Sharp SD-AT1000W Especificaciones descargar pdf (Pagina 104)

Section-3 Operation

October 17, 2013

3‐36

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

3.7.5.1 NonlinearCorrectionRangeSetup

Themodulatoroccasionallygeneratespeaksashighas18dBabovetheaverageoutputlevel.Thesignalpeakpower

abovetheaveragesignalpowerlevelcanbelimitedatthemodulatoroutputbypropersettingofthenonlinear

(correction)range.SincethislimitationtakesplacebeforetheRTACcorrectioncircuitry,onlythera

ngeofmagnitude

uptothislimitwillbelin earizedbynonlinearRTACcorrection.

Table3‐25XmtrHome>ExciterHome>Setup>DUC/RTAC>Nextx2

Field Explanation

PeakR

eduction

Control

On/Off:Pe

akReductionlimitstheRFpeakpoweroutputofthetransmittertoprovide

optimumRTACperformance,whi lepreventingnuisancetransmitterPAoverdrivetrips.In

mostcases,defaultsettingsshouldbeused.

Non‐Line

arRange(dB)

GreenifEn

abled.SetindB.Defaultvaluesaretypicallyused:

ATSC=7dB

OFDM=8dB

DAB=6dB

MaxCr

estFactor(dB)

MaxCr

estFactor(dB):SetindB.Defaultvaluesaretypicallyused:

ATSC=11dB

OFDM=13dB

Downconverter

BandpassFilter

On/Off:TheIFba

ndpassfilterintheRFdownconverterfiltersoutmixingproductsfrom

thedownconversion.Thisfilterhasaslightfrequencyresponseirregularitywhichaffects

thelinearcorrection.ForUHFchannelswithnoadjacentchannelsonthepost‐filter

feedback,thisfiltercanbeoff.Otherwisethisfiltermus

tbeon.

RTACPr

ofiles:Profilesareuse dtotunetheRTACforvariouslinearandnonlinearoperatingconditions.Profilechoicesfor

linearandnon‐linearcorrectionareavailable.ThecorrectprofilewillimproveRTACperformance.

Linear

Dropmenuandselect:Basic,Short,Long,Max,BasicOffset,ShortOffset,LongOffset,Max

Offset.

Nonlinear

Dropmenuandselect:Basic,BasicMemory,Profi le3,Profile4,High,HighMemory,Profile

8,Profile9.

ModeSelect

edafterACMainsLoss

Linear Linear:Dr

opmenuandselect:Bypass,Adapt,Stored

Nonlinear Nonlinear:Dr

opmenuandselect:Bypass,Adapt,Stored

LPURT

ACOperatingModesDuringPowerUp:WhentheLPUispowereddown,RTACcorrectionfortheAdaptandHold

modesislost,butthestoredRTACcorrectionsarenotlost.Atpowerup,thetransmittermustoperateuncorrectedfora

fewminuteswhil eRTACadapts.IfRTACpoweronmodeissettoSt

ored,andifanappropriatecorrectionsetuphasbeen

previouslystoredinmemory,theStoredcorrectionwillbeloadedintotheRTACAdaptandHoldcircuits.Thiscorrection

willthenbecomeavailablefortheLPURTACoffairHoldmodeorfortheAdaptmodeiftheLPUisontheair.

PowerOnLinea

rMode

TheRT

ACPowerOnLinearModeselectiongivestheoptionofhavingtheexciter'slinear

RTACcorrectionintheAdapt,Stored,orBypassmodewhentheexciterispoweredon.In

theStoredmode,RTACsettingsareobtainedfrompreviouslystoredvaluesfromoneofthe

filtersetsintheStoredCorr

ectionSetssubwindow.

PowerOnNonlinear

Mode:

TheRT

ACPowerOnNonlinearModeselectiongivestheoptionofhavingtheex citer's

nonlinearRTACcorrectionintheAdapt,Stored,orBypassmodewhentheexciteris

poweredon.IntheStoredmode,RTACsettingsareobtainedfrompreviouslystoredvalues

fromoneofthefiltersetsintheStoredCorr

ectionSetssubwindow.

FrequencyRe

sponseTilt EntervalueindB.

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