Raymarine A series - Page 282

1.SelectSensitivitySettings.
2.SelectAutoGainMode.
3.Selecttherequiredautogainmode.
Colorgain
Traditional,CHIRPandLegacysonarchannelsuse
differentcolorstodeterminethestrengthofanecho.
Youcanadjustthecolorgainmanuallybetween0%
and100%orsetittoautomatic.
20%ManualColor
Gain
AutoColorGain80%ManualColor
Gain
Colorgainsetsthelowerlimitforthestrongestecho
color.Allechoeswithasignalstrengthabovethis
valuearedisplayedinthestrongestcolor.Those
withaweakervaluearedividedequallybetweenthe
remainingcolors.
•Settingalowvalueproducesawidebandforthe
weakestcolor,butasmallsignalbandforthe
othercolors.
•Settingahighvaluegivesawidebandforthe
strongestcolor,butasmallsignalbandforthe
othercolors.
Adjustingthecolorgain
ToadjustthecolorgainonLegacyandTraditional
andCHIRPsonarchannelsfollowthestepsbelow.
FromtheFishnderapplication:
1.SelectMenu.
2.SelectSensitivitysettings.
3.SelectColorGain.
Thecolorgainsliderbarcontrolisdisplayed.
4.Adjustthecontroltotherequiredvalue.
5.SelectBacktoconrmsettingandcloseslider
bar,or
6.SelectAutotoenableautomaticcolorgain.
Contrast
DownVision
TM
andSideVision
TM
usemonochrome
shadingtodeterminethestrengthofechoes.You
canadjustthecontrastmanuallybetween0%and
100%orsetittoautomatic.
20%Manual
Contrast
AutoContrast80%Manual
Contrast
Contrastsetsthelowerlimitforthestrongestecho
shade.Allechoeswithasignalstrengthabovethis
valuearedisplayedinthelightestshade.Those
withaweakervaluearedividedequallybetweenthe
remainingshades.
•Settingalowvalueproducesawidebandforthe
darkestshade,butasmallsignalbandforthe
othershades.
•Settingahighvaluegivesawidebandforthe
lightestshade,butasmallsignalbandforthe
othershades.
Adjustingthecontrast
Toadjustthecontrastsettingfollowthestepsbelow.
FromtheFishnderapplication:
1.SelectMenu.
2.SelectSensitivitysettings.
3.SelectContrast.
TheContrastsliderbarcontrolisdisplayed.
4.Adjustthecontroltotherequiredvalue.
5.SelectBacktoconrmsettingandcloseslider
bar,or
6.SelectAutotoenableautomaticcontrast.
TimeVariedGain(TVG)
TheTimeVariedGain(TVG)settingcontrolsthe
amountofattenuationappliedthroughoutthewater
column,whichprovidesabalanceofshallowwater
returns(whereechoesarestrong)againstdeep
waterreturns(whereechoesareweak)sothat
targetsofthesamesizeproduceechoesofthe
similarsizeregardlessoftargetdepth.TheTVG
settingcanbemanuallysetfrom0%to100%orset
toautomatic.
D13057-1
0% 10% 20% 30% 40% 50% 60% 70% 80%
90% 100%
•AhigherTVGsettingwillproduceweakertargets/
lessclutteron-screen.
•AlowerTVGsettingwillproducestrongertargets/
moreclutteron-screen.
Note:TVGvaluesbetween0%and30%represent
topoutmodecontrol,valuesbetween31%and
100%representTVGcontrol.
31%TVG100%TVGAutoTVG
Note:TVGhasnoeffectinsimulatormode
howevertopoutmode(0%to30%)does.
Topoutmode
Topoutmodeisadigitallterthatiscombinedwith
theTVGcontrol.Thetopoutmodelterreduces
noiseandclutterfromthetopportionofthesonar
beam.
TopoutmodeisactivewhenTVGvaluesare
between0%and30%.TVGvaluesbetween31%
and100%representactualTVGcontrol.
282aSeries/cSeries/eSeries