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LMU-4200™ Hardware and Installation Guide
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.
V1.0.9
November 13, 2010
Copyright ©CalAmp DataCom Inc 2010
CalAmp Proprietary & Confidential
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