Specifications

Section-5 Maintenance
October 17, 2013
5‐26
Copyright©2013,HarrisBroadcast
WARNING:Disconnectprimarypower priortoservicing. 888‐2693‐004
5.6.2.2 AnalogFinalFwdCalProcedure
STEP 1 Calibratetheaveragingpowermeterpermanufacturer’sinstructions.
STEP 2 Connectthepowermetertotheforwardsampleonthepre‐filterdirectional
coupler.
STEP 3 Enterthecoupleroffsetvalue(dB)intopowermetertoallowdirectpower
readings.NOTE:Thepowermeterreadsaveragepower.Conversiontopeak
visualpowerisrequired.
STEP 4 Setthepowermetertoreadinwatts.
STEP 5 Connectthevideosourcetothevideoinputofthetransmitter.Setvideo
sourcetoblackpicturewithzerosetup.
STEP 6 IfdualLPUsareinusesettheTCUDriverControltoManual.SelecttheLPU
tobecalibratedastheactiveLPU.
STEP 7 PressandholdtheLowerbuttonfor30secondstoreducetransmitterRF
outputatturn‐on.UsetheTCULowerbuttonfordualsystems.UsetheLPU
LowerbuttonifasingleLPUispresent.
STEP 8 TurntransmitteronbypressingtheOnbutton.UsetheTCUOnbuttonfor
dualsystems.UsetheLPUOnbuttonifasingleLPUisinuse.
STEP 9 SetbothNon‐LinearandLinearRTACtoBypass.ThisisdoneviatheLPUfront
panelLCDorviatheLPUGUIscreenshowninFigure5‐14onpage5‐23.
STEP 10 Switchoffthesoundcarrier.ThisisdoneonAnalogSetupscreen3shownin
Figure5‐16onpage5‐24.
STEP 11 Slowlyraisetransmitterpoweroutputtoratedforwardpowerbypressing
theRaisebuttonwhilemonitoringthepowerlevelonthepowermeter.Do
notholdtheRaisebuttoninforextendedperiods.Useindividualbutton
pressestoraisepowerwhilemonitoringpoweroutputonexternalpower
meter.
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 12
Setsynclevelto100%whileatratedoutput power.Thisisdonebyincreasing
ordecreasingtheSyncLevelOffsetonAnalogSetupscreen1shownin
Figure5‐15onpage5‐24.Thepow
eroutputwillneedtoberesetto100%
afterthesy
nclevelisadjusted.Thismaytakemultiplestepstogetproper
synclevelatfullpowerlevel.
STEP 13 StartcalibrationbynavigatingtotheSystemCalibrationscreenonleftin
Figure5‐13onpage5‐23.
STEP 14 SelectForwardcalibration.
STEP 15 SelectStartCal.
Caution
DO NOT DEPRESS THE POWER RAISE BUTTON FOR EXTENDED PERIODS
OF TIME WHILE RAISING POWER TO THE SPECIFIED CALIBRATION LEVEL.
HOLDING THE RAISE BUTTON IN CAN RESULT IN LARGE POWER
OVERSHOOTS THAT COULD DAMAGE THE PA MODULES. ADJUST POWER
SLOWLY BY MAKING DISCRETE BUTTON PRESSES WHILE CLOSELY
MONITORING THE EXTERNAL POWER METER FOR CHANGE. USE THE
DOUBLE UP ARROW GUI ICON TO RAISE POWER IN LARGER STEPS. USE
THE SINGLE ARROW ICON FOR SMALLER STEPS.