PTP 800 Series User Guide
Task 12: Aligning ant ennas
phn- 2513_004v000 ( Oct 2012)
6- 99
Prerequisites for alignment
Before starting alignment, confirm the following:
•
The antennas, cables and CMUs have been installed at both ends of the link.
•
A link planning report is available (for example, from LINKPlanner). It should include
predicted RSSI voltage ranges (or received signal levels) and bearings for both ends of
the link. If the report specifies predicted receive signal levels (dBm) but not voltages,
then convert dBm to volts using the formula or graph in
on page
•
Two voltmeters with BNC connectors are available.
•
No personnel are in front of the antennas.
Aligning protected antennas
For a 1+1 Hot Standby link with two antennas at each end of the link, align each of the
following three pairs by following
on page
1
Align the ‘Tx Hi’ primary antenna to the ‘Tx Lo’ primary antenna. Do not make
any further adjustments to the two primary antennas.
2
Align the ‘Tx Hi’ secondary antenna to the (now fixed) ‘Tx Lo’ primary antenna.
3
Align the ‘Tx Lo’ secondary antenna to the (now fixed) ‘Tx Hi’ primary antenna.
Step 3 can be performed before step 2, if preferred.
Aligning dual-polar antennas
Perform alignment with either the Horizontal units muted or the Vertical units muted.
Take RSSI readings on the unmated units. After alignment, check that the difference in
receive power is within tolerance specified in the link planning report.
For more information, refer to the antenna manufacturer’s instructions.
Summary of Contents for PTP 800 Series
Page 1: ...Cambium PTP 800 Series User Guide System Release 800 05 02 ...
Page 40: ...Licensing requirements About This User Guide 10 phn 2513_004v000 Oct 2012 ...
Page 232: ...Limit of liability Chapter 3 Legal information 3 22 phn 2513_004v000 Oct 2012 ...
Page 322: ...Radiation hazard assessm ent Chapter 4 Reference information 4 90 phn 2513_004v000 Oct 2012 ...
Page 428: ...Replacing IRFU components Chapter 5 Installation 5 106 phn 2513_004v000 Oct 2012 ...
Page 630: ...Using recovery mode Chapter 7 Operation 7 78 phn 2513_004v000 Oct 2012 ...