Simrad ES70-7C - INSTALLATION REV B Installation Manual Page 59

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Operationalprocedures
3OntheLinestab,observethevariousverticalmarkersthatcanbeenabled.
Note
TheannotationsarecontrolledontheAnnotationdialog,buttoplacetheannotations
intheechogram,youmustenablethemintheEchogramdialog.
4Enabletheverticalmarkersyouwishtosee.
5ClickOKtosavethecurrentsettingsandclosethedialog.
SelectingTVGgainintheEchogramdialog
TheTVGcanbechosenusingtheEchogramdialog(describedhere),orwiththeTVG
buttonontheActivemenu.
AdjustingtheTVGgainontheActivemenuonpage69
TVGmeansTimeV ariedGain.
ThewholeideawithTVGisthatechoesfromshshallhavethesameecholevel(colour)
independentoftheirdepths.
TheES70hasaTVGrangedownto15000meters,whichforallpracticalpurposesis
unlimited.TheES70doesnothaveaTVGcompensatedreceiverlikemostotherecho
sounders.IntheES70theTVGismadeinsoftwareaftertheechoesfromthereceiver(s)
havebeenconvertedtodigitalformat.Inordertomakethisworkthereceivermust
haveverylargedynamicrange.
ThefollowingTVGsettingsareavailable:
aPower(NoTVG)
TVGgainisnotimplemented.Thissettingishardlyeverused.
bSchool(20logTVG)
Thisgainsettingoffersweakeramplicationclosetothebottom.Ithasbeen
designedtoprovidethebestechoesforschools.Thephysicalsizeofaschoolallows
youtodetectitevenwithreducedgain.
cFish(40logTVG)
Thisgainsettingprovideslargeramplicationclosetothebottom.Ithasbeen
designedtoprovidethebestechoesfromsinglesh.
dTargets(40logTVG)
Basically,thissettingusesthesameTVGamplicationasFish,butadditional
lteringandcompensationisimplemented.Onlyechoesdetectedandinterpretedas
singleshareshown.Theechoesarecompensatedfortheirphysicalpositioninthe
beam(beamcompensation).Thismeansthatshintheouterregionofthebeamare
adjustedtocorrectsizeeventhoughtheirechoesareweaker.
NotethatthisTargets(40logTVG)settingisonlyfunctionalwithsplitbeam
transducers.
343539/C
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