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PRO 11 SERIES WIRELESS ETHERNET
If the received signal quality is lower than expected for this antenna/range
combination, change antenna height and verify RF cable connections.
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, we recommend 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 few 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
Section 3.4.3
).
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.
5.3.4 A
NTENNA
S
EAL
When using outdoor antennas, you must seal the antenna connectors against rain.
Otherwise the antennas are not suitable for use in outdoor installations.
5.3.5 C
ELL
S
IZE
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 Pro 11 workstation, the suggested maximum
distance between a standard Access Point (LW0050A) and a workstation is 2000 ft.
(700 m).
Summary of Contents for LW0050A
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