Specifications

Maxiva UAX
October 17, 2013
3‐53
888‐2693‐004 WARNING:Disconnectprimarypower priortoservicing.
Copyright©2013,HarrisBroadcast
Figure 3-52 LPU DVB-T Setup Screen 8
.
Table3‐41XmtrHome>ExciterHome>Setup>DVB‐TModulator>Nextx7(screen8)
Fields Explanation
Thesesp
ecialtestmodeswillcauseerrorsandshouldnotbeusedinnormaloperation.
SpecialTe
stFlag
ChoicesareNone,TestSync,andTestSpectrum.None:Nospecialtestsareselected.TestSync:
OneOFDMpacketatthebeginningofeachMega‐Frameisdeleted.Thishelpstomeasure
alignmentofUAXoutputinSFNmode.
TestSpectrum:Su
b‐carriersincenterofbandaredeletedtocreateaspectralnull.Thisisusedto
evaluatespectralregrowthduetotransmitterorothernon‐lineardistortion.
PRBSTest
ChoicesareOnorOff.PRBS(PseudoRandomBinarySequence)Ongeneratesatestpattern
insteadofprocessinganinputstream.Itisonlyusedbyfortesting.Onisselectedwhen
transmitterRFoutputisdesiredbutavalidtransmissionstreamisnotavailable.WhenOnis
selectedthePRBSTe
stboxwillturnyellowontheGUIdisplay.Sincethisisatestmodeitwill
showupinthefaultloguponactivation.Itwillalsocauseanamberflashingoutputlightonthe
frontoftheUAXandthesystemfaultLEDwillalsolightontheUAX.
ThePRBSte stfunctionshouldnotbeenabledduringnormaloperationwitha validtransport
stream.IfapowerinterruptionoccurswiththePRBStestmodeenableditwillbeautomatically
disabledwhensystempowerisrestored.

PRBSBits 20isdefaultvalue.
TestPatt
ern
SingleTo
ne:Test mode.
OffsetTo
ne :Testmode.
StopTe
st:Stopstestpatterns.