Specifications

Section-3 Operation
October 17, 2013
3‐14
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Table3‐7Home>Service>Config&ConfigPage2
Field Explanation
ConfigurationSc
reen1
FwdPowerLowWarning
(W)
Setthemi
nimumforwardpowerinwatts(W)belowwhichawarningisindicated.Ifthe
transmitteroutputpowerdropsbelowthislevel,theForwardPowerBarandOutputLEDwill
turnyellow.
FwdPwrLowFault
Setthemi
nimumforwardpowerinwatts(W)belowwhichafaultisindicated.Ifthe
transmitteroutputpowerdropsbelowthislevel,theForwardPowerBarandOutputLEDwill
turnred.
MaxFw
dPower(W)
Setthemaximumforwardpowerinwatts(W)abovewhichafaultisindicated.Ifthetransmitter
outputpowerexceedsthislevel,theForwardPowerBarwillturnred.Thisvaluemustbelarger
thantheNominalPowerOutput.
NominalPo
werOutput
(W)
Thisen
trysetsthemaximumlevelthattheFwdPowerReferencecanbesettoinwatts(W),and
alsosetsthe100%ForwardPowerBarlevel.
Thislevelisaveragepowerfordigitalmodulationsandpeakofsync.powerforanalogsystems.It
isusedtoprotectsubsequentamplifiersfrombeingoverdriven,andtosetalimittotransmitter
outputpower.
FwdPo
werReference(W)
Setth
edesiredforwardpowerofthetransmitterinwatts(W).TheFwdPowerReferencesetting
islimitedbytheNominalPowerOutputsetting,thusthevalidrangeforthiscontrolis0‐
NominalPowerOutput(W).IfDVB‐TMIPpowercontrolisonthentheFwdPwrReference
settingwi
llbedisabled.
ActualFw
dPower
Reference(W)
Thisfieldre
presentstheactualpowersettingintheLPU.Theactualpowersettingcanbe
reducedfromtheFwdPowerReferencesettingduetoanyofthefollowingreasons:
‐Theva
lueofthe%ofFwdPwrReferencesettingislessthan100%.
‐Thenumberofmissing/faultedPAshasreducedthemaximumoutputpowerofthesystem
belowtheFwdPwrReferencesetting.
‐Ther
eexistsaPowerFoldbackduetohighReflectedPower.
%ofFwdPwrRe
ference
(%)
Setthepe
rcentageofactualtransmitteroutputpower.(Validrange0‐100%)IftheFwdPower
Reference=1000W,andthe%ofFwdPwrReference=75%,thentheactualforwardpower
referencewillbe750W.
Frequency
Setcent
erfrequencyherefordigitalchannels.Setvisualcarrierfrequencyhereforanalog
operation.FrequencyvaluesethereissenttoLPUs.
Configuration2
RefldPwrFo
ldback(W)
Thisisth
elevelofReflectedPowerthatifexceededwillactivatepow erfoldback.(Thisisastatus
onlyfield).
NOTE:Mak
econfigurationsettingsbyclickingintoafieldandenteringthedesirednumerical
value.
FoldbackThr
eshold(FWD
%)
Thisle
velrepresentsthepercentageofreflectedpowerthatcanbetoleratedbeforeinitiating
foldback.Itcanbesetfrom1to4%.Fourpercentisthemaximumreflectedpowersetting
allowed(approximately1.5:1VSWR).Areflectedpowerlev elof1%correspondstoa1.22:1
VSWR.Asystemfoldbackthresholdsettingof4%me
ansthatreflectedlevelsgreaterthan4%
wouldinitiateafoldbackoftransmitteroutputpower.
MaximumF
oldback(%)
Thisisthemaxi
mumamountoffoldbackallowed.MaximumFoldbackcanbesetbetween50
and100%.PowerfoldbackoccurswhentheFoldbackThreshold,describedabove,isreachedor
surpassed.Foldbackallow sthetransmitterpoweramplifier(s)tooperateatasafe(reduced)
outputpowerlevelwhenhighVSWRconditionsoccur.A100%fo
ldbacklevelmeansthepower
outofthetransmitterwouldbezero.A50%foldbacklevelwouldreducethetransmitteroutput
powertohalfpower.
Fold backRe
leaseTC(s)
Thisistheam
ountoftime,inseconds,thatthecontrolsystemwaitsafterfoldbackisactivated
beforeattemptinganoutputpowerincreasestep.Therangeis5‐120seconds.Defaultis120
seconds.