Installation guide

Installing the Link Tsunami MP.11 Antenna Installation Guide

Aligning the Antenna

Antenna alignment is a process to physically align the antennas of both units to have the best possible radio link

established between them. The antenna alignment process usually is performed during installation and after major

repairs. The following methods are available to help you align the antenna:

• Audible Antenna Alignment

• Antenna Alignment using the CLI

• Antenna Alignment using Link Test

Alternatively, consult a professional Antenna Installation Service to optimize the antenna alignment.

Audible Antenna Alignment

MP.11-R models (954-R, 2454-R, 5054-R, 5054-R-LR, and 4954-R) have an audible antenna alignment tool that can be

activated by plugging in the supplied serial dongle (supplied with every Base Station) or by issuing the CLI command for

antenna alignment. The CLI command causes both audible and numerical feedback as the CLI shows the running SNR

values twice a second.

NOTE: Model 5054 has the SNR value output on the CLI but not the audible output (see Antenna Alignment using the

CLI).

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 further 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.

The first five steps are represented by a large change and all following steps are a small change. This acts as if a

magnifying glass is centered around the average SNR and the values next to the average are significantly different.

When the antenna is aimed, the beep can easily be heard if the SNR is rising (shorter period, higher frequency) or falling

(longer period). When the position of the antenna has been changed, the SNR averaging settles at the new value and the

beeping returns to the average length so the antenna can again be aimed towards rising SNR.

Aiming is complete if moving in any direction results in a falling SNR value, which can be heard as longer periods

between beeps.

NOTE: