User guide

Task 12: Aligning antennas Chapter 6: Configuration and alignment
6-102
phn-2513_004v000 (Oct 2012)
Aligning one end
Align the antenna at one end of the link while keeping the antenna at the other end of the
link stationary.
To find the correct elevation and azimuth angles at one end, proceed as follows:
1
Perform a complete sweep of the elevation range of the antenna by adjusting
the elevation angle incrementally. The extent of the sweep depends upon
antenna gain. Measure RSSI voltage at each point in the sweep.
2
The resulting plot of voltage against elevation should be symmetrical. Record
the elevation angle that appears to be at the axis of symmetry, as this is likely to
be the correct angle for aligning with the other antenna (Figure 167).
Figure 167 shows the axis of symmetry occurring at a voltage ‘peak’.
However, it is possible for the axis of symmetry (and therefore the correct
elevation angle) to occur at a voltage ‘trough’ (Figure 168).
3
Set the elevation angle to the axis of symmetry, as identified in the plot.
4
Perform a complete sweep of the azimuth range of the antenna and record the
resulting plot of voltage against azimuth.
5
Set azimuth angle to the centre of the range over which the maximum RSSI
voltage is recorded.
Figure 167 Symmetrical relationship between voltage and alignment