10/12/13
LMU-3xx Hardware & Installation Guide - PULS Wiki
https://puls.calamp.com/wiki/LMU-3xx_Hardware_%26_Installation_Guide
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Accurate data gathering and simulation of how customers actually use your solution
Ongoing monitoring and maintenance of LMU equipment
Accidental or intentional alteration of the equipment or cable connections
The following sections cover some of the issues to consider when planning your LMU installation.
5.2.1 Size and Placement of LMU Unit
The dimensions of the LMU should be taken into account, particularly when installing in a vehicle:
Whether you intend to place the LMU under a seat or into a cavity behind the vehicle’s interior molded trim,
be sure the LMU will fit before drilling any holes or running cable
Be certain that the cables running to the LMU will not be bent or constricted. Damage to the
cables may impede the LMU’s performance.
Be certain that the installation point will not violate any of the LMU’s environmental specification
(temperature, moisture, etc…) as improper installation of the LMU may void the warranty.
See the LMU Environmental Specifications for the exact measurements and specifications of the LMU-3xx™.
Typical installations will place the LMU under the vehicle dash board, or in the trunk. Make sure you can get
access to the unit afterwards as under some circumstances it may be necessary to add additional wiring or
connections to the LMU.
5.2.2 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…)
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.
GPS Antenna Placement Guidelines
In order to maximize the performance of the LMU the GPS antenna should have a clear view of the sky.
