Raymarine A65 - Page 179

Frequencyadjustment(CHIRPsonarmodulein
non-CHIRPmode)
WhenusingaCHIRPsonarmoduleinCHIRPmode(LowChirp,
MedChirporHighChirp)thefrequencycannotbeadjusted.When
usingaCHIRPsonarmoduleinanon-Chirpmode(e.g.50kHz
or160kHz)thefrequencyatwhichthetransduceristransmitting
canbeadjusted.
WiththeCHIRPsonarmodulesettoaCHIRPmode(e.g.LowChirp
orHighChirp)theCHIRPsonarmodulewillsweepthetransducer’s
availablefrequencyrangeineachping.
WiththeCHIRPsonarmodulesettoanon-CHIRPmode(e.g.50
kHzor160kHz)theCHIRPsonarmodulecanadjustthefrequency
atwhichthetransduceristransmitting.Theadvantagesofbeing
abletoadjustthetransmitfrequencyinclude:
•Optimizationforparticularspeciesofshandwaterconditions.
•Avoidinginterferencefromothersonaroperatingnearby(atthe
samefrequency).
•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(CHIRPsonarmodulein
non-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nderapplication
titlebardisplaysthetransducerscenterfrequency.
Usingtheshnder
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