Simrad PI GEOMETRY - QUICK REFERENCE GUIDE REV B Manuel d'installation Page 182

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SimradSH90
Aboutbeamwidths
Anarrowbeamwillalwaysreachfurtherthanawidebeam.This
isbecausethetransmittedpowerofthesonarisconcentrated.
Nevertheless,youcaneasily“miss”aschoolofshifyoumake
thebeamtoonarrow.Iftherangeisreduced,itisthecommonto
useawiderbeam.
Figure40Beamwidths
ALarge
BNormal
CNarrow
ThenormalsettingontheSH90sonarisNormal.Thissettingis
basicallydesignedforlongerranges.
YoumayalsotrysettingAuto.Thissettingwillautomatically
adjustthebeamwidthdependingonthecurrentrange.
Formoreinformation,seetheparameterdialogdescription;
Beamonpage123.
AboutGain
Youcanadjustthegaininmanydifferentways,butthemost
importantisthesettingmadebytheGainbuttonsonthe
OperatingPanelandontheHorizontalandVerticalmenus.
Ifyouhavetoomuchgain,youwillseeasonarpicturewithtoo
manyechoes.Thisisbecausethelargeamplicationpresentsall
kindofnoiseandreverberationthatthesonarpicksup.Ifthe
gainissmallerthenoiseandreverberationwilldisappear,butifit
thegainistoosmalltheshechoesmaydisappearaswell.In
mostcasesyoushouldtrywithamediumvalue.
180
323775/B
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