User's Manual

Planning and Installing Wireless LANs
BreezeNET PRO.11 Series 4-16 User’s Guide
If the received signal quality is lower than expected for this antenna/range
combination, change antenna height and verify RF cables connections.
4.2.3.4 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 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 antenna option to
either antenna 1 or antenna 2, according to the antenna being used (refer to
section 3.4.3). Note: Only antennas from Table 1 FCC Type Acceptance
Configurations can be used.
4.2.3.5 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.
4.2.4. 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.
4.2.5. Cell Size
Cell size is determined by the maximum possible distance between the
Access Point and the Station Adapter, usually related to point-to-multipoint
installations using external antennas. For open outdoor areas with an
unobstructed line of sight between the Access Point and the BreezeNET