GE MDS Mercury Series Reference Manual page 160

152
Antennas
The radio equipment can be installed with a number of antennas. The
exact style used depends on the physical size and layout of a system.
Contact your factory representative for specific recommendations on
antenna types and hardware sources.
In general, an omnidirectional antenna
Points and mobile Remote stations. This provides equal signal coverage
in all directions.
NOTE: Antenna polarization is important. If the wrong polarization is
used, a signal reduction of 20 dB or more will result. Most
systems using a gain-type omnidirectional antenna at Access
Point stations employ vertical polarization of the signal; there-
fore, the Remote antenna(s) must also be vertically polarized
(elements oriented perpendicular to the horizon).
When required, horizontally polarized omnidirectional
antennas are also available. Contact your factory representa-
tive for details.
Figure 5-4. Typical Omnidirectional Antennas
At fixed Remote sites, a directional Yagi antenna
Page 153) minimizes interference to and from other users. Antennas are
available from a number of manufacturers.
Mercury Reference Manual
(Figure 5-4) is used at the Access
Invisible place holder
High-gain Type
Unity-gain Type
(Figure 5-5 on
05-4446A01, Rev. C