Konsberg cNODE MiniS - General Acoustic Considerations; Acoustic range factors; Vessel system impact; Transducer types and use

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Generalacoustic
considerations
Takethisinformationintoconsiderationwhendeployingthetransponders.
Acousticrange
Thedepthratingshouldnotbeconfusedwithacousticrange.Theacousticrangeis
dependentonmanyfactors,andsomeofthefactorsareoutsidecontroloftheuser.
Vesselsystem
Thedirectivityandcoverageareaforthevesselsystemisdifferent,dependingonwhich
systemyouareusing.Somesystemshavehighdirectivityandomnidirectionalcoverage,
whileothersystemshasreducedcoverageandlessdirectivity.Thetranspondershould
alwaysbewithinthecoverageconeofthevesselsystem.
Transducertype
Therearedifferenttypesoftransducersusedonthetransponders.Anomnidirectional
transducer,suchasTD180,coversalargearea,buthaslessacousticpowercomparedto
afocusedtransducer,suchasTD30V .Afocusedsignalgiveslessfootprint/coverage.
Thevesselshouldalwaysbewithinthesignalfootprintofthetransponder.
TXPower
Theabilitytodetectsignalsdependsonthesignalstrength.Thetransmissionpowercan
beadjusted,bothforthevesselsystemandforthetransponder.
Acousticnoise
Acousticnoiseispresentatallvessels.Atgivenconditions,thenoiselevelcanbe
excessive.Acousticnoiseiscausedbymainpropellersandthrusters,andinsome
instancesalsofrommachinery/pumpsonboard.Heavypropeller/thrusteruseoralso
wavescanalsogenerateairbubbles,whichcangetinfrontofthevesseltransducerand
blocktheacousticsignal.
Generalacousticconsiderations