To Next Page

To Previous Page

457420/A

Controllingthegainandrangesettings

Topics

Adjustingthegain(echosensitivity),page61

AdjustingtheTVG(TimeVariableGain)setting,page63

Adjustingthesonarrange,page63

Adjustingtheintensityoftheechopresentations,page65

Changingthetilt,page65

Adjustingthebearing,page67

Adjustingthegain(echosensitivity)

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.

Theechostrength(A)changeswithtime.Theminimumlevelofdetection(B)isadjustedup

ordownwiththeGainfunction.IncreasingtheGainwithamorepositivenumberreduces

Operatingprocedures

Simrad ST90 User Manual

Other manuals for Simrad ST90