Installation Manual

Tsunami MP.11a Antenna Installation Guide
The following figure shows some typical examples of obstacles that you must avoid for the directional
antenna to operate effectively:
▪ Neighboring buildings
▪ Trees or other obstructions
▪ Power lines
To allow optimal performance you must ensure that the type and placement of the antennas leave sufficient
clearance of the Fresnel Zone at the maximum width of the bulge, which is typically at the mid-point between
the antennas.
Figure 4. Potential Obstacles for a Directional Antenna
To minimize the influence of obstacles, signal interference, or reflections, note the following guidelines:
▪ Mount the antenna as high as possible above the “ground” to allow maximum clearance:
º In open areas, “ground” is the actual surface of the earth.
º In dense urban areas, “ground” is to be interpreted as the height of the highest obstacle in the
signal path between the two antenna sites.
▪ Avoid trees in the signal path to avoid signal absorption due to seasonal changes (leaves or ice).
▪ Install the antenna at least 2 m (6 ft) away from all other antennas.
Other situations, in which reflections of the radio signal may cause interference, are environments where
large reflecting surfaces exist in parallel or partly perpendicular to the antenna beam.
Chapter 1. Preparing for Installation 13
CPN 65756 Issue Date: 01 August 2003