PTP 250 User Guide
Aligning antennas
phn-2510_002v000 (Mar 2012)
6-29
6
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.
7
Once the antennas have been aligned correctly,
t
ighten 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.
Aligning separate antennas for spatial diversity
If a connectorized ODU is installed at either site with two separate antennas for spatial
diversity, proceed as follows:
1
Connect the horizontal polarization antenna to the ODU, disconnect the vertical
polarization antenna.
2
Perform
Aligning antennas
on page
6-28
.
3
Connect the vertical polarization antenna to the ODU, disconnect the horizontal
polarization antenna.
4
Perform
Aligning antennas
on page
6-28
.
5
Re-connect the horizontal polarization antennas. The received signal level should
increase.
6
Weatherproof the antenna connections at the ‘H’ and ‘V’ interfaces of the ODUs,
as described in
Mounting and connecting antennas
on page
5-8
.
Monitoring received signal level
The goal of antenna alignment is to find the center of the main beam. This is done by
adjusting the antennas while monitoring the receive signal level. Choose one of two
methods for monitoring receive signal level:
x
Antenna alignment tones
on page
6-30
x
Graphical alignment
on page
6-31
Summary of Contents for PTP 250
Page 1: ...Cambium PTP 250 User Guide System Release 250 02 01 ...
Page 8: ...Safety and regulatory information VI phn 2510_002v000 Mar 2012 ...
Page 20: ...List of Tables xii phn 2510_002v000 Mar 2012 ...
Page 58: ...System management Chapter 1 Product description 1 30 phn 2510_002v000 Mar 2012 ...
Page 104: ...Limit of liability Chapter 3 Legal information 3 12 phn 2510_002v000 Mar 2012 ...
Page 122: ...Notifications Chapter 4 Reference information 4 18 phn 2510_002v000 Mar 2012 ...
Page 152: ...Installing the PoE power supply Chapter 5 Installation 5 30 phn 2510_002v000 Mar 2012 ...