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3.9Generallocationrequirements
Whenselectingalocationfortheunititisimportant
toconsideranumberoffactors.
AntennamountingandEMEexposure
Ensurethattheantennaisconnectedtotheradio
beforetransmission.
RaymarinedeclaresaMaximumPermissible
Exposure(MPE)radiusof1.5metres(4.9ft)(per
OETBulletin65)forthissystem,assuming25watts
outputtoanomnidirectionalantennaof3dBigain
orless.
Forwatercraftwithsuitablestructures,theantenna
basemustbeatleast3.5metres(11.5ft)above
themaindecktomeettheMPEforpersonsupto
2metres(6.6ft)tall.Forwatercraftwithoutsuch
structures,theantennamustbemountedsothatits
baseisaminimumof1.5metres(4.9ft)vertically
fromheadsofallpersons.
Theantennamustbeisolatedfromthevessel’s
metalworkusinganinsulated(e.g.plastic)mounting
bracket.
Compasssafedistance
Topreventpotentialinterferencewiththevessel's
magneticcompasses,ensureanadequatedistance
ismaintainedfromtheproduct.
Whenchoosingasuitablelocationfortheproduct
youshouldaimtomaintainthemaximumpossible
distancefromanycompasses.Typicallythisdistance
shouldbeatleast1m(3ft)inalldirections.However
forsomesmallervesselsitmaynotbepossibleto
locatetheproductthisfarawayfromacompass.In
thissituation,whenchoosingtheinstallationlocation
foryourproduct,ensurethatthecompassisnot
affectedbytheproductwhenitisinapoweredstate.
GPSlocationrequirements
Inadditiontogeneralguidelinesconcerningthe
locationofmarineelectronics,thereareanumber
ofenvironmentalfactorstoconsiderwheninstalling
equipmentwithaninternalGPSantenna.
Mountinglocation
AboveDecksmounting:
ProvidesoptimalGPSperformance.(For
equipmentwithappropriatewaterproofrating.)
BelowDecksmounting:
GPSperformancemaybelesseffectiveandmay
requireanexternalGPSantennamountedabove
decks.
D115 37 -2
1
2
3
1
2
3
1.
ThislocationprovidesoptimalGPS
performance(abovedecks).
2.
Inthislocation,GPSperformancemaybeless
effective.
3.
ThislocationisNOTrecommendedforGPS
antenna.
Vesselconstruction
Theconstructionofyourvesselcanhaveanimpact
onGPSperformance.Forexample,theproximity
ofheavystructuresuchasastructuralbulkhead,
ortheinterioroflargervesselsmayresultina
reducedGPSsignal.Beforelocatingequipment
withaninternalGPSantennabelowdecks,seek
professionalassistanceandconsideruseofan
externalGPSantennamountedabovedecks.
Prevailingconditions
Theweatherandlocationofthevesselcanaffectthe
GPSperformance.Typicallycalmclearconditions
provideforamoreaccurateGPSx.Vesselsat
extremenortherlyorsoutherlylatitudesmayalso
receiveaweakerGPSsignal.GPSantennamounted
belowdeckswillbemoresusceptibletoperformance
issuesrelatedtotheprevailingconditions.
Ventilationrequirements
Toprovideadequateairow:
Ensurethatequipmentismountedina
compartmentofsuitablesize.
Ensurethatventilationholesarenotobstructed.
Ensureadequateseparationofequipment.
Mountingsurfacerequirements
Ensureunitsareadequatelysupportedonasecure
surface.DoNOTmountunitsorcutholesinplaces
whichmaydamagethestructureofthevessel.
Cableroutingrequirements
Ensuretheunitismountedinalocationwhichallows
properroutingandconnectionofcables:
Minimumcablebendradiusof100mm(3.94in)is
requiredunlessotherwisestated.
22
Ray50/Ray52/Ray60/Ray70
22


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