User's Manual

Aligning antennas Chapter 6 Configuration and alignment
phn-2182_002v000
6-28
May 2011
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.
CAUTION
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.