10/12/13
TTU-12x0 Hardware & Installation Guide - PULS Wiki
https://puls.calamp.com/wiki/TTU-12x0_Hardware_%26_Installation_Guide
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Placement of Combination and Internal Antennas
When dealing with combination antennas, it is more important to considered GPS performance over Comm performance.
GPS signal strengths are much lower than those typically seen by cellular networks supported by the LMU. In order to
maximize the performance the LMU should have a clear view of the sky as possible. When installing the GPS antenna in a
vehicle, make sure that there are as few obstructions as possible close to the LMU that might block the view 360° to the
horizon. As with stand-alone GPS antennas, nothing should not block the combination antenna beyond 5° above the horizon
with the best location being near the center of the roof. For more covert installs, directly under the front or rear-windshields
are also acceptable.
Examples of Good (Green), OK(Yellow) and Poor(Red) combo antenna placements
Examples OK(Yellow) and Poor(Red) internal antenna placements
5.2.3 Access to the SIM (Subscriber Identity Module) Card
When used in a GSM or iDEN 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.
5.2.4 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.
5.2.5 Visibility of Diagnostic LEDs
