Handbook

Axell Wireless Limited
Technical Literature
MWAA Primary F/O Head End Documentation
Primary Head End BDA 60-174303
Document Number 60-214802HBK Issue No. 1 Date 23/07/2009 Page 13 of 24
4) Ensure that the mobile facing antenna has at least 70dB isolation from the nearest mobile.
(This is usually easily achieved when using a leaky feeder.)
5) The equipment gain is set by setting the variable switched attenuators in each path (uplink and
downlink) refer to the photographs and layout drawings for the exact attenuator locations).
Note that the uplink (mobile to base) and downlink (base to mobile) path gains are set
independently. This allows the paths to have different gains if required to set the correct output
power levels.
6) It is recommended that the gains are set such that the Downlink channel output levels from the
equipment are typically +30dBm per channel
(Input level + Gain = Output level).
4.7 Antenna Isolation
A). First set up the antennas and measure the isolation between them
B). Install the equipment with gain set 10dB below the isolation figure obtained above