User Manual

2
Installation
20
CrossCheck CDPD Mobile Unit Manual
2.7
Choosing the GPS Antenna Mounting Location
Antenna location is critical for optimum GPS performance. When
choosing a location for the GPS antenna, consider these guidelines:
• The antenna has an unobstructed view of the sky.
• The antenna is safe from damage during normal vehicle
operation and maintenance.
• The antenna is not shielded from satellite signals by metal
objects or other impenetrable materials.
GPS signals can penetrate plastic, glass and tinted glass (except
metallized glass), fiberglass, and plexiglass materials as long as the
surface is relatively dry. GPS satellite signals do not penetrate metal or
dense wood.
Since GPS satellite signals can penetrate plastic, fiberglass, and glass,
the GPS antenna can also be installed on a dashboard under a sloped
windshield (if the windshield is not metallized) or under a plastic
fender or bumper. These alternative locations are likely to offer less
satellite coverage, since the metal components of the vehicle shield the
antenna from portions of the sky.
,
Caution –
Do not mount the GPS antenna under a metallized glass
windshield, such as those used in some vehicles for window de-
fogging or de-icing systems. However, the GPS antenna can be
mounted under a tinted-glass windshield.
Disclaimer - The instructions included in this section apply to the
GPS antennas sold by Trimble and may not apply to third-party
products. There are many other GPS antennas available on the
market which may or may not be compatible with the
CrossCheck CDPD, including combined GPS/CDPD cellular
antenna solutions which have not yet been tested and certified
by Trimble.