Motorola M990 User Guide - Page 82

to mount the GPS antenna to the dashboard facing, In case of a vertical angle window

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If the vehicle incorporates a 'heat reflective' or 'comfort' windscreen, it is recommended that the antenna be installed elsewhere in the vehicle, e.g., the rear windshield. In order to maximize the GPS antenna performance, please obey the following guidelines: 1. Make sure the antenna location is well exposed to the open sky. 2. For best performance, the antenna should be attached to a metal ground plane. 3. Keep distance from any nearby metal object which may obstruct the transmission - windscreen coating (French cars), metal stickers, etc. 4. Keep distance of at least 30 cm (12 inches) from any other transmitting antenna. 5. In case of a vertical angle window, it is not recommended to mount the GPS antenna to the dashboard facing upwards. This may affect its exposure to the open sky. Note: In certain French car models (such as the Renault Megane and the Renault Kangoo), a radiation filter is fitted in the windscreen; In this case, install the GPS antenna on the vehicle metal roof. 74 - Installation Guide

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74 – Installation Guide
If the vehicle incorporates a 'heat reflective' or 'comfort'
windscreen, it is recommended that the antenna be installed
elsewhere in the vehicle, e.g., the rear windshield.
In order to maximize the GPS antenna performance, please
obey the following guidelines:
1. Make sure the antenna location is well exposed to the
open sky.
2. For best performance, the antenna should be attached to
a metal ground plane.
3. Keep distance from any nearby metal object which may
obstruct the transmission – windscreen coating (French
cars), metal stickers, etc.
4. Keep distance of at least 30 cm (12 inches) from any
other transmitting antenna.
5. In case of a vertical angle window, it is not recommended
to mount the GPS antenna to the dashboard facing
upwards. This may affect its exposure to the open sky.
Note:
In certain French car models (such as the Renault
Megane and the Renault Kangoo), a radiation filter is fitted in
the windscreen; In this case, install the GPS antenna on the
vehicle metal roof.