Antenna & Feedline Selection; Antennas - Microwave Data Systems MDS TransNET 900 Installation & Operation Manual

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
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
(Figure 9), is generally recommended to minimize interference to and from
other users. Antennas are available from a number of manufacturers.
10 MDS TransNET 900 I&O Guide
(Figure 8
Figure 8.
Omnidirectional antenna
(mounted to mast)
and Figure 9) is used at the
MDS 05-2708A01, Rev. B