User Manual

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GuardianManual001‐5006‐000Rev0 39|Page
TxOnlyRadio
TheTxOnlyRadiooptiondisablestheradio’sreceiverandanyabilityforthemodemtoreceivedata.Thisfunction
isprovidedforusewiththeTxunitincorporatedintoaT‐BaseorT‐Base/R.
RxOnlyRadio
TheRxOnlyRadiooptiondisablestheradio’stransmitter
andanyabilityforthemodemtotransmitdata.This
functionisprovidedforusewiththeRxunitincorporatedintoaT‐BaseorT‐Base/R.
PTTWatchdog
ThePTTWatchdogallowstheusertosetthemaximumtransmittime.Thisisusedtoprotectagainsta‘stuck’
transmitter.
Thetimeisselectedbyasliderbar.Therangeis0to120secondswithadefaultof30seconds.
Warning:Transmissionslongerthan30secondsmayexceedthedutycycleratingofthetransmitterandleadto
shortenedlifeortransmitterfailure.Afactory‐installedcoolingfanisavailable
forextendeddutyoperations.For
continuous‐transmitapplications,thePTTWatchdogfeaturecanbedisabled(unchecked).
Synthesizer
Thisfieldliststhesynthesizermodelused.Thisfieldisnon‐selectableandforreferenceonly.
DynamicCarrierDetectOffThreshold
TheDynamicCarrierDetectOffThresholdallowsthemodemtoautomaticallyadjust
theCarrierDetectOff
ThresholdbasedontheRSSIwhilereceivingdata.Ifselected,theCarrierDetectOfflevelwillautomaticallyadjust
toapproximately15dBbelowtheactualsignalstrength.Thisprovidesrapiddetectionofloss‐of‐carrierand
minimizesoreliminates‘bitdribble’attheendoftransmissions.
Recommendation:
KeepDynamicCarrierDetectOffThresholdenabled(checked)unlessinterferenceorvariable
signalstrength(i.e.,fadinginamovingvehicle)causesproblems.
CarrierDetectOnThreshold
CarrierDetectOnThresholdindicatesRSSIlevelwhenacarrierisfound.ThislevelshouldbemorethantheCarrier
DetectOffThreshold.
CarrierDetectOffThreshold
CarrierDetectOffThresholdindicatestheRSSIlevelwhenacarrierislost.ThislevelshouldbelessthantheCarrier
DetectOn.
5.1.4.5 SETUPRADIO/MODEMFREQUENCIES
TheFrequenciestabprovidestheinterfacetoprogramfrequencypairsandtheircorrespondingpowersettings.
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