
SimradSH90
•PulseForm:Usethisfunctiontoselecttheformofthe
transmittedpulse.ThiscouldeitherbeFM(Frequency
modulation)withdifferentpulselengths,orCWwithdifferent
pulselengths.(►PulseFormonpage149)
•TXPower:Thisbuttoncontrolsthetransmissionpower.
(►TXPoweronpage173)
•Beam:Thisbuttonallowsyoutochooseverticalbeamwidth
inthehorizontalpresentation.(►Beamonpage123)
•TVG:TimeVariedGain.Thisfunctionwillautomatically
adjustthegaininthesonartocompensateforgeometric
spreadandabsorption.NotethattheTVGwillonlywork
withintherst1000meters.(►TVGonpage172)
•AGC:AutomaticGainControl.Thisfunctionwill
automaticallyreducethegainifyouexperiencereverberation
andnoise,orincreaseitiftheconditionspermitit.Usingthe
AGCwillensurebestpossiblesignalprocessing.(►AGC
onpage122)
•RCG:ReverberationControlledGain.Thisfunctionwill
automaticallyremoveunwantedreverberationfromthe
bottomorfromtheseasurface.Itmayhoweveralsoremove
scatteredsh.(►RCGonpage153)
•NoiseFilter:Thisltercanbeusedtominimizethe
interferencefromotheracousticsystems(sonarsandecho
sounders)onyourownandothervessels.Itwillalsosuppress
noisefromyourpropellers,andfromothersimilarnoise
sources.(►NoiseFilteronpage146)
•PPFilter:ThePing-to-Pinglterwillonlyshowyouthe
echoesiftheyarestillpresentafterseveralconsecutivepings
(2,4or8).Thisfunctionwillprovideyouwithamorestable
echopresentation,asspuriousechoeswillbesuppressed.
(►PPFilteronpage148)
94
323775/B
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