Specifications

Maxiva UAX
October 17, 2013
3‐57
888‐2693‐004 WARNING:Disconnectprimarypower priortoservicing.
Copyright©2013,HarrisBroadcast
Figure 3-56 LPU DVB-T2 Setup Screen 4
Table3‐45XmtrHome>ExciterHome>Setup>DVB‐T2Modulator>Nextx3(screen4)
Field Explanation
FFTMode
Choicesar
e1K,2K,4K,8K,16K,or32K.
Thisref
erstothenumberofsubcarriersintheRFoutputbandwidth.SeeTable3‐46onpage3‐57.
GrdInt
erval Choicesare1/4,1/8,1/16,1/32,1/128,19/128,or19/256.
PilotP
attern ChoicesarePP1,PP2,PP3,PP4,PP5,PP6,PP7,orPP8.SeeTable3‐48onpage3‐58.
CarrierMode Choicesar
eNormalorExtended.
DataSymbolsper
T2frame
Programmingra
ngevarieswiththeFFTsizeandtheguardinterval.Themaximumnumberofdata
symbolsperT2frameisgiveninthetablebelow.Anoddnumbermustbeentered.Ifanevennumberor
anumberwhichisoverthelimitisentered,theexciterwillmute.Alargernumberismoredata
efficient,butitalsoincreasesreceiverlockuptime.
T2Framesper
Superframe
Asuper‐frameiscomposedofasetofT2‐framesconsistingofaparticularnumberofconsecutiveT2‐
frames.Asuper‐framemayincludeFEF(futureextensionframes)parts,twoFEFpartscannotbe
adjacent(mustbeseparat edbyoneormoreT2frames),andifFEFsareused,thesuper‐frameends
withaFEFpart.Themaximumtimeforthesuper‐framelength(TSF)is64secondsifFEFsarenotused
(equivalentto255T2framesof250ms)and128secondsifFEFsareused.ThemaximumnumberofT2
framesareindependentofthenumberofFEFpar
tsused.
Bandwidth Presently5MHz,6MHz,7MH
z,and8MHz,inthefuture1.7MHzbandwidthwillbeadded.
L1Mod
Choicesar
eBPSK,QPSK,16QAM,or64QAM.TheL1Modreferredtoabovegivesachoiceofthe
modulationconstellationfortheP2symbol(s).
L1ref
erstotheLayer1signallingwithintheT2frame.L1issplitintothreemainsections:TheP1
signalling,theL1‐presignallingandL1‐postsignalling.ThetheL1‐preandpostsignallingiscarriedby
theP2symbol(s),whichmayalsocarrydata.
PAPR
Choicesar
eNone,ACE,TR,orACE&TR.PAPR=peaktoaveragepowerratio.Thischoiceallowstwo
methodsofpeaktoaveragepowerratioreduction.
TR=To
neReservation
ACE=Activ
econstellationextension,Theactiveconstellationextensiontechniqueshouldnotbe
appliedwhenrotatedconstellationsareusedorwhenMISOisused.
Table3‐46NumberofCarriersandCarrierSpacing
FFTMode(No.Carriers) 1K 2K 4K 8K 16K 32K
TheoreticalMax.Ca
rriers 1024 2048 4096 8192 16384 32768
No.CarriersNormalMode 853 1705 3409 6817 13
633 27265
No.CarriersEx
tendedMode N/A N/A N/A 6912 13920 27840
SpacingBet
weenCarriersHz. 8929 4464 2232 1116 558 279