Simrad ST90 User Manual

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SelectingInactivemode..............................................................................................54
SettinguptheST90formaximumechorefreshrate...................................................55
Transmittingsinglepings............................................................................................56
Transmittingwithxed-timeintervals........................................................................57
Adjustingtheoutputpowertomatchvaryingconditions...........................................58
Selectingthebestoperatingfrequency........................................................................59
Controllingthegainandrangesettings................................................................................61
Adjustingthegain(echosensitivity)...........................................................................61
AdjustingtheTVG(TimeVariableGain)setting.......................................................63
Adjustingthesonarrange............................................................................................63
Adjustingtheintensityoftheechopresentations........................................................65
Changingthetilt..........................................................................................................65
Adjustingthebearing..................................................................................................67
Usingthemarkersandtrackingfeatures...............................................................................69
Startingapositiontrack...............................................................................................69
Startingatargettrack...................................................................................................70
Placinganewmarker..................................................................................................72
Deletingamarker........................................................................................................72
Measuringthesizeofaschoolrelativetothepurseseine..........................................73
Usingvisualaidsduringthepurseseinecatchphase..................................................74
Choosingtheshinggearinuse..................................................................................75
Changingtheshinggearpropertiestomatchyourownequipment..........................76
Improvingtherecognitionofshandschoolsusingreceiverlters....................................78
AboutthereceiverltersequenceintheST90...........................................................78
ReducingnoiseandreverberationwiththeAGC(AutomaticGainControl)
function...................................................................................................................79
ReducingpropellernoiseandinterferencewiththeNoiseFilter................................81
ReducingbottomandsurfacereverberationwiththeRCG(Reverberation
ControlledGain)function.......................................................................................82
ReducingnoiseandfalseechoeswiththePing-PingFilter........................................84
ReducingnoiseandreverberationwiththeAGC(AutomaticGainControl)
function...................................................................................................................85
Adjustingtheintensityoftheechopresentations........................................................86
Recordingandreplayingechodata.......................................................................................88
Deningtheleandfoldersettingsfordatarecording...............................................88
Recordingechodata....................................................................................................89
SelectingReplaymode................................................................................................90
Choosingwhichechodatale(s)toreplay.................................................................92
SimradST90

Simrad ST90 Specifications

General

Brand	Simrad
Model	ST90
Category	Sonar
Language	English