Specifications

Section-3 Operation
October 17, 2013
3‐42
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Table3‐29XmtrHome>ExciterHome>Setup>ATSCModulator>Next
Field Explanation
Screen1ATSCControl
PowerOnInput Configureswhichinputwillbeusedafterapowerfailure.
ActiveInput
Selectswhichinputistobeusedactivelybythemodulator.
Inputchoicesandrearpanelconnectorsareshownin"2.9.5ProgramandReference
Connections"onpage2‐10. Theinputavailabilityandfunctionalityvarywit
hmodulation
type.Theseinputsarenotavailableforanalogmodulation.
AuxiliaryInput
ThisisthebackupinputtosubstituteforthePrimaryiftheSwitchingModeissetto
Automatic.
SwitchingMode
Choicesare:Automatic)orManual.SelectshowtheUAX‐Cistochangeinputsiftheselected
inputislos
t.IntheAutomaticmode,ifoneinput(Primary‐ActiveorAuxiliary)ismissingand
theotherispresent,theinputchoicewillautomaticallyswitchtotheinputwhichispresent.If
bothinputsarepresent,thePrimary(Active)inputwillbeselected.
ATSCMobileDTV ChoicesareEnableorDi
sable.
NetworkOperation ChoicesareMFN(MultiFrequencyNetwork)orSFN(SingleFrequencyNetwork).
PilotTestTone ChoicesareOnorOff
MuteonLossofTS ChoicesareOnorOff.Oncausestransmittertomuteiftransportstreamislost.
Screen2
TierID
Tierofthenetworkthatthistransmitter/excitercorrespondstoinaccor
dancewithATSC'sA/
110standard.ThisdatamustmatchthetiersettingthathasbeensetupintheDis tributed
TransmissionAdapterups tream.
TxID
DesignateswhichtransmitterthisisinaccordancewiththeDistributedTransmissionnetwork
design,inaccordancewithATSC'sA/110standard.ThisTierandTransmittermustmatchth
e
tierandtransmittersettingsthataresetbackatthestudioornetworkcontrolpointinthe
DistributedTransmissionAdapterforthistransmitter.
XmtrandAntennaDelay
Enterthedelayvalueinmicroseconds.ThisisthethroughputdelayoftheRFsignalafterit
leavestheexciternetworkdelaycircuitandtravelsthroughtherestofthetransmitter,
transmissionline,andantenna.Itisalsoknownas“TAD”,thisisacalculatedorestimated
numberthatisincorporatedincompliancewiththeATSCA/110DistributedTransmission
standard.Theexciterwillusethisvalueaspartofit'scalculationofemissiontime.
DF
SPulseout10MHzport
ChoicesareEnableandDisable.Enablingthisfunctionwilldisablethe10MHzsignalcoming
outofthefrontpanel10MHzportandreplaceitwitha77uSpulsethatiscoincidentwiththe
emissionoftheDataFieldSyncportionoftheATS
Csignal.Usingthissignalalongwiththe1
PPSsignal,onecoulduseanoscilloscopetoadjustemissiontimingbetweentwoormore
singlefrequencynetworksites.
A/110FldRateSideChCtrl:
ChoicesareEnableandDisable.ATSC'sA/110standarddefinesasidecommunication
channel,calledthefieldratesidecha
nnel(FRSC).TheFRSCmaybeusedtopopulatecertain
symbolsinthedatafieldsyncorcommunicateotherinformationtothemodulatore.g.
configurationchanges.However,informationtopopulatetheFRSCmustbesentfromthe
upstreamDistributedTransmissionAdapteroraMobileDTVmultiplexer.Thiscontrolgoverns
whetherornottheFRSCinformationisused.IftheupstreamadapterisnotinsertingtheFRSC
information,settoDisable.