Chapter 6: Configuration and alignment
Aligning antennas
Page 6-121
ODU installation tones
This is the first of two methods 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.
Note
When using ODU installation tones to align connectorized antennas, it may not be
possible to hear the tones. To overcome this problem, either use an assistant, or use a
stethoscope to give a longer reach.
The tones and their meanings are described in
. In each of the states detailed in the
table, align the unit to give the highest pitch tone. The term “wanted signal” refers to that of
the peer unit being installed.
Table 191 ODU installation 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
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.