Specifications

SimradSH90
Tip
Forscatteredsh,wesuggestthatyouusethe40logRsetting.Forsmallschools,try
30logR,forlargeschools,use20logR.Ifyouuse20logRthebottomwillalwaysbe
presentedwiththesameechostrength.
Ifyouwishtoexamineweakechoesveryclosetoyourvessel,youmaywishtouse
10logRor5logR,orturnofftheTVG.
KeepinmindthattheltersintheSH90areimplementedin“series”.TheTVG
compensationsaremadebeforetheAGC(AutomaticGainControl).Forthisreason,
yourTVGsettingwillalwayshaveaneffectontheAGC.
IfyoudisabletheTVGcompensation,maximumgainwillbeusedonallranges.
Relatedtopics
•WhatisTVG?onpage102
Procedure
1ClickeithertheHorizontalorVerticaltabtoopentherespectivemenu.
2ObservetheTVGbutton.
3Clickeithersideofthebuttontoleafthroughtheoptions,orthemiddleofthebutton
toopentheparameterdialog.
Adjustingthedisplaygain
Purpose
Thisfunctioncontrolsthe“amount”ofechothataredisplayed–thestrengthofthe
echopresentationonthedisplay.UsethiscontroltogetherwithGaintocontrolthe
SH90sensitivity.
Tip
Adjustthedisplaygainsothatyoucansethetargetwithouttoomuchnoiseand
reverberationonthescreen.Thisisamatterofindividualpreference.
Procedure
1ClicktheDisplaytabtoopenthemenu.
2ObservetheDisplayGainbutton.
3Clickeithersideofthebuttontoleafthroughtheoptions,orthemiddleofthebutton
toopentheparameterdialog.
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