User manual

Reference ILX34-AENWG ♦ Point I/O Platform
User Manual Wireless POINT I/O Adapter
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Page190of209 ProSoftTechnology,Inc.
 September19,2011
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6.5.7 Parabolic reflector antennas
Aparabolicreflectorantennaconsistsofaparabolicshapeddishandafeedantennalocatedin
frontofthedish.Powerisradiatedfromthefeedantennatowardthereflector.Duetothe
parabolicshape,thereflectorconcentratestheradiationintoanarrowpattern,resultingina
high‐gainbeam.
The
antennapatternisabeampointedawayfromtheconcavesideofthedish.Beamwidthand
antennagainvarywiththesizeofthereflectorandtheantennaconstruction.Typicalgainvalues
are15to30dBi.
Theantennapolaritydependsonthefeedantennapolarization.
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6.5.8 Adding bi-directional amplifiers
Abi‐directionalamplifiermaybeneededifanapplicationrequireslonglengthsofcoaxialcable
toreachtheantenna.Theamplifierisdesignedtoputmaximumtransmitpowerrightatthe
antennaandboostthereceivedsignalprimarilytoovercomethecableloss.Youcanonlyusean
amplifierfrom
ProSoftTechnologythatisspecificallyapprovedforusewiththeILX34‐AENWG
radio,andonlyincountrieswheretheamplifieroptionisapproved.
Thebi‐directionalamplifierisdesignedtooperatewithacoaxialcablelossbetweentheradio
andamplifierof6.5dBto20dB.Theoutputis
always1/2W,regardlessoftheinputlevel.With
lessthan6.5‐dBloss,theamplifiermaximuminputratingwillbeexceeded.Withmorethan20‐
dBcableloss,theamplifierwillnotturnon.
RefertoAmplifierchart(page190)toviewtheminimumandmaximumlengthsofvariouscable
types
requiredwhenyouuseabi‐directionalamp.
RefertoAmplifierDiagram(page191)foraninstallationdiagramoftheamplifieranditspower
supply.
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