Specifications

Maxiva ULX Series
November 11, 2013
5‐27
888‐2628‐300 WARNING:Disconnectprimarypowerpriortoservicing.
Copyright©2013,HarrisBroadcast
5.10.5 SystemThresholdSettings
Figure 5-16 Threshold Setting Screen
5.10.5.1 ExciterA&BThresholdSettings
ExciterAandBdetectorlevelsshouldbeapproximately2.7V.Thisassumesa100mW(average)out.
ExciterAandBthresholdlevelscanbesetusingthefollowingsteps:
STEP 1 Settheexcitertonominaloutputpower(approximately100mWaverage).
STEP 2 Lowerexciteroutputpowerto50mW(usethewebbrowserGUIscreens).
STEP 3 PressthethresholdExciterPwrCalwindowandadjustthevalueupward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 4 LowerthethresholdCalwindowvaluein.05VincrementsuntiltheredLEDonthe
exciterswitchercardgoesout.
STEP 5 Pressdonetoacceptthislevel.
STEP 6 Restoretransmittertonormaloperatingconditionandresettheexciteroutput
powertonominal.
STEP 7 Endofprocedure.
Table5‐5System>SystemService>SystemSetup>SystemThreshold
Field Explanation
FoldbackPwr
Setspwrlevel(Watts)wherepowerfoldbackbegins.Maximumvalueis2.8%ofnominaloutputpower,
foraVSWRof1.4:1.Fora6kWdigitaltransmitterthiscorrespondstoareflectedpowerlevelof168W.
FwdLowFlt Setspowerlevelwherepowerbarturnsredandafaultisenteredintothelog.
FwdLowWarn Setspowerlevelwherepowerbarturnsyellow.
FwdHighFlt Setspowerlevelwherepowerbarturnsredandfaultisenteredintolog.
ExciterA,BPwr
Setsvoltagethresholdwhereexciterswitchwilloccur.SeeSection5.10.5.1onpage5‐27for
instructions.
RfldPower
Thisvaluemustbesetbythecustomer.Systemreflectedthresholdvoltage,tosettheVSWRtrippoint,
shouldbesettoapproximately100mVlessthanthedetectorvoltagelevelnotedin"5.10.2.1Calibrate
SystemReflectedPower"onpage5‐24.Approximately2.4Vistypical.Fora6kWdigitaltransmitterthis
correspondstoareflectedpowerlevelof578W,foraVSWRtrippointof1.9:1.