Specifications

Maxiva ULX Series
November 11, 2013
5‐19
888‐2628‐300 WARNING:Disconnectprimarypowerpriortoservicing.
Copyright©2013,HarrisBroadcast
STEP 1 Repeattheaboveprocedureusingtheinternal(cabinet)forwardandreflected
couplersamples(see
Figure5‐11onpage5‐16)tocalibratethereflectedpoweratthe
cabinetoutput.
Note
The detector level should be between 2-3V at rated visual forward power when the reflected cable is
attached to the forward port with a 10 dB pad. If there are pads on the forward port to start with they
should not be included with the added 10dB pad.
STEP 2 Enterthe10%ofmeasuredforwardcabinetpowervalueinthewindowforCabRefld
(W).
STEP 3 Endofprocedure.
5.9.4 ExciterOutputCalibration
STEP 1 Turnonthetransmitterandadjusttonominalpower.
STEP 2 Setthevideogeneratortoblackpicture,nosetup.
STEP 3 Withtheexcitersoperatingusethewebbrowsertoaccesseachexciterandrecord
theoutputlevelsforex citersAandB(ifpresent).Theseexciterlevelswerecalibrated
atthefactory .
STEP 4 ThetransmitterGUIExciteroutputiscalibratedontheSysPwrCalibratescreen.To
accesstheSysPwrCalibratescreenpressSystem>SystemService>System
Setup>SystemCalibrate.Thescreenisshownin
Figure5‐9onpage5‐15.
STEP 5 Tocalibrate,pressthewindowoftheactiveexciteroutputtobecalibratedandenter
thevaluesnotedontheexciterwebbrowserscreens.
STEP 6 Endofprocedure.
5.9.5 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PwrCalibratescreenshownin
Figure5‐1.
CalibrationProcedure:
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 Setthevideogeneratortoblackpicture,nosetup.
STEP 3 RemovethecableattheoutputofthePDUsplitteranduseanaveragepowermeter
tomeasurethesplitterpoweroutput.
STEP 4 Reconnectthecable.
STEP 5 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4V(setatfactoryandvarieswith
transmittermodel).ThisvoltagecomesfromdetectorsattheinputofeachPDU.
Note
This voltage is used as a reference to indicate exciter power output. If too low the transmitter ALC will not
adjust in Auto mode. If less than a factory set threshold it assumes there is an exciter issue and disables
ALC.
STEP 6 Dividethemeasuredaveragepoweroutofthesplitterbytheappropriatefactor
fromSection5.9.1onpage5 ‐12.
STEP 7 PressthewindowoftheactivePDUinputtobecalibratedandenterthevalue
determinedin
STEP6.ThevalueenteredshouldbeinuW(microwatts).
STEP 8 PressDONEtostorethechangesorCANCELtodiscardthechanges.