Sharp SD-AT1000W Specifikace stáhnout pdf (Strana 121)

Maxiva UAX

October 17, 2013

3‐53

888‐2693‐004 WARNING:Disconnectprimarypower priortoservicing.

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.

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Sharp SD-AT1000W Specifikace Strana 121