EH-5500FD Installation Manual
Page 29
2.10.2
Performing the Alignment
Note:
These instructions are for aligning a one-foot antenna. For instructions on aligning a
two-foot antenna, refer to the relevant section
To perform an alignment
1.
Verify that the ODU is in Alignment Mode.
Coarse Alignment (Azimuth Only)
2.
Loosen the unit mounting bolts (
) slightly to allow the ODU some freedom of
movement.
3.
Perform a coarse ODU alignment using a line-of-sight visual check with the
remote EtherHaul ODU. Lock the unit mounting bolts (
) using the 13mm open
wrench.
4.
Repeat steps 1 to 3 above on the remote ODU.
Fine Alignment
Note:
When aligning an antenna, the antenna in the remote node must remain completely
stationary. Perform Fine alignment first on the local antenna, and only afterwards on
the remote antenna.
The optimum alignment may require several adjustment iterations between the local
and remote antennas.
5.
Connect the DVM to the ODU by inserting both red and black probes into their
appropriate positions in the AUX port.
Throughout the alignment procedure, you must compare the actual receive
signal strength indication (RSSI) to the expected RSSI that was calculated during
network link budget preparation (refer to
on page 16).
Read the receive level (RSSI) using the DVM. The voltage reading will be
between 0 to 1V, indicating the RSSI in dBms. For example, a DVM reading of
0.45V is equivalent to -45 dBm.
6.
Align the fine Azimuth axis. Use the hexagonal wrench to adjust the Azimuth fine
adjustment screw (
). Be sure to sweep the complete range of the Azimuth in
order to determine the maximum received signal strength position.
When the optimum axis is achieved, tighten both Azimuth adjustment lock bolts
(
).
7.
Align the fine elevation axis. Use the hexagonal wrench to adjust the elevation
fine adjustment screw (
). Be sure to sweep the complete range of the
elevation in order to determine the maximum received signal strength position.
When the optimum axis is achieved, tighten both elevation adjustment lock
bolts (
).
