User's Manual

Table Of Contents
Installing RAUs
InterReach Fusion Wideband Installation, Operation, and Reference Manual Page 135
D-620616-0-20 Rev K TECP-77-044 Issue 9 March 2015 © 2015 TE Connectivity
Figure 20. Fusion Wideband 800/850/1900 MHz RAU Antenna Placement Guideline
TE offers the following guidelines toward achieving the proper amount of isolation when
deploying TE Fusion Wideband DAS products.
800 MHz iDEN Downlink and 850 MHz Cellular Uplink
A 2 MHz frequency gap (851 – 849 MHz) separates the 800 iDEN downlink and 850 Cellular
uplink frequency bands. Because of this narrow spacing, 800 iDEN downlink intermodulation
products may fall within the 850 Cellular uplink band. In addition, 800 iDEN downlink signals
near the lower edge of the band at 851 MHz may cause the 850 Cellular uplink automatic level
control (ALC) circuitry in the RAU to engage and thereby reduce uplink gain.
To prevent either of these conditions, use the fo
llowing guidelines:
In-band 800 iDEN intermodulation products < -90dBm
Lower frequency 800 iDEN signals < –30dBm fo
r Fusion Wideband
Given a typical DAS configuration (four
iDEN carriers, omni-directional antennas, line of sight),
these guidelines translate to an antenna spacing (d1) of 6 – 9 meters.
850 MHz Cellular Downlink and 900 MHz iDEN Uplink
A 2 MHz frequency gap (896 – 894 MHz) separates the 850 Cellular downlink and 900 iDEN
uplink frequency bands. Because of this narrow spacing, 850 Cellular downlink intermodulation
products may fall within the 900 iDEN uplink band. In addition, 850 Cellular downlink signals
near the upper edge of the band at 894 MHz may cause the 900 iDEN uplink ALC to engage and
thereby reduce uplink gain.
To prevent either of these conditions, use the following guidelines:
In-band 850 Cellular intermodulation products < -90dBm
Upper frequency 850 Cellula
r signals < –30dBm for Fusion Wideband
Given a typical DAS configuration (six CDMA carriers for Fusion Wideband, omni-
directional
antennas, line of sight), these guidelines translate to an antenna spacing (d2) of 8-14 meters.
Spacing between RAUs FSN-8519-1 and FSN-809019-2 should be in a range of from
8 to 14
meters.
Band 1
800 MHz
Band 2/3
850/1900 MHz
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