Specifications

Section-5 Maintenance
October 17, 2013
5‐12
Copyright©2013,HarrisBroadcast
WARNING:Disconnectprimarypower priortoservicing. 888‐2693‐004
Figure 5-7 FWD cable direct to REF PWR port
STEP 8
Thesystemwillnowpromptyoutoreconnectthecablesintheiroriginal
configuration(FWDtoFWD,RFLDtoREF)beforeproceeding.Ifyouforgetto
performthisstep,thesystemwillgointoVSWRfoldbackwhenyouattempt
toreturntonormaloperation.
STEP 9 Procedurecomplete.
5.4.4.1 CalibrationErrors
If,uponcompletionofthecalibrationsequence,them essage"CalibrationError"isdisplayed,repeattheprocedure
andnotethedisplayeddetectorADCvalue.Ifyouareabletoobtainthespecifiedforwardoutputpowerlevelas
indicatedonyourmeter,buttheADCisindicatingnear‐zerovalues,oriftheAD
Cvalueatthehighpointequals(oris
lessthan)thevalueatthelowpoint,thesystemwilldiscardthecalibration.Inthiscase,afterraisingthesystem
outputtothelevelindicated,checktheactualpowerpresentattheFWDsamplecable(rememberturnoffthe
powermeter ’soff
set.)Youshouldhaveapproximately0dBmatthispoint(thecableendthatconnectstotheLPU
input)atfullsystemforwardpower.Ifyoudonot,pleaseverifythecabling,workingstepbystepfromtheLPUend
backtowardsthecoupler.
Ifan
yPAsarefaultedduringthecalibration,thesystemwillconsideritinvalidanddiscardit.ReplaceanyfaultyPAs,
andperformthecalibrationagain.
5.4.5 CalibrateLPUUDCOutput
UDCreferstotheoutputoftheupdownconverterboard(modulatorsectionoftheLPU)ontherearoftheLPU.This
isanSMAconnectorlabeled"RFOU T".
STEP 1
OntheLCDscreen,selectSETUP>XMTRPOWERSETTINGS>POWER
CALIBRATION.Onthewebbrowser,selectUAXHome>Config>CAL.
STEP 2 HighlighttheUDCcalibrationmenuitem.SelectUDC.
STEP 3 ConnectthepowermetertoRFOUT (UDC)SMAconnectoronleftrearofthe
LPU.