User's Manual Part 1

Tsunami Multipoint Version 1.3 Installation Guide
Installing the GPS Antenna
If you do not plan to install multiple BSU in the same geographical area skip this section
If you plan to install multiple BSUs in the same geographical area (for example, one BSU might interfere
with another), you must install the supplied GPS antenna (a small metal plate with a black 2"x 2"
antenna and thin cable) on each BSU. Each BSU uses a global positioning system (GPS) to synchronize
its clock with other BSUs. You also must set each BSU to Multi Sector mode (see “Configuring the
System for Multi-Sector Mode” on page 29).
Mounting the GPS Antenna
To install the GPS antenna:
1. Position the GPS antenna in a location where the antenna plate is parallel to the earth/horizon and
the black antenna bump-up can be attached to the BSU (as shown in the following figure). The GPS
antenna should be exposed to as much of the sky as possible so it can acquire at least four GPS
satellites to extract timing signals for the BSU transmission synchronization.
Figure 15. GPS Antenna Mounted on BSU
2. Insert the band clamp through the slots in the GPS antenna-unit mounting bracket and around the
mounting pole. Tighten the clamp around the mounting pole and then tighten the screw in the clamp
to secure the GPS antenna mounting bracket to the mounting pole.
3. Attach the GPS antenna to the GPS antenna mounting bracket using the #10-32x3/8 SEM screws
(the screws with attached washers).
Chapter 2. Pre-Installation Tasks 24
CPN 63179 Issue Date: 01/24/03