Raymarine CYCLONE - Page 33

•Mountthescanneraboveheadheightoutofrangeofpersonnel,toavoidmechanicaldangerand
minimizeexposuretoelectromagneticradiation.
•Radaroperatesattheline-of-sight,soahighmountingpositiongivesbetterlongrange
performance.
•Surroundinglargeobjects,inthesamehorizontalplane,caninterferewiththeradarsignaland
causeblindareasorshadowsectorsandfalsetargetsontheradardisplay(seebelow).
Donotmounttheradarscannersohighthatitisaffectedbythepitchingandrollingofthevessel.
Shadowareasandfalseechoes
Mounttheradarscannerawayfromlargestructuresorequipment,suchasenginestacks,
searchlights,horns,ormasts.Theseobjectsmaycauseshadowareasandfalseechoes.For
example,ifyoumounttheradarscanneronamast,echoesfromothertargetsmaybereflectedfrom
themast.Wetsailsmayalsocauseshadowareas,soradarperformancemaybereducedinthe
rain.Itisparticularlyimportanttoavoidshadowareasnearthebow.Raisingorevenloweringthe
radarscannermayhelptoreducetheseeffects.
Inshadowareasbeyondtheobstructiontherewillbeareductionofthebeamintensity.Theremay
beablindsectorifthebeamintensityisnotsufficienttoobtainanechofromanobject.Thismay
occurevenatcloserange.Forthisreasontheangularwidthandrelativebearingofanyshadowarea
mustbedeterminedatinstallation.
Y oumaybeabletodetectshadowareasorfalseechoesonyourmultifunctiondisplay.Forexample,
seacluttercanbeusedasagoodindicatorofblindarcs.Darksectorsontheradardisplayindicate
possibleshadowedareas.Thisinformationshouldbepostednearthedisplayunitandoperators
mustbealertfortargetsintheseblindareas.
Access
Theradarscannershouldbeeasilyaccessibletoallowmaintenancetobecarriedoutsafely.
Sufficientclearancemustbeallowedtofullyopenthescannerunitformaintenanceandservice.
Mountingplatform
Theradarscannermustbemountedonarigidandstableplatform.Theplatformmustbecapableof
supportingthemassandinertiaoftheradarscannerunderseagoingconditions.Theplatformshould
nottwist(causingbearingerrors)orbesubjecttoexcessivevibrationorshock.
Theplatformmustbefree-draining,topreventthepoolingofwaterbeneaththeradarscanner.
Themountingsitemustbeclearofthefollowing:
•Ropes.
•Standingrigging.
•Runningrigging.
•Heat.
•Fumes.
•People.
Magneticcompass
Mounttheradarscanneratleast1mawayfromamagneticcompass.
Multipleradarscanners
Iftworadarscannersareinstalledatdifferentlocationsinadualradarsystem,careshouldbe
takentoallowforthedifferenceinpositionoftheradarswhenswitchingbetweenthetwoonyour
multifunctiondisplay.Thisisespeciallynoticeableatshortrangesonlargervessels.
Toreducepossibleinterferencebetweenradarscannersinadualradarsystem:
•Maximisethespacingbetweenthescanners.
•Ifpossible,locatethescannerssothattheyarealignedvertically,onedirectlyabovetheother,
withaminimumof2metresverticalseparation.
•Ifthescannerscan’tbealignedonedirectlyabovetheother,locateeachscannerthesame
distancefromthebowyourvessel.Interferenceismorelikelyifthescannersareinstalledonein
frontoftheother,evenwhenseparatedvertically.
Locationrequirements
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