Raymarine AXIOM Series - RF Interference; Compass Safe Distance; GNSS (GPS) Location Requirements

–A
tleast1m(3.3ft)fromanyequipmenttransmittingorcablescarryingradiosignalse.g.VHF
radios,cablesandantennas.InthecaseofSSBradios,thedistanceshouldbeincreasedto2
m(6.6ft).
–Morethan2m(6.6ft)fromthepathofaradarbeam.Aradarbeamcannormallybeassumedto
spread20degreesaboveandbelowtheradiatingelement.
•Theproductissuppliedfromaseparatebatteryfromthatusedforenginestart.Thisisimportant
topreventerraticbehavioranddatalosswhichcanoccuriftheenginestartdoesnothavea
separatebattery.
•Raymarinespecifiedcablesareused.
•Cablesarenotcutorextended,unlessdoingsoisdetailedintheinstallationmanual.
Note:
Whereconstraintsontheinstallationpreventanyoftheaboverecommendations,alwaysensure
themaximumpossibleseparationbetweendifferentitemsofelectricalequipment,toprovidethe
bestconditionsforEMCperformancethroughouttheinstallation.
RFinterference
Certainthird-partye xternalelectricalequipmentcancauseRadioFrequency(RF)interferencewith
GNSS(GPS),AISorVHFdevices,iftheexternalequipmentisnotadequatelyinsulatedandemits
excessivelevelsofelectromagneticinterference(EMI).
SomecommonexamplesofsuchexternalequipmentincludeLEDlighting(e.g.:navigationlights,
searchlightsandfloodlights,interiorandexteriorlights)andterrestrialTVtuners.
Tominimizeinterferencefromsuchequipment:
•KeepitasfarawayfromGNSS(GPS),AISorVHFproductsandtheirantennasaspossible.
•Ensurethatanypowercablesforexternalequipmentarenotentangledwiththepowerordata
cablesforthesedevices.
•ConsiderfittingoneormorehighfrequencysuppressionferritestotheEMI-emittingdevice.The
ferrite(s)shouldberatedtobeeffectiveintherange100MHzto2.5GHz,andshouldbefitted
tothepowercableandanyothercablesexitingtheEMI-emittingdevice,ascloseaspossibleto
thepositionwherethecableexitsthedevice.
Compasssafedistance
Topreventpotentialinterferencewiththevessel'smagneticcompasses,ensureanadequate
distanceismaintainedfromtheproduct.
Whenchoosingasuitablelocationfortheproductyoushouldaimtomaintainthemaximumpossible
distancefromanycompasses.Typicallythisdistanceshouldbeatleast1m(3.3ft)inalldirections.
Howeverforsomesmallervesselsitmaynotbepossibletolocatetheproductthisfarawayfroma
compass.Inthissituation,whenchoosingtheinstallationlocationforyourproduct,ensurethatthe
compassisnotaffectedbytheproductwhenitisinapoweredstate.
GNSS(GPS)locationrequirements
Inadditiontogeneralguidelinesconcerningthelocationofmarineelectronics,thereareanumberof
environmentalfactorstoconsiderwheninstallingequipmentwithaninternalGNSSreceiver.
Mountinglocation
•AboveDecks(e.g.openair)mounting:Providesoptimalperformance.(Forequipmentwith
appropriatewaterproofrating.)
•BelowDecks(e.g.enclosedspace)mounting:Performancemaybelesseffectiveandmayrequire
anexternalantennaorreceivermountedabovedecks.
Installation25