Specifications

Section-5 Maintenance
November 11, 2013
5‐26
Copyright©2013,HarrisBroadcast
WARNING:Disconnectprimarypowerpriortoservicing. 888‐2628‐300
5.10.3 ExciterOutputCalibration
STEP 1 Turnonthetransmitterandadjusttolicensedpower.
STEP 2 Withtheexcitersoperating,usethewebbrowsertoaccesseachexciterGUIand
recordtheoutputlevelsforexcitersAandB(ifpresent).Theseex citerlevelswere
calibratedatthefactory.
STEP 3 ThetransmitterGUIexciteroutputiscalibratedontheSysPwerCalibratescreen.
AccesstheSysPwrCalibratescreennavigatingtoSystem>SystemService>System 
Setup>SystemPowerCali brate.Thescreenisshownin
Figure5‐14onpage5‐23.
STEP 4 Tocalibrate,presstheactiveexcitermeterwindowandentertheoutputpowerlevel
notedontheexciterwebbrowserscreens.
STEP 5 Endofprocedure.
5.10.4 PDUCalibration
Thepredriverunit(PDU)hasaforwardpowerdirectionalcouplerforeachpreampmoduletomeasureinputpower.
ThispowerreadingisgivenontheSystem>SystemService>CabinetSetup>CabinetPowerCalibratescreenshownin
Figure5‐1.
Note
This value is preset at the factory. Should it need to be reset in the field use this procedure.
STEP 1 Turnonthetransmitterandadjusttolicensedpower.
STEP 2 RemovethecableattheoutputofthePDUsplitter(behindthePDUchassis)anduse
anaveragepowermetertomeasurethesplitterpoweroutput.
STEP 3 Reconnectthecable.
STEP 4 GototheCabPwrCalibratescreen(Figure5‐1)andcheckthePDUdetectorvaluefor
theactivePDUwhichshouldbebetween1and3.2V(setatfactoryandvarieswith
transmittermodel).ThisvoltagecomesfromdetectorsattheinputofeachPDU.
Enterthevaluemeasuredin
STEP3inthenumericentrybox.
Note
This voltage is used as a reference to indicate exciter power output. If too low the transmitter ALC will not
adjust in Auto. If less than a factory set threshold it assumes there is an exciter issue and disables ALC.
STEP 5 PressthewindowoftheactivePDUinputtobecalibratedandenterthevalues
determinedinSTEP5.ThevalueenteredshouldbeinuW(microWatts).
STEP 6 PressDONEtostorethechangesorCANCELtodiscardthechanges.
STEP 7 Selecttheotherpredriverandrepeattheproceduretocalibratetheotherpredriver
poweroutput.
Figure 5-1 Cab Pwr Calibrate Screen
STEP 8 Endofprocedure.