User's Guide

Installation
BreezeNET BU-DS.11/RB-DS.11 2-9 User’s Guide
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.
When installing a single antenna, modify the transmit diversity option to either antenna 1 or antenna
2, according to the antenna being used (refer to page 3-7).
2.6.7 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.
2.6.8 Antenna Seal
When using outdoor antennas, you must seal unused antenna connectors against rain with the
antenna connector seals provided with the unit.
2.6.9 Cell Size
Cell size is determined by the maximum possible distance between the BU-DS.11 and the RB-
DS.11 unit, usually related to point-to-multipoint installations using external antennas. For open
outdoor areas with an unobstructed line of sight between the BU-DS.11 and the RB-DS.11 units, the
suggested maximum distance is up to 7KM (4.3 miles).