Raymarine A series User Manual

30.7Sonarcrosstalkinterference
Thereare2typesofpotentialsonarcrosstalk
interferenceinaRaymarinesonarsystem:
1.SideVisionsonarcrosstalkinterference
2.Multiplesonarcrosstalkinterference
Thetypesofcrosstalkinterferencethatyou
mayexperienceinyoursystemdependonthe
combinationandtypeofsonarequipmentinstalled,
andthewayinwhichtheequipmenthasbeen
installed.
SideVisionsonarcrosstalk
interference
Multiplesonarcrosstalk
interference
Duetothehighsensitivity
ofSideVisiontransducers,
youmayexperiencesome
minorcrosstalkinterference
betweentheleftandright
receivingchannelsinareas
ofstrongtargetreturns.
Examplesofstrongtarget
returnsincludesolidobjects
suchasunderwaterbridge
structure.Thisinterference
showsupintheFishnder
applicationassubtle
reectionsfromtheright
sonarimagedisplayedin
theleftsonarimage,orvice
versa.
Whenusingmultiplesonar
modulesandtransducers
operatinginoverlapping
frequencyranges,youmay
experiencesomecrosstalk
interferencebetweenthe
ranges.Thisinterferenceis
displayedintheFishnder
applicationasvertical“rain
drops”throughoutthewater
column.Thesevertical“rain
drops”indicatethat2sonar
modulesareoperatingin
closefrequencyproximityto
oneanother.
SideVisionsonarcrosstalkinterference
Crosstalkinterferenceisexpectedbehaviorinahigh
sensitivitydevicesuchasaSideVisiontransducer,
andisnotindicativeofafaultwithyourtransduceror
sonarmodule.
Reducingmultiplesonarcrosstalk
interference
Crosstalkinterferenceinsystemswithmultiplesonar
modulesandtransducersistheresultofanumber
offactors,includinginstallation,operation,and
environment.
•Chooseanequipmentcombinationthat
minimizesoverlappingfrequencies.Wherever
possible,choosetousesonarmodulesand
transducersthatoperateindifferentfrequency
ranges(“Channels”),forexampleCP100and
CP300sonarmodulesandCPT-100andB744V
transducers.Thiswillhelptoensurethateach
componentisoperatinginadistinctrelative
frequencyrange–forexample,a“high”frequency
rangefortheCP100anda“low”frequencyrange
fortheCP300.
•Onlyusethesonarchannelsthatyoureally
need.Althoughitispossibletorunmultiplesonar
modulessimultaneouslyinaRaymarinesystem,it
maynotalwaysbenecessarytodoso.Ifyouare
inascenariothatrequiresonlyonesonarmodule
tobeactiveatatime,disableanyothersonar
modulesbychangingtheFishnderapplication
panetoasingleonewhichonlydisplaystheoutput
fromonesonarmodule.Alternatively,disablethe
pingforanyunusedsonarmodulesbyselecting
MENU>Channel>Ping>OFFintheFishnder
application.
•Identifythesonarmoduleandtransducerthat
iscausingtheinterference.Todothis,disable
thepingorremovethepowerforoneofthesonar
modulesinyoursystem.Iftheinterferenceinthe
Fishnderapplicationdisappearsimmediately,
younowknowwhichdeviceiscausingthe
interference.Iftheinterferencedoesn’tdisappear,
repeattheexerciseagainwiththeothersonar
module(s)inyoursystem,oneatatime.Onceyou
knowwhichdeviceiscausingtheinterference,
proceedwiththefollowingmethodstoreducethe
interferencefromtherelevantdevice.
•AdjusttheInterferenceRejectionFilter.The
defaultsettingforallRaymarineMFDsis“Auto”.
Changingthissettingto“High”mighthelpto
reduceinterference(MENU>Setup>Sounder
Setup>InterferenceRejection).Notethatthe
InterferenceRejectionFiltersettingisnotavailable
forallsonarmodules.
•Decreasethepoweroutputoftheinterfering
transducer.Adjustingthe“PowerMode”in
theSensitivitySettingsintheMFD’sFishnder
applicationcanhelptominimizethepresence
ofcrosstalkinterference(MENU>Sensitivity
Settings>PowerMode).NotethatthePower
Modesettingisnotavailableforalltransducers.
•EnsurethatyouhaveacommonRFground
pointforallelectricalequipmentonyour
vessel.OnvesselswithoutanRFgroundsystem,
ensureallproductdrainwires(whereavailable)
areconnecteddirectlytothenegativebattery
terminal.IneffectiveRFgroundingcancause
electricalinterferencewhichmayinturnresultin
sonarcrosstalkinterference.
•Increasethephysicaldistancebetweenyour
sonarmodules.Electricalinterferencemaybe
occurringbetweenacableononesonarmodule,
andacableonadifferentsonarmodule.Ensure
thatyoursonarmodulesarephysicallylocatedas
farawayfromeachotheraspossible.
•Increasethephysicaldistancebetweenyour
sonartransducers.Electricaland/oracoustic
interferencemaybeoccurringbetweenthe
differenttransducersinyoursystem.Ensurethat
yourtransducersarephysicallylocatedasfar
awayfromeachotheraspossible.
Note:Giventheeffortandpotentialdifculties
involvedinrelocatingsonarequipment,itshould
onlybeconsideredasalastresortwhenyoujudge
theinterferencetobeasignicantproblemwhich
cannotberesolvedusingthemethodsdescribed
above.
Troubleshooting
411

Raymarine A series Specifications

General

Display Type	LCD
Chartplotter	Yes
Display Size	7"
Display Resolution	800 x 480 pixels
GPS	Yes
Sonar	Yes
Cartography	Navionics, C-MAP
Radar Support	Yes
Waterproof Rating	IPX6