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Aligning antennas
NOTE
CAUTION
To align the antennas, proceed as follows:
At each end of the link, adjust the antenna to point at the other end of the
1
link. This should be done with the aid of a compass.
Without moving the master antenna, adjust the elevation and azimuth of the
2
slave antenna to achieve the highest receive signal level (using one of the
recommended methods in
3
Without moving the Slave antenna, adjust the elevation and azimuth of the
Master antenna to achieve the highest receive signal level (using one of the
recommended methods).
Repeat steps 2 and 3 as necessary to fine-tune the alignment to find the
4
center of the beam.
When the antennas have been aligned on the center of the beam, verify that
5
the receive level is within the predicted range (from the installation report).
If this is not the case, go back to step 2.
The current value of receive level can be verified by using
alignment
the Receive Power attribute on the System Status page.
If after repeated attempts to align, the receive level still does not lie within
6
the predicted range, this may be because the data provided to the
prediction tool (such as PTP LINKPlanner) is inaccurate. For example
estimates of path obstructions, antenna heights or site locations may be
inaccurate. Check this data and update the prediction as necessary.
Once the antennas have been aligned correctly, tighten the integrated ODU
7
(or connectorized antenna) mountings. To ensure that the action of
tightening does not alter antenna alignment, continue to monitor received
signal level.
6-26
To achieve best results, make small incremental changes to elevation and
azimuth.
The action of tightening the mounting bolts can alter antenna alignment.
This can be helpful when fine-tuning alignment, but it can also lead to
misalignment. To prevent misalignment, continue to monitor receive signal
level during final tightening of the bolts.
on page
6-29
Monitoring received signal level
or by selecting menu option Status and monitoring
Chapter 6 Configuration and alignment
on page 6-27).
Graphical
phn-2182_002v000
May 2011
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