User Manual

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GuardianManual001‐5006‐000Rev0 23|Page
2.5.5 FEEDLINE
Thechoiceoffeedlineshouldbecarefullyconsidered.Poorqualitycoaxialcablesshouldbeavoided,astheywill
degradesystemperformanceforbothtransmissionandreception.Thecableshouldbekeptasshortaspossibleto
minimizesignalloss.SeeTable2.1foralistoffeedlinerecommendations.
Table2.1‐TransmissionLoss(per100Feet)
 FrequencyRange
CableType VHF UHF 900MHz
LMR‐400 1.5dB 2.7dB 3.9dB
1/2”Heliax 0.68dB 1.51dB 2.09dB
7/8”Heliax 0.37dB 0.83dB 1.18dB
15/8”Heliax 0.22dB 0.51dB 0.69dB
Outsidecableconnectionsshouldhaveaweatherkitappliedtoeachconnectiontopreventmoisture.Feedline
connectionsshouldberoutinelyinspectedtominimizesignallossthroughtheconnection.A3dBlossinsignal
strengthduetocablelossand/orbadconnectionsrepresentsa50%reductioninsignalstrength.
2.5.6 RFEXPOSURECOMPLIANCEREQUIREMENTS
TheGuardianradioisintendedforuseintheIndustrialMonitoringandControlandSCADAmarkets.TheGuardian
unitmustbeprofessionallyinstalledandmustensureaminimumseparationdistancelistedinthetablebelow
betweentheradiatingstructureandanyperson.Anantennamountedonapoleortoweris
thetypicalinstallation
andinrareinstances,a1/2‐wavewhipantennaisused.
Table2.2–RFExposureComplianceMinimumSafe ty Distances
Antenna Gain
5 dBi 10 dBi 15 dBi
Min Safety Distance
(VHF @ max power)
123cm 218.8cm 389cm
Min Safety Distance
(UHF @ max power)
105.7cm 188cm 334.4cm
Min Safety Distance
(900 MHz @ max power)
63.8cm 115 cm 201.7 cm
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Note:ItistheresponsibilityoftheusertoguaranteecompliancewiththeFCCMPEregulationswhenoperating
thisdeviceinawayotherthandescribedabove.
TheGuardianradiousesalowpowerradiofrequencytransmitter.Theconcentratedenergyfromanantennamay
poseahealthhazard.Peopleshould
notbeinfrontoftheantennawhenthetransmitteris
operating.
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RF E