileonthemenu(Short)andrepeattheadaptionprocess.Recordthe
shoulderlevelsachievedandtheMERorEVMvalue.
c.Repeatsteps5,a.,&b.withdifferentProfilesettingswhilemonitoringtheshoulderlevels
andMER/EVMlevels.
d.GobacktotheProfilesettingthatgavethebestperformance.
e.UseDUC/RTACsetupscreen1tosetRTACnon‐linearcorrectiontoAdapt.SetRTAClinear
correctiontoAdapt.Allowadaptiontocompleteatleasteightattemptsandcorrections.
Setlinearandnon‐linearRTACtoHold.
STEP 6
Savelinearandnon‐linearRTACsettingsandnametheStoredsettingsfilefor
lateridentification.
STEP 7 TurnOfftransmitter.
STEP 8 Repeatsteps3thru7forallothertransmittersoneatatime.Onlyone
transmittershouldbeonduringthesetuningsteps.
STEP 9 Turnoneachtransmitter&bringuptofullpower,setRTACnon‐linearto
AdaptandlineartoStored(usethelinearsettingssavedinstep5).
STEP 10 Repeatstep9forthealltransmitters.
STEP 11 Endofprocedure.
*Somesystemsusecombinersthataretemperaturecompensated.Thesesystemswillrequiretheindividual
transmitteradaptionstepstobeperformedwhilethecombinerisatoperatingtemperature.Inthesecases,allthe
transmittersmustbebroughtuptopowerandoperatedforseveralminutesinbetweenindividualchannelsetupsto
keepthec
ombinertuned.SeveralhoursmayberequiredtoperformtheRTACsetupfortemperaturesensitive
combinersystems.
Theste
psaboveneedtobeperformedforeachexciterintransmitterswithdualdrives.
Asnot
edabove,RTACperformancewilldifferforeachRFcombinersystemdependingonchannels,powerleveland
configuration.InsomeinstanceslinearcorrectioncanbeachievedwithRTACoperatinginAdaptmode,whilein
others,operationinStoredmodeasdescribedabovemayberequired.
Thef
ollowingkitscanbepurchasedtosplittheRTACsamplesforuseinmulti‐channelsystems:
• Kit,RTAC2XMTRupto5kW9710005190(1‐5/8 " )
• Kit,RTAC3XMTRupto5kW9710005191(1‐5/8 " )
• Kit,RTAC4XMTRupto5kW9710005192(1‐5/8 " )
• Kit,RTAC5XMTRupto5kW9710005193(1‐5/8 " )
• Kit,RTAC6XMTRupto5kW9710005194(1‐5/8 " )