Specifications

Menusystem
8Beam
Thisparameterallowsyoutocontroltheverticalbeamwidthinthehorizontal
presentation.
9Frequency
Thisparameterisusedtocontrolthetransmitterandreceiveroperationalfrequency.
10TVG
ThisparameterallowsyoutochoosetheTimeV ariableGainsettingintheSH90.
ThisfunctionwillautomaticallyadjustthegainintheSH90tocompensatefor
geometricspreadingandabsorption.
11AGC
ThisparametercontrolstheAutomaticGainControl.Thisfunctionwill
automaticallyreducethegainifyouexperiencereverberationandnoise,orincrease
itiftheconditionspermitit.
12RCG
ThisparameterisusedtocontroltheReverberationControlledGain.Thisfunction
willautomaticallyremoveunwantedreverberationfromthebottomorfromthesea
surface.Itmayhoweveralsoremovescatteredshfromthepresentation.
13NoiseFilter
Thisparameterallowsyoutocontrolthebuilt-inlterdesignedtoremoveunwanted
acousticnoisefromtheSH90presentation.
Itwillreducetheinterferencefromotheracousticsystems(sonarsandecho
sounders)onyourownvesselandfromothervesselsinthevicinity.Itwillalso
suppressthenoisefromyourownandothervessels’propellers,andfromother
similarnoisesources.
14PPFilter
Thisparametercontrolstheping-pinglter,whichreducestheamountofunwanted
noiseandechoesonthescreen.Thelterwillonlyshowyoutheechoesiftheyare
stillpresentafterseveralconsecutivepings(2,4or8).Thisfunctionwillprovide
youwithamorestableechopresentation,asspuriousechoeswillbesuppressed.
15Status
TheStatusparameterdialogcontainsatransducerpositionindicator,aswellas
presentationofcurrenttime,date,latitude,longitude,headingandspeed.Someof
thebuttonsallowyoutoadjusttheseparameters.
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