Specifications

Maxiva ULX Series
November 11, 2013
5‐21
888‐2628‐300 WARNING:Disconnectprimarypowerpriortoservicing.
Copyright©2013,HarrisBroadcast
5.9.6.1 ExciterA&BThresholdSettings
ExciterAandBdetectorlevelsshouldbeapproximately2.7V.Thisassumesa200mW(analog) out(blackpictureno
setuponNTSC).Thesedetectorvalueswillvarydramaticallywithnormalpicturetransmission.
ExciterAandBthresholdlevelscanbesetusingthefollowingsteps:
STEP 1 Settheexcitertonominaloutput200mWpeakvisual,blackpicture.
STEP 2 Lowerexciteroutputpowerto100mW(usingthewebbrowserGUIscreens).
STEP 3 Switchvideogeneratortowhitepicture.
STEP 4 PressthethresholdCalwindowandadjusttheCalvaluehigherin.1Vincrements
untiltheredfaultLEDontheTCUexciterswitchercardlights.
Note
To view the LED on the exciter switcher card the front panel of the TCU must be pivoted downward.
STEP 5 LowerthethresholdCalwindowvaluein.05VincrementsuntiltheredLEDonthe
exciterswitchercardgoesout.
STEP 6 Pressdonetoacceptthislevel.
STEP 7 Restoretransmittertonormaloperatingconditionandresettheexciteroutput
powerto200mW(ortothevalueitwaspreviouslyat).
STEP 8 Endofprocedure.
5.10 DigitalPowerCalibrations
Otherthansystemforward&reflectedcalibrationsduringinstallation,powercalibrationshouldberequiredonlyif
theRFdetectorboard(inTCU),oradirectionalcouplerorsignalcableisreplaced.However,calibrationissimpleand
canbedonewheneveritisdeemednecessary.Theonlyrequiredpowercalibrationsare:
a. SystemForwardPower(afterfilters)
b. CabinetForwardPower(beforefilters)
c. SystemReflectedPower(afterfilters)
d. PACabinetReflectedPower(beforefilters)
e. ExciterForwardPower
f. PDUForwardPower
Note
Forward and Reflected power calibrations should only be done while operating the transmitter into a
known good load or a low VSWR antenna system.
5.10.1 ForwardPowerCalibration
EquipmentUsed:
• MaxivaSeriesprecisiondirectionalcouplers(precisionmeaningthatthecouplingratiohasbeenmeasuredat
theexactoperatingfrequency)
• Averagingpowermeterwithpowerprobe
Note
Power calibrations must be performed using the local GUI screen. In order to change calibration settings
the user must supply a login and a password. When the transmitter ships from the factory the local GUI
default login is "admin" and the default password is "admin" (do not include quotation marks in login or
password). The default password allows setting of remote passwords only. Refer to
"3.2.2 TCU - Initial
Login & Passwords" on page 3-2. You will not be able to make changes or have remote access without
changing the default username/password.