Simrad ST90 - Adjusting the Echo Sensitivity

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337568/A

4SelectRange.

5Makethenecessaryadjustment.

Select[+]or[-]tochoosetherequestedsetting.

or:

Placethecursoronthebutton.Pressandholdtheleft

mousebutton.Movethecursor

horizontallyoverthebutton.Releasethemousebuttonwhenrequestedvalueisshown.

or:

Selectthemiddleofthebuttontoopenit.Ifyouhaveakeyboardconnectedtothe

ST90,youcantypetherequestedvalue.

or:

Selectthemiddleofthebuttontoopenit.Selectavaluefromtheoptionsprovided.

6OpenthebuttonandselectApplytoallifyouwishtousethechosensettinginallthe

viewsinthecurrentpresentationmode.

Relatedtopics

Startingnormaloperation,page19

Adjustingtheechosensitivity

Someechoesareweakwhileothersarestronger.Tocompensateforthisitisoftennecessary

toadjustthesensitivityoftheST90.Thisadjustmentiscommonlyreferredtoasgain.

Context

Youcancomparethisgainsettingwiththevolumecontrolonyourcarradio.Whenthegain

isincreased,theechoeswillappearstronger.Weakechoeswillbeeasiertosee.However,

sinceyoualsoincreasetheacousticnoiseinthereception,theST90presentationswillalso

showthisnoise.Toomuchgainmaytherefore"distort"thepresentation.

Comparingthegainfunctionwiththevolumecontrolonyourcarradioisnotveryaccurate.

Infact,thegainintheST90isconstant.TheGainfunctionisusedtoadjustthesensitivity

Thisdonebycontrollingtheminimumlevelofdetection.Whenyouincreasethegainlevel

(morepositivenumber),youreducetheminimumlevel,andthusincreasethesensitivity.

SimradST90QuickStartGuide

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