User's Manual

Aligning the Antennas
Manual Revision 1.0
3-5
Aligning the Antennas
An SNR bar display is located on the bottom panel of the RB-ODU. The
ten LEDs are used for indicating the quality of the received signal. The
higher the number of green LEDs indicating On, the higher the quality
of the received signal. This section describes how to align the antennas
using the SNR bar display.
NOTE
Antenna alignment using the SNR bar display is possible only after the RB is associated
with a BU. Both units must be operational and configured with the correct basic
parameters. If not, the unit will not be able to synchronize with the BU. As the SNR
measurement is performed on received frames, its results are meaningless unless the
RB is associated with a BU.
1. Align the antennas (integrated into the front side of the ODU unit, or
detached) by pointing each antenna it in the general direction of the
other unit.
2. Verify that the power indication of the units is On.
3. Verify that the WLNK orange LED of the RB-ODU is On, indicating
that the unit is associated with the BU. If the WLNK LED is Off,
check that the ESSID and Frequency parameters are correctly
configured. If the RB is still not associated with the BU, increase the
transmit power level to its maximum value. If the unit is still not
associated with the BU, improve the quality of the link by changing
the direction of the antennas or by placing the antennas at higher or
alternate locations.
4. Rotate the antenna of the RB-ODU until the maximum SNR reading
is achieved, where at least 1 green LED is on: If you encounter
prolonged difficulty in illuminating the minimum required number
of green LEDs, try to improve the reception quality by placing the
antenna at a higher point or in an alternate location.
5. Ensure that the front of the antenna is always facing the location of
the BU. However, in certain conditions, such as when the line of site
to the BU is hampered, better reception may be achieved using a
reflected signal. In this case, the antenna is not always directed
toward the BU.
To align the antennas: