Raymarine c97 - Page 191

Frequencyadjustment(CHIRPsonarmodule
innon-CHIRPmode)
WhenusingaCHIRPsonarmoduleinCHIRPmode(LowChirp,
MedChirporHighChirp)thefrequencycannotbeadjusted.
WhenusingaCHIRPsonarmoduleinanon-Chirpmode(e.g.
50kHzor160kHz)thefrequencyatwhichthetransduceris
transmittingcanbeadjusted.
WiththeCHIRPsonarmodulesettoaCHIRPmode(e.g.Low
ChirporHighChirp)theCHIRPsonarmodulewillsweepthe
transducer’savailablefrequencyrangeineachping.
WiththeCHIRPsonarmodulesettoanon-CHIRPmode
(e.g.50kHzor160kHz)theCHIRPsonarmodulecanadjust
thefrequencyatwhichthetransduceristransmitting.The
advantagesofbeingabletoadjustthetransmitfrequency
include:
•Optimizationforparticularspeciesofshandwaterconditions.
•Avoidinginterferencefromothersonaroperatingnearby(at
thesamefrequency).
•Useofwideornarrowbeamonaparticulartransducer.
Thegraphbelowdepictstheadjustment(selectionofaspecic)
frequencywhenusingaCHIRPsonarsetto160kHz.
CHIRPsonarmodulefrequency
120 130 140 150 160 170 180 190 200 210 220
Sen s itivity (d B)
Freq ue n cy
-50%
+50%
1
2
3
D12 57 5-1
1.Frequencyadjustmentrange.
2.Transducercharacteristics.
3.Operating(center)frequency.
Adjustingtheshnderfrequency(CHIRPsonarmodule
innon-CHIRPmode)
WhenconnectedtoaCHIRPsonarmodulesettoanon-CHIRP
modeyoucanmanuallyadjustthetransmitfrequency.
Fromtheshnderapplication:
1.selectMenu.
2.SelectFrequencysettings.
3.SelecteitherTuneFreq1orTuneFreq2asrequired.
TheFrequencyadjustsliderbarisdisplayed:
4.Adjusttheslidertotherequiredvalue.
5.SelectBacktoclosetheadjustfrequencysliderbar,or
6.SelectOktosettheadjustfrequencytoautomatic.
Note:Whenmanuallyadjustingthefrequencytheactual
frequencyofoperationisnotdisplayed,theshnder
applicationtitlebardisplaysthetransducerscenterfrequency.
Fishnderapplication
191