Installation Manual

Tsunami Multipoint Version 1.3 Installation Guide
SU Antenna Characteristics
Polarization: LHCP
Beamwidth (Azimuth/Elevation): 10-degree
Figure 5. SU Antenna Pattern
Even when other licensees are not an issue, if you are using a network deployment using the “cell”
approach, all these considerations are still important for reducing interference between your own
adjacent installations. Antennas are tuned to operate on a specific group of frequencies.
Antenna Polarization
The Tsunami Multipoint system uses left-hand circular polarization. As a result, the signal is
successfully received regardless of the orientation of the antenna. Circular polarization also provides
protection against multi-path degradation of the signal quality.
Towers
When planning antenna placement, it might be necessary to build a free-standing tower for the antenna.
Regulations and limitations define the height and location of these towers with respect to airports,
runways, and airplane approach paths. These regulations are controlled by the FAA. In some
circumstances, the tower installations must be approved by the FAA, registered with the FCC, or both.
To ensure compliance, review the current FCC regulations regarding antenna structures. These
regulations (along with examples) are on the FCC web site at http://wireless.fcc.gov/antenna/
.
Chapter 1. Site Planning 13
CPN 63179 Issue Date: 01/24/03