406273/C
411
•Fishinggearnoise
AThetransducercanpickupnoisefrom
•Biologicaldisturbances
•Interference
•Cavitation
•Propellernoise
•Flownoise
•Acousticnoisefromotherhydroacousticsystems
BThetransducercableislong,andmaypickupelectricnoisefromgenerators,
pumps,coolingsystemsandotherelectricorelectromechanicaldevices.
CThepreampliersareverysensitive,andtheycaneasilypickupelectricalnoise
frominternalandexternalpowersupplies.Thepreampliersarealsovulnerablefor
analoguenoisecreatedbytheirownelectroniccircuitry.Digitalnoisecreatedby
theconverterandprocessingcircuitrycanalsocreateproblems.
DConverterstransformtheanalogueechoestodigitalformat.
ESignalprocessingcircuitrycancreatedigitalnoise.
Details
Selectchannel
Usethespinboxtoselectwhichchanneltostudy.Inthiscontext,thephrase
channelisusedasacommontermtoidentifythecombinationoftransceiver,
transducerandoperatingfrequency.
Noiseestimate
Foreverytransmission("ping")theES80measurestheecholevelsalongthe
chosenrange.Typically,thesemeasurementsaremadeeveryvemeters,evenfor
longranges.
Allechoesandnoiseinthewaterarerecorded.Thisincludesnoisegeneratedby
yourownvessel(electric,propellers,machineryetc),waterow,cavitationand
interference.Echoesfromshandotherspecies,aswellasfromthebottom,are
detectedandaddedtotheequations.
Functionsanddialogboxes
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