User's Manual

EX7100 Technical Manual - Installation of Antenna and Equipment
©1999 Exicom Technologies (1996) Ltd 2-2 Issue 2 - February 2001
2.3 Mounting the Antenna
The antenna should be mounted high enough so that it is in "line-of-sight" with the
antenna at the other radio site (antenna height may have been determined during system
planning). The antenna should be placed at least 10 metres (VHF) or 3.5 metres (UHF)
from any metallic or conductive objects to avoid possible impaired operation of the
EX7100 link and fastened securely to protect against the effects of strong winds.
When mounting the antenna, ensure it is pointing in the correct direction with the correct
polarisation. Final adjustments to the antenna direction are made after both terminals are
installed. Refer to Section 2.11 "Final Antenna Alignment".
2.3.1 Antenna Polarisation
The site plan should include details of antenna polarisation. If it doesn't, use the following
information as a guide:
The antenna may be mounted with either vertical or horizontal polarisation. Figure 2.1
shows an antenna mounted with vertical polarisation (top) and horizontal polarisation
(bottom). In general, either polarisation can be used although each antenna must
have
identical polarisation.
Note: Vertical antenna polarisation is preferred if the radio link is to be used over a body
of water such as a lake or sea.
Figure 2.1: Antenna Polarisation