Installation guide

LMU-4200™ Hardware and Installation Guide

V1.0.9 November 13, 2010

- 13 - CalAmp Proprietary & Confidential

2.2.2 Placement of Antennas

There are effectively three options for placements of an antenna:

 Roof-mount (magnetic or thru-hole)

 Glass-mount

 Covert (e.g. under the seat, dash, etc…)

2.2.3 Comm Antenna Placement Guidelines

The Comm. Antenna must be located at least 20cm away from vehicle passengers, other

personnel, or bystanders in order to comply with FCC radio frequency exposure limits.

Typically, the Comm antenna used by the LMU for wireless service is a standard 3-dB gain

whip. It mounts with standard mounts (i.e. thru-hole, magnetic mount or peel and stick) and

requires a ground plane to work properly. If possible, it should be located at least 3 feet from

the GPS antenna. Ensure that the cable does not get crushed during installation.

Please note that the antennas provided by CalAmp combine both the GPS and Comm

portions.

2.2.4 GPS Antenna Placement Guidelines

In order to maximize the performance of the LMU the GPS antenna should have a clear

view of the sky. When installing the GPS antenna on a vehicle, make sure that there are no

obstructions close to the antenna that might block the view 360 to the horizon. Things like

air horns, lights, vents, etc… should not block the antenna beyond 5 above the horizon.

The best location is usually near the center of the roof; however it is also desirable to locate

the cellular antenna as far from the GPS antenna as is practical.