Motorola PTP 500 User's Guide download pdf (Page 328)

Task 10: Aligning antennas Chapter 6 Configuration and alignment

phn-1115_006v000

6-46

Sep 2010

CAUTION

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.

To align the antennas, proceed as follows:

Procedure 6-16 Align antennas

At each end of the link, adjust the antenna to point at the other end of

the link. This should be done with the aid of a compass.

Without moving the master antenna, adjust the elevation and azimuth

of the slave antenna to achieve the highest receive signal level (using

one of the three recommended methods in Monitoring received signal

level on page 6-47).

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 three recommended methods).

Repeat steps 2 and 3 as necessary to fine-tune the alignment to find

the center of the beam.

When the antennas have been aligned on the center of the beam,

verify that 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 the DVM

method (see Method #2: digital voltmeter (DVM) on

ge 6-50) the

graphical installation method (see Method #3: graphical install on

pag

e 6-51) or by selecting menu option Statu

s and monitoring the

Receive Power attribute on the System Status page.

If after repeated attempts to align, the receive level still does not lie

within 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 (or connectorized antenna) mountings. To ensure that the action

of tightening does not alter antenna alignment, continue to monitor

received signal level.

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Motorola PTP 500 User's Guide Page 328

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