Installation Instructions

FIXED TERMINAL INSTALLATION HANDBOOK
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This document is the property of MATRA NORTEL COMMUNICATIONS and should not be copied or circulated without permission
IH – PS8433EAE01 09/2001
4.3 EQUIPMENT INSTALLATION PROCEDURES
4.3.1 Antenna (fixed radio terminal)
4.3.1.1 Recommendations for installing the fixed radio
terminal antenna
The terminal must be associated with a specific antenna for its frequency
band. The antenna should be installed in conformity with local climatic
standards.
If several antennas are installed on the same building, the antenna
location must be chosen according to the instructions detailed in Section
4.3.1.2.
Note: The transceiver is protected in the event of accidental switchover
to transmission without an antenna.
CAUTION: Whenever work has been carried out on the antenna
circuit, it is essential to check that the SWR (Standing
Wave Ratio) remains less than the value 1.5.
4.3.1.2 Installation of multiple antennas
When several fixed radio terminals are located on the same site, several
antennas must be installed on the same building.
On these multiple installation sites, precautions should be taken to avoid
radio links being subjected to interference.
Problems associated with the simultaneous operation of weakly
decoupled antennas, generally have three causes:
• intermodulation of two transmitters interfering with the reception of a
third transmitter,
antenna decoupling in excess of 18 dB preventing intermodulation,
The background noise emitted in the reception band is:
for G1 BERs (radio version A and version B) : – 125 dBm/Hz, i.e. –
86 dBm in one channel,