User's Guide

12 HotPort 5020 User Guide
Ch. Center
Freq.
Distance
Determination
Registration Channel
Avoidance
TDWR
Restrictions
52 5260 Yes If > 35 km Yes No
56 5280 Yes If > 35 km Yes No
60 5300 Yes If > 35 km Yes No
64 5320 Yes If > 35 km Yes No
100 5500 Yes If > 35 km Yes No
104 5520 Yes If > 35 km Yes No
108 5540 Yes If > 35 km Yes No
112 5560 Yes If > 35 km Yes No
116 5580 Yes If > 35 km Yes Yes
120 5600 Banned
124 5620 Banned
128 5640 Banned
132 5660 Yes If > 35 km Yes Yes
136 5680 Yes If > 35 km Yes No
140 5700 Yes If > 35 km Yes No
table 1.4 dFs cHannels
Thistableshowschannelsdefinedas
DFS.Theyarecolor-codedbasedon
theapplicableruleset.
REGISTRATION
A voluntary WISPA-sponsored database has been developed that allows
registrationof devices within 35km of anyTDWRlocation(see http://
www.spectrumbridge.com/udia/home.aspx).Thisdatabaseisusedbygov-
ernmentagenciestoexpediteresolutionofanyinterferencewithTDWRs.
CHANNEL AVOIDANCE
Whenaradar signatureisdetected onachannel, transmittersmust stop
usingthatchannel.TheChannelSelectioncontrolletsyouconfigurethe
channelstowhichthesystemcanswitch,andthechannelswhichmustbe
avoided(blacklisted).
TDWR-Restricted Additional Requirements
TerminalDopplerWeatherRadarsystemsoperateinthe5600MHzband,
andmustbekeptfreeofinterferencefromallothertypesofequipment.For
thisreason,theFCChasremovedchannels120,124,and128(5600-5640)
from service, and placed additional restrictions on channels 116 (5580
MHz)and132(5660MHz).
Ifyouarewithin35kmofaTDWR,youmaynotoperateonanychannel
thatiswithin30MHzofthelistedTDWRfrequency.Insomeinstancesit
ispossiblethatadevicemaybewithin35kmofmultipleTDWRs.Inthis
casethedevicemustensurethatitavoidsoperationwithin30MHzforeach
oftheTDWRs.
Thisrequirementappliesevenifthemasterisoutsidethe35kmradiusbut
communicateswithoutdoorclientswhichmaybewithinthe35kmradius
oftheTDWRs.
Therequirementforensuring30MHzfrequencyseparationisbasedonthe
bestinformationavailabletodate.Ifinterferenceisnoteliminated,adis-
tancelimitationbasedonline-of-sightfromTDWRwillneedtobeused.In
addition,deviceswithbandwidthsgreaterthan20MHzmayrequiregreater
frequencyseparation.