Sharp SD-AT1000W Spécifications télécharger pdf (Page 136)

Section-3 Operation

October 17, 2013

3‐68

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

Caution

CHANGING THE SOUND CARRIER AND CARRIER LEVEL SETTINGS ON THE

MONO CARRIER SETUP SCREEN WILL CAUSE THE TRANSMITTER TO

MUTE TEMPORARILY.

Figure 3-64 LPU Analog Setup Screen 3 Mono

Table3‐61XmtrHome>ExciterHome>Setup>AnalogModulator(screen3Mono)

Field Explanation

MonoCarr

ierSetupSubWindow (Screen3)

SoundCarri

er1

ChoicesareOfforOn.

Offisus

edtoturnthesoundcarrierofffortestpurposes.

Carrier1Level

Valueent

eredin‐dB.

RepresentstheamplitudeadjustmentofthesoundcarrierlevelindBrelativetopeaksyncofthe

visioncarrierrange.

Procedure:

Step1:Di

splaythechannelspectrumonaspectrumanalyzer.

Step2:Setvisu

alcarrierpeakofsyncreferencelevelto0dBm.

Step3:Adj

usttheCarrier1Level(soundcarrierlevel)toachievethedesiredpeakvisualto

soundcarrierratio.

DeviationLimiter

Threshold

Choicesar

eOff,60kHz,90kHz,or120kHz.

Thisfun

ctionwilllimitthesoundcarrierfrequencydeviationtothevalueselectedandprevent

soundcarrieroverdeviation.

AFGainSubWindow(Screen3)

AFSN

Valueent

eredindB.

Thevalueenteredinthiswindow(rangeof‐9.9to+6dB)isintendedtochangetheAFSound1

inputgainsothattheadjustedsignallevelwillbe0dBm.

Iftheactualinputlevelisotherthan0dBm,theAFSND1(Sound1gain)mustbeadjustedto

changetheinputlevelto0dB.Whentheinputlevelhasbeencorrectlyset,thedeviationwillbe

+/‐50kHzforPALand+/‐25kHzforBTSC.

Forexa

mple,iftheactualinputlevelis‐6dBm,setAFSND1(gain)to+6dB,toproducecorrect

audiodeviation.

DetectorDec

Choicesar

eFastorSlow.

ThisdefinesthespeedatwhichtheDeviationSoundCarrier1indicationreturnstozero.

Preemphasis

Choicesar

eOff,50us,or75us.

Thisch

oicesetsthepreemphasisofthemodulationofthemonauralsoundcarrier.

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