User's Manual Part 1

SystemDescription
38
DHR 800 Series High Power Repeater
TheDHR800offersahighpowersolutioninalightweight,convectioncooledIP65chassis.TheunitoffersBird's
featurerichfunctionssuchasself‐oscillationprotection,fastAGC,links ymmetryfunctionality,SNMPandremote
accessviaEthernetortheBirdRemoteGateway allinaruggedIP65chassis.
Figure 26 DHR 800 Series High Power Repeater
TheDHRrepeaterfamilyofferslinksymmetrysettings.Thisfunctionisusedtoautomaticallyadjusttheuplinkgain
basedonthedownlinksignal.Wheninstalledinmovingcoverageareassuchastrains,thefeaturepreventsthe
repeaterfromdesensitizingthedonorsitebyautomaticallycontrollinguplinklevels.
TheDHRre
peateralsoof
fersself‐oscillationprotection.Thisfunctionisusedtodetectproblemswithisolation
betweenthedonorandserviceantenna.Therepeaterwillinterveneandlowerthegaintoalevelequaltothe
isolationminusthestabilitymargin.ThesettingsareseparateforULandDL.
 On/Off
 Stabilitymargin:Valuesettingofhowmuchlowerthegainshouldbethanthecalculatedisol ation.Rangeof
0.0to20.0dBm.
 Recoverytime:Timethatshouldpassbeforetherepeaterresetthegaintothevaluespecifiedlevelin“RF
Config”(setgain).Rangeof30to86,400seconds.
 Recoverymargin:Setvalueofgainlevelabovethegainspecifiedin“RFConfig”(setgain)thatisusedwhen
therepeaterrecoversafterthe“RecoveryTime”.Rangeof0.0to20.0dBm.
Table 53 DHR800 Specifications
Gain 50‐88dBmin1dBsteps
NoiseFigure <5dB
Delay <6s
PowerSupply 85to264VAC
PowerConsumption <130W
Dimension(WxDxH) 30x13x70cm(11.8x5.1x27.6inches)
Weight <12kg(26.4lbs)
OperatingTe mp ‐25to55°C(13to131°F)
Casing IP65
Bandwidth 35MHz
Connectors N‐typeorDIN7/1 6 