User's Manual

Doc. No.
Rev.
Date
1.00
2011-12-08
Damm Cellular Systems A/S, Denmark
TETRAFLEX
®
V7.5 MANUAL - Antenna System for BS41x
TetraFlex® 7.5 Manual 4-2
4.1 ANTENNA SYSTEM FOR BS41X
4.1.1 Introduction
This application note describes the recommended antenna configuration for the BS41x Tetra
Base station.
The BS41x Tetra BS includes either the TMA412 Tower Mounted Amplifier or the TMD412
Tower Mounted Amplifier and Duplexer. The use of the RX amplifier section in the TMA/TMD
is mandatory. It shall preferably be mounted in the top of the mast as close as possible to the
RX antennas or alternatively ground mounted at the BS rack.
The TMD412 in addition contains a Duplex Filter, which optionally can combine the TX and
one RX to run on same antenna.
Whenever possible it is however recommended to run with two separate RX antennas
and one TX antenna.
When using the TMD412 Tower Mounted Amplifier/Duplexer it is recommended not to
use the duplex filter option for more than 1 carrier, as the usage of the duplex filter
may increase disturbances in the receiver i.e. reduced sensitivity.
When using the duplex filter option, care shall be taken not to use TX frequencies
generating 5th order IM products on the used RX frequencies
The antenna system shall in addition contain one GPS antennas for each installed BSC.