User's Manual

Basic Installation
BreezeACCESS MMDS Series 5 SU-I-D Installation Manual
2.4.3 Antenna Diversity
In applications where no multipath propagation is expected, a single antenna is
sufficient to ensure good performance levels. However, in cases where multipath
propagation exists, BreezeCOM recommends that two antennas be used. This
takes advantage of space diversity capabilities. By using two antennas per unit,
the system can select the best antenna on a per-packet basis (every several
milliseconds).
Multipath propagation is to be expected when there are potential reflectors
between the Access Unit and Subscriber Units. These reflectors may be buildings
or moving objects such as airplanes and motor vehicles. If this is the case, the
radio signal does not travel in a straight line, but is reflected or deflected off of
the object, creating multiple propagation paths.
When installing a single antenna, modify the transmit diversity option to either
antenna 1 or antenna 2, according to the antenna being used.
2.4.4 Antenna Polarization
Antenna polarization must be the same at either end of the link. In most
applications, the preferred orientation is vertical polarization. Above-ground
propagation of the signal is better when it is polarized vertically. To verify
antenna polarization, refer to the assembly instructions supplied with the antenna
set. For screw-on and detached omni antennas, make sure that the antennas are
extended upward vertically in relation to the floor to achieve vertical
polarization.
2.4.5 Antenna Seal
When using outdoor antennas, you must seal the antenna connectors against rain.
Otherwise the antennas are not suitable for use in outdoor installations.
2.4.6 Lightning Protection
Lightning protection is designed to protect people, property and equipment by
providing a path to ground for the lightning’s energy. The lightning arrestor
diverts the strike energy to ground through a deliberate and controlled path
instead of allowing it to choose a random path. Lightning protection for a