Installation guide

LMU-4200™ Hardware and Installation Guide

V1.0.9 November 13, 2010

- 14 - CalAmp Proprietary & Confidential

7 Examples of good and poor GPS antenna placements

The received signal levels at the GPS antenna from the satellites are very low in power

(approximately -136 dBm), so any blockage of the antenna can affect the quality of the

location computed by the receiver. Kinks or tight knots in the antenna cable can also

prevent the GPS receiver from operating properly. When laying out the antenna cable, care

should be taken so that the cable is not subjected to crushing or strain.

2.2.5 Access to the SIM (Subscriber Identity Module) Card

When used in a GSM or HSPA network, each LMU uses a Subscriber Identity Module

(SIM) card, which should be inserted before you install the LMU for the first time. The SIM

card is attached to the main-board inside the housing of the LMU unit.

At some future time, you might need or want to replace the SIM card with a different one,

so try to install the LMU in such a way that the cover can be removed to make the SIM card

accessible.

2.2.6 Protection from Heat

It is best not to place the LMU unit in an unusually warm location such as directly near

heater vents, near hot engine components or in direct sunlight. The maximum temperature

that can be tolerated by the LMU is described in the LMU Environmental Specifications

section.

2.2.7 Visibility of Diagnostic LEDs

Status LED lights on the front of the LMU unit can provide valuable information about the

operation of the LMU. When feasible, attempt to install the LMU in such a way that these

lights can be seen with reasonable ease.