Fusion Wideband Installation Procedures
7-34
InterReach Fusion Wideband Installation, Operation, and Reference Manual
CONFIDENTIAL
D-620616-0-20 Rev F
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 down-
link intermodulation products may fall within the 850 Cellular uplink band. In addi-
tion, 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 following guidelines:
• In-band 800 iDEN intermodulation products < -90dBm
• Lower frequency 800 iDEN signals < –30dBm for Fusion
Given a typical DAS configuration (4 iDEN carriers, omni-directional antennas, line
of sight), these guidelines translate to an antenna spacing (d) 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 Cellular signals < –30dBm for Fusion
Given a typical DAS configuration (6 CDMA carriers for Fusion, omni-directional
antennas, line of sight), these guidelines translate to an antenna spacing (d) of 8-14
meters.
Connecting the Antenna to the RAU
Connect a passive multi-band antenna to the N connector on the RAU using coaxial
cable with the least amount of loss possible.
CAUTION:
Firmly hand-tighten the N connector – DO NOT
over-tighten the connector.
Connecting the CATV Cable
Considerations:
• Verify that the cable has been tested and the test results are recorded. This informa-
tion is required for the As-Built Document.
