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MDS TransNET 900 I&O Guide
MDS 05-2708A01, Rev. B
8. The RF power output of all radios in a system should be set for the lowest
level necessary for reliable communications. This lessens the chance of
causing unnecessary interference to nearby systems.
3.4 Antenna & Feedline Selection
Antennas
The equipment can be used with a number of antennas. The exact style used
depends on the physical size and layout of a system. Contact your MDS
representative for specific recommendations on antenna types and hardware
sources.
In general, an omnidirectional antenna (
) is used at the
master station site in an MAS system. This provides equal coverage to all of
the remote sites.
NOTE:
Antenna polarization is important. If the wrong polarization is used, a signal re-
duction of 20 dB or more will result. Most systems using a gain-type omnidirec-
tional antenna at the master station employ vertical polarization of the signal;
therefore, the remote antenna(s) must also be vertically polarized (elements
oriented perpendicular to the horizon).
When required, horizontally polarized omnidirectional antennas are also avail-
able. Contact your MDS representative for details.
At remote sites and point-to-point systems, a directional Yagi antenna
(
), is generally recommended to minimize interference to and from
other users. Antennas are available from a number of manufacturers.
Figure 8.
Omnidirectional antenna
(mounted to mast)
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