Installation Guide

RADWIN5000InstallationGuideDQ0266610/A.01 B‐1
AppendixB:AboutAntennas
B.1ScopeofthisAppendix
Thisappendixprovidessomebasicinformationandconsiderationsregardingantennasand
whatyouneedtotakeintoaccountwhenconfiguringantennaparameters.
B.1AntennaIssues
ThechoiceofTxPower,antennagainandcableloss(betweentheradioandtheantenna)
determinestheEIRPandisaffecte dbysuchconsiderationsasradiolimitationsandregulatory
restrictions.
Beforeproceedingtoantennainstallationdetails,thefollowingbackgroundinformation
shouldbeconsidered:
B.2AboutSingleandDualAntennas
EachRADWINradioisactuallymadeoftworadiotransceivers(radios).Theradiosmakeuse
ofalgorithmsthatutilizebothSpatialMultiplexing(alsocalledMIMO)andDiversityresulting
inenhancedcapacity,rangeandlinkavailability.Thenumberofantennas(i.e.radios)usedis
determinedbyuserconfigurationandbyautomaticsystemdecisions,explained below.
B.2.1DualAntennasattheHBSandanSU
Whenusingdualantennasatbothsites(singlebipolarantennaortwomo‐unipolarantennas)
youcanchoosebetweenSpatialMultiplexingModeandDiversityMode.
SpatialMultiplexingMode
Underthismode,thesystemdoublesthelinkcapacity.Atthesametime,itkeepsthesame
rateandmodulationperradioaswasusedwithsingleantenna,thusincreasingcapacity,
rangeandavailability.
ForexamplewithadualantennaRADWIN5000cantransmitatmodulationof64QAMand
FECof5/6andgetanairrateof130Mbps,comparedto65Mbpswithsingleantenna.