Specifications

Section-5 Maintenance
November 11, 2013
5‐14
Copyright©2013,HarrisBroadcast
WARNING:Disconnectprimarypowerpriortoservicing. 888‐2628‐300
Figure 5-8 Typical Output Power Coupler
5.9.2.1 CalibrateSystemForwardVisualPower
STEP 1 Calibratethepowermeterfo llowingmanufacturersinstructions.
STEP 2 Setthemeteroffsettothevalueprintedonthecoupler,orassuppliedwithadata
sheetincludedwiththefactorytestdata.
STEP 3 Removethesamplecablefromthesystemforwarddirectionalcoupler(afterfilter)to
becalibrated(see
Figure5‐8).
STEP 4 Connectthepowermeterprobetothesystemforwarddirectionalcouplerport.
CouplerdesignsliketheoneshowninFigure5‐8musthave50ohmterminationson
theportoppositethemeasurementport.Thepowermeterprobemustbesupported
topreventdamagetoconnectors.
STEP 5 Disablethesound(aural)carrierviatheApexM2Xcontrolscreens.
Note
The M2X exciter must be controlled via a web browser. See the M2X manual for detailed instructions.
STEP 6 Select0%APL(BlackLevel,nosetupforNTSCcases)atvideogenerator.Connectto
videoinput.
STEP 7 PressandholdthepowerLOWERbuttonfor40secondsornavigatetoOutputscreen
andsetCab.Ref .Pwr.tozero.Eitherofthesestepswi llinsurethatthetransmitter
doesnotproducelargeamountsofRFpoweratturnon.
STEP 8 Verifythepoweroutputwiththepowermeterattachedtotheforwardportofthe
systemoutputdirectionalcoupler.Turnonandwhilemonitoringcabinetreflected
power,slowlyadjusttheMaxivaanalogtransmitteroutputuptolicensednominal
power(asprogrammedintheSystemSetupscreen).Ifhighlevels
ofcabinetreflected
powerarenoted,stopraisingpower,abadload,transmissionlineconnection,or
antennaisindicated.
Note
At Black level, the peak vision carrier power can be calculated by dividing the measured average power
displayed on the power meter by one of the factors found in
Section 5.9.1 on page 5-12. Note that the Sys
Vision Power (kWpk) entered on the System Setup screen is peak power derived from this division.
Coupler
Reflected
Forward
Coupler