Simrad ST90 - Page 36

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Theechostrength(A)changeswithtime.Theminimumlevelofdetection(B)isadjustedup
ordownwiththeGainfunction.IncreasingtheGainwithamorepositivenumberreduces
theminimumlevel,andthisincreasesthesensitivity.Onlyechoesovertheminimumlevel
areshownintheechogram(C).
DonotconfusethisGainsettingwiththeTVG(TimeVariedGain)setting.
Tip
Duringnormaloperatingconditionswerecommendthatyoukeepthegainbetween15and
30.Ifyouneedtoadjustthegain"fromscratch"disableAGC(AutomaticGainControl)and
RCG(ReverberationControlledGain)toseetheimmediateeffectofthegainadjustments.
Whileyouadjustthegainyoumaynditusefultohaveaknowntarget(forexamplean
island)asreference.
Procedure
1Clickintheviewyouwanttoactivate.
Theactiveviewisidentiedwithathickerborder.UnlessyouusetheApplytoall
function,allchangesyoumakewillonlybeappliedtothisview.
2Turntherelevantrotaryswitchtomaketheadjustment.
Tip
TheOperatingPanelisttedwiththreerotaryswitches.Theswitchesareidentied
withnumbers.Eachswitchcanbeassignedafunctionrelatedtorange,gainor
bearing.InvestigatethefunctionalityprovidedontheOperatingPanelpage.Thispage
islocatedintheInstallationdialogbox.
Optionally:
3ObservetheMainmenu.
ItsdefaultlocationisontherightsideoftheST90presentation.
SimradST90OperatorManual