Specifications

Section-3 Operation
October 17, 2013
3‐28
Copyright©2013,HarrisBroadcast
WARNING:Disconnectprimarypower priortoservicing. 888‐2693‐004
DuringnormaloperationtheLPUwillautomaticallyusethecalibrationsetthatisclosesttothecurrentfrequency
setting.IfnostoredcalibrationdataforFactoryForwardorReflectedPowercalibrationexists,afaultwillbelogged,
causingtheexcitertomute.SystemCali
brationisdiscussedindepthinSection5.4,DigitalPowerCalibrations,on
page5‐8.Ref
ertothatsectionforthecompleteSystemPowerCalibrationprocedure.
3.6.6 LPUExciterHomeScreen
Figure 3-28 LPU Exciter Home Screen
Table3‐19XmtrHome>ExciterHome
Field Description
PerformanceW
indowandSystemOutput:Notavailableforanalogmodulation.Performanceparametersdisplayedwillvary
dependingonmodulation.TheonairperformancedatacomesfromthePostHPFsampleandisnotswitchable.Ifthesampleis
notpresentthegraphwillnotbedisplayed.
LSB
Indicatesthelow
ersidebandintermodulationproductlevel,indB,attheshoulder(first0.25MHzinto
theloweradjacentchannel).ATSCshoulderswillbe11.2dBhigherthanshownonthescreen.
USB
Indicatestheuppersidebandintermodulationproductlevel,indB,attheshoulder(first0.25MHzinto
theUpperadjacentchannel).ATSCshoulderswillbe11.2dBhigherthanshownonthescreen.
SNR Signaltonoiserat
ioindB
EVM Errorve
ctormagnitudein%
ExciterSt
atusWindow
TransmitterFr
eq.(Hz) ExactfrequencyoftransmitterinHertz
Main/Standby
Thisfieldi
ndicatestheon‐airstatusoftheLPU.Inadualdrivesystem,theactiveLPUwilldisplayMain
(greenfield).TheinactiveexciterwilldisplayStandby(inblue).
Mute/MUTE
Thisfieldindi
catesthemutestatusoftheexcitersection.IftheLPURFOutputismuted,thisfield
displaysMUTE(uppercase,redfield).Iftheoutputisnotmuted,thefielddisplaysMute(lowerca se,
greenfield).WhentheUAXtransmitterisswitchedOFF,theMUTEfieldwillbered.
OK/WARNING/FAULT
Thisfieldindi
catesasummarystatusoftheLPUexcitersection.Ifnowarningsorfaultsexistwithin
theexcitersection,theindicationdisplaysOK(greenfield).Whenanexciterparameterapproachesits
limit,thefieldsdisplaysWARNING(yellowfield).Ifafaultoccurswithintheexciter,thefielddisplays
FAULT(r
edfield).
RT ACW
indowTheRTAC(RealTimeAdaptiveCorrection)sectionoftheExciterHomeScreendisplaystheoperatingmodeofthe
correctors.TheRTACsectionoftheExciterHomescreenisasoftkey.Whenselectedbyleftmouseclick,thefirstscreenofRTAC
Setupispresented.RefertoRTACSetupandFigure3‐34onpa
ge3‐33.
Linear
Correctoruse
sRFfeedbacksampletakenafterthehighpowerfilter.Usedtocorrectforfilter
distortionsinamplitudeandgroupdelay.
Section3.6onpage3‐20
Section3.7onpage3‐30
Section3.8onpage3‐73
Section3.6.7onpage3‐29