User's Guide

PTP 250 User Guide Aligning antennas
phn-2182_003v004 (Oct 2011)
UNDER DEVELOPMENT
6-27
Antenna alignment tones
This is the first method that may be used to monitor receive signal level during antenna
alignment.
The ODU emits audible tones during installation to assist with alignment. The pitch of the
alignment tone is proportional to the received power of the wireless signals. Adjust the
alignment of the unit, in both azimuth and elevation, until the highest pitch tone is
achieved.
The tones and their meanings are described in Table 6-5. In each
of the states detailed in
the table, align the unit to give the highest pitch tone.
Table 6-5 Antenna alignment tones
State Name Tone
Description
State Description Pitch Indication
Free Channel
Search
Regular beep Executing band scan N/A
Scanning Slow broken
tone
Not demodulating the
wanted signal
Rx Power
Synchronized Fast broken tone Demodulating the
wanted signal
Rx Power
Registered Solid tone Both Master and Slave
units exchanging Radio
layer MAC
management messages
Rx Power
Alarm Fast broken dual
tone
A fatal error has
occurred.
The term ‘wanted signal’ refers to that of the peer unit being installed.
If, when in the Synchronized or Registered state, the tone varies wildly, there may be
interference or a fast fading link. Installing in this situation may not give a reliable link.
Investigate the cause of the problem.