Sharp SD-AT1000W Specifications Page 208

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Section-5 Maintenance
October 17, 2013
528
Copyright©2013,HarrisBroadcast
WARNING:Disconnectprimarypower priortoservicing. 8882693004
5.6.3.1 AnalogSystemReflectedCalProcedure
Priortosystemreflectedpowercalibration,forwardpowercalibrationmustbeperformedorconfirmed.
STEP 1
ZeroandcalibratetheRMSpowermeter,followingthemanufacturers
proceduresforspecificmodelbeingused.
Note
The power meter reads average power. Conversion to peak visual power is required. See Section 5.6.1 on
page 5-21 for methodology.
STEP 2
Locatethesystemforwardcalibrationsample,whichshouldhavebeen
measuredandlabeledatthefactorywiththecouplingfactorforyour
frequencyofoperation.Thiswilleitherbeaforwardportontheprefilter
directionalcouplerwhichisleftavailableforthispurposeinastandalone
(i.e.nonra
cked)configuration,orthefrontbulkheadPREFILTERforward
powersampleinarackedconfiguration.Ifthecouplingfactorisinquestion,
orifthefrequencyhaschanged,theapplicableforwardcouplerportshould
besweptwithanetworkanalyzertodeterminethenewcouplingvalue.
Pleaseremembertoincludethesampl
ecableswhencharacterizingthe
bulkheadmeasurementpoint.
STEP 3 Oncethecouplingvalueisdetermined,enterthisvalueasanoffsetinyour
powermeter,setthemetersdisplaytoreadindBm(3digitsissufficient,i.e.
xx.xdBm),andconnectthemeterssensortothisport.
Note
Be certain that the sample level present at this point (max system output, in dBm, minus the coupling fac-
tor) does not exceed the maximum input range of your particular
power sensor.
STEP 4
Connectthevideosourcetothevideoinputofthetransmitter.Setvideo
sourcetoblackpicturewithzerosetup.
STEP 5 IfdualLPUsareinusesettheTCUDriverControltoManual.SelecttheLPU
tobecalibratedastheactiveLPU.
STEP 6 PressandholdtheLowerbuttonfor30secondstoreducetransmitterRF
outputatturnon.UsetheTCULowerbuttonfordualsystems.UsetheLPU
LowerbuttonifasingleLPUispresent.
STEP 7 TurntransmitteronbypressingtheOnbutton.UsetheTCUOnbuttonfor
dualsystems.UsetheLPUOnbuttonifasingleLPUisinuse.
STEP 8 SetbothlinearandnonlinearRTACtoBypass.ThisisdoneviatheLPUfront
panelLCDorviatheLPUGUIscreenshowninFigure514onpage523.
STEP 9 Switchoffthesoundcarrier.ThisisdoneonAnalogSetupscreen3shownin
Figure515onpage524.
STEP 10 RaisetransmitterpoweroutputtoratedforwardpowerbypressingtheRaise
buttonwhilemonitoringthepowerlevelonthepowermeter.
STEP 11 Setsynclevelto100%whileatratedoutputpower.Thisisdonebyincreasing
ordecreasingtheSyncLevelOffsetonAnalogSetupscreen1shownin
Figure515onpage524.Thepow
eroutputwillneedtoberesetto100%
afterthesy
nclevelisadjusted.Thismaytakemultiplestepstogetproper
synclevelatfullpowerlevel.
STEP 12 Enterthereflectedpowercalibrationmenu,eitherfromthefrontpanel
(Setup>XMTRPOWERSETTINGS>POWERCAL>REFLECTED)orfromthe
WebGUI.See’SystemCali bration’(leftside)Figure513onpa
ge523
STEP 13 Lowpointcali bration:RemovetheFWDandRFLDsamplecablesfromthe
activeLPU(thecablesarelabeledFWDandRFLDontheirrespectiveheat
shrink,forreferencewhenreconnectingthem.)Ifdesired,youmayusea
powermetertomeasurethelevelpresentontheFWDsamplecableand
verifytha
titisapproximately0dBm.ConnecttheFWDsamplecable,
througha20dBattenuatorpad,totheREFPwrinput.PressSavetostorethe
valueandproceedtothehighpointcalibration.RefertoFigure517onpage
529.
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