Simrad EK15 - Page 213

Functionsanddialogboxes
Parameters
1TVG
ThiseldallowsyoutodenetheTimeVariableGain(TVG)curveappliedtothe
receivedechoes.
ThefollowingTVGsettingsareavailable:
aPower(NoTVG)
TVGgainisnotimplemented.Thissettingishardlyeverused.
bSchool(20logTVG)
Thisgainsettingoffersweakeramplicationclosetothebottom.Ithasbeen
designedtoprovidethebestechoesforschools.Thephysicalsizeofaschool
allowsyoutodetectitevenwithreducedgain.
cFish(40logTVG)
Thisgainsettingprovideslargeramplicationclosetothebottom.Ithasbeen
designedtoprovidethebestechoesfromsinglesh.
dTargets(40logTVG)
Basically,thissettingusesthesameTVGamplicationasFish,butadditional
lteringandcompensationisimplemented.Onlyechoesdetectedand
interpretedassingleshareshown.Theechoesarecompensatedfortheir
physicalpositioninthebeam(beamcompensation).Thismeansthatshin
theouterregionofthebeamareadjustedtocorrectsizeeventhoughtheir
echoesareweaker.
NotethatthisTargets(40logTVG)settingisonlyfunctionalwithsplitbeam
transducers.
eTargetMix(40logTVG)
Basically,thissettingusesthesameTVGamplicationasFish,butadditional
beamcompensationisimplemented.Echoesdetectedandinterpretedassingle
shareadjustedtotheircorrectsizeaccordingtotheirphysicalpositionin
thebeam.
NotethatthisTargetMix(40logTVG)settingisonlyfunctionalwithsplitbeam
transducers.
fUser(VariableTVG)
ThissettingallowsyoutodeneyourownTVGsetting.
NotethatyoucanalsoselectTVGbymeansoftheTVGbuttonontheActivemenu.
2EchogramType
Usethiseldtoselectwhatkindofechogramyouwishtosee.
aSurface
Theechogramisrelatedtotheseasurface.Startdepth(upperechogram
boundary)andverticalrange(acrossechogram)aremanuallyselectedbythe
StartDepthandRangebuttonsontheMainmenu.
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