User manual

SimradES70
Parameters
1Channel
Thiscolumnspecieswhichtransceiver(s)youareusing.Thetextstringprovides
thefollowinginformation:
•TransceiverID
•Transceiver'sIPaddress
•Transducername
2Mode
Thiscolumnspeciesthecurrenttransceivermode.Youcanmanuallyselectamode.
aActive
Thetransmitterandreceiverarebothactive(normaloperation).
ThiswillmaketheES70operateasspeciedbytheOperationfunction.See
Operationonpage165foralistofoperationalmodes.
bPassive
Thetransmitterispassivewhilethereceiverisactive.
TheES70willreceiveandcomputethesignalsdetectedbythetransducer(s).
Thismodeisthususefulfortestpurposes,andwhenyouwishtomeasurethe
ambientbackgroundnoiseinthesea.ItcanalsobeusefultoruntheES70in
Passivemodetodiscriminatebetweentargetechoes(presentonlyinActive
mode)andnoise(presentinbothActiveandPassivemodes).
Tip
Ifyouwishtoinvestigatetheambientnoise,choosePassivemodeinthe
NormalOperationdialog.Anynoiseordisturbanceinthewater–withinthe
transducer'sfrequencyrange–willthenbedetectedandshown.Thisfeature
willforexamplebeabletopickupdisturbancesfromotherhydroacoustic
systemsonyourownvessel,oronothervesselsinthevicinity.
cTest
Thetransmitterispassivewhilethereceiverisactive.
EachGeneralPurposeTransceiver(GPT)boardincludesasignalgenerator
injectingaweaktestsignal(-70.0dBW)intothereceiver’sinputcircuitry.The
nominalpowerreadingatthedisplayis-70.0dBWforchannelsusingone
transceiverboard(1kWsinglebeam)and-64.0dBWforchannelsusingfour
boards(4kWsinglebeam,4kWsplitbeam).
Notethatthisfeatureisdisabledonsomehigh-frequenttransceiversinorder
toimprovetheperformance.
→Testandmaintenanceonpage106
ThismodeisnotdesignedforoperationalusewiththeES70.
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