User's Manual

Installation
BreezeNET BU-DS.11/RB-DS.11 2-9 User’s Guide
2.6.5 Antenna Alignment
Low gain antennas do not require alignment due to their very wide radiation pattern.
High gain antennas have a narrow beamwidth necessitating an alignment procedure in
order to optimize the link.
Check antenna alignment by using the RSSI bar on the bottom panel of the
RB-DS.11 bottom panel.
⇒1⇒1 To perform antenna alignment:
1. Assemble antennas according to the assembly instructions included with the
antenna set.
2. Mount the antennas as high as possible.
3. Connect the coaxial cable to the BU-DS.11 at the main site.
4. Connect the coaxial cable to the RB-DS.11 at the remote site.
5. Power on both units.
6. Synchronize the units by aligning the antennas at the main and remote sites until
maximum signal quality is obtained. Check the signal quality RSSI bar on the
bottom panel of the RB-DS.11 bottom panel. If the received signal quality is lower
than expected for this antenna/range combination, change antenna height and verify
RF cables connections.
2.6.6 Antenna Diversity
In applications where no multipath propagation is expected, a single antenna is
sufficient for good performance levels. However, in cases where multipath
propagation exists BreezeCOM recommends using two antennas in order to utilize the
space diversity feature. 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 main and remote sites. 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.