User's Manual Part 2

Installing Fusion Wideband
Page 134 InterReach Fusion Wideband Installation, Operation, and Reference Manual
© 2013 TE Connectivity Ltd D-620616-0-20 Rev H • TECP-77-044 Issue 7 • May 2013
800/850MHzIsolationRequirements
WhendeployinganyRFsystem,givespecialattentiontopreventingreceiverblockingor
desensitizationbyout‐of‐bandtransmitters.Typically,sharpfiltersinthereceiverfront‐endwill
reducetheinterferingtransmitterstotolerablelevels.Inselectcases,theinterferersmayoccupy
afrequencybandthatisdirectlyadjacenttothereceivingbandandcannotbeadequatelyrejected
byfiltering.Theonlyrecourseinthesesituationsistoprovidesufficientisolationbyphysically
separatingtheinterferingtransmittersandreceivers.
iDENoccupiesspectrumatboth800
MHzand900MHz(Tx:851–869/Rx:806–824and
Tx:935–941/Rx:896–902),whiletheCellularAandBcarriersshareasingle850MHzblock
(Tx:869–894/Rx:824–849).Thecombinationofthesefrequencybands,800/900MHziDENand
850MHzCellular,resultinuplink(BTSreceive)bandsthatareadjacenttodownlink(BTS
transmit)bands.Figure38depictsthesenearlycontiguous
bands,witharrowsindicatingthe
interferingdownlinkandreceivinguplinkbands.
Figure38.
800/850 MHz Spectrum
Installationofanin‐buildingdistributedantennasystem(DAS)toprovidecoverageforboth
800/900MHziDENand850MHzCellularmustaccountforthesedownlink‐to‐uplink
interferenceissuesandprovideadequateisolation.
TEoffersthefollowingguidelinestowardachie
vingtheproperamountofisolationwhen
deployingTEFusionWidebandDASproducts.
Figure39.
Fusion Wideband 800/850/1900 MHz RAU Antenna Placement Guideline
824 849 851 869 894 896 - 902
800/iDEN Uplink 850 Cellular Uplink 800/iDEN Downlink 850 Cellular Downlink 900/iDEN Uplink
Band 1
800 MHz
Band 2/3
850/1900 MHz
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