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Step 12: Align the Antenna
Antenna alignment is a process to physically align the antenna of the radio
receiver or transmitter for the best possible radio link between them.
The units have an audible antenna alignment tool that can be activated by
plugging in the serial dongle (supplied with every BSU) or by issuing the CLI
command for antenna alignment (see “Antenna Alignment Commands”). The
CLI command causes both audible and numerical feedback as the CLI shows
the running Signal-to-Noise Ratio (SNR) values twice a second.
The output from the beeper for antenna alignment consists of short beeps
with a variable interval. The interval changes with the SNR level to assist in
correctly aligning the antenna. An increase in signal level is indicated by a
shorter interval between beeps; a reduction in signal level results in beeps
longer apart.
To allow for precise antenna alignment, small changes in SNR result in large
changes in the beep period. The alignment process averages the SNR, which
is represented by an average length beep. When a higher SNR is received, the
beep period is made shorter, dependent upon the difference to the average.
A lower SNR results in a longer period between beeps. Aiming is complete if
moving in any direction results in a falling SNR value, which can be heard as
longer periods between beeps.
Antenna Alignment Commands
The following CLI commands are used to initiate and stop the antenna
alignment process. After the process has been successfully initiated, the CLI
displays the current-local/current-remote/average SNR values (in 500 ms
intervals) to indicate the link quality.
set aad enable local: Enables display of the local SNR (the SNR measured
by the receiver at the near end).
set aad enable remote: Enables display of the remote SNR (the SNR as
measured by the receiver at the far end).
set aad enable average: Enables display of the average SNR (the
average of local and remote SNR).
set aad disable: Disables Antenna Alignment Display (Ctrl-C also disables
AAD).
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