User's Manual

1/28/2015 LMU42x0Hardware&InstallationGuidePULSWiki
https://puls.calamp.com/wiki/LMU42x0_Hardware_%26_Installation_Guide 35/47
Forbestresults,itisstronglyrecommendedthattheLMUconnectionbeonitsowncircuit.Connectthepower
inputdirectlytothevehiclebatteryifpossibleandprotectthecircuitwithaninlinefuse.Ifyoumustconnect
throughthefusebox,usestandardcommercialwiringpracticestocreateapermanentinstallationratherthan
usingpressinfuseclipsorothertemporarymeasures.
DONOTconnectthepowercabletotheLMUatthistime.
5.3.3PlacetheGPSantenna.
TheGPSantennamusthaveaclearviewofthesky.MounttheGPSantennaonthevehicle’shighestpoint(for
example,theroofofacar).Makesurethattherearenoobstructionsclosetotheantennathatmightblockthe
view360°tothehorizon.Airhornslights,vents,etc..shouldnotblocktheantennabeyond5°abovethe
horizon.
KinksorknotsintheantennacablecanpreventtheGPSreceiverfromoperatingproperly.Whenlayingoutthe
antennacable,takecarethatthecableisnotsubjectedtocrushingorstrain.
Theideallocationistypicallynearthecenterofthevehicle’sroof.However,itisalsodesirabletolocatethe
cellularantennaasfarfromtheGPSantennaaspossible.
GPSAntennaLocation
5.3.4MounttheComm.Antenna.
WhenusingseparateCommandGPSantennas,itisbesttolocatetheComm.Antennaatleast3feetfromthe
GPSantenna.Ensurethatthecableisnotcrushedduringinstallationornormalvehicleoperation.
Again,theComm.Antennamustbelocatedatleast20cmawayfromvehiclepassengers,otherpersonnel,or
bystandersinordertocomplywithFCCradiofrequencyexposurelimits.