TERION UM20-100111B, Руководство по установке, Страница: 15 / 78

required to be a minimum of 14" from the rear wall of the cab structure and as far
away from the exhaust stack as possible.
Note: Rear mount antenna installation should only be done when
a side mount is not feasible.
3.7 Selection of GPS Antenna Mount Location
Before selecting the GPS antenna location, the following items must be considered:
•
Preferred location . The preferred GPS antenna location is the top of the cab or roof
structure with the ability to look upward.
•
Flat surface mount . The GPS antenna should be mounted on a flat horizontal
surface with no metallic overhead obstacles.
•
Mount near FM/DHF antenna . If possible, mount the GPS antenna near the
FM/DHF antenna so that the antenna cables can share a common route to the ITU.
•
Air dam. The GPS antenna can be mounted under the roof-mounted air dam if the
air dam is constructed of either fiberglass or other non-metallic composite material.
•
Cable length. Upon determination of a suitable mounting location, verify that there
will be an adequate length of cable to reach the ITU. The GPS antenna is packaged
with a pre-configured length of cable and may not be modified.
3.8 Selection of Driver Terminal (DT) Location
The DT location must be far enough away from the driver so that the driver cannot attempt to
drive and use the DT at the same time; yet, it must remain within easy access. Proximity to
the driver, cable length from the DT to the ITU, and sturdiness of the desired DT cradle
attachment points are all important considerations.
Typical locations are on the passenger side dash, behind either seat, on a closet, or on a bunk
wall. On day cabs, locate the DT between seats or on the back wall. Select a location where
the DT will not be subjected to direct sunlight. Avoid placing the DT on top of the dash or in
rear seat windows. The customer should also be consulted when choosing a DT location.
3-3
Mobile Messaging System Installation Manual June 15, 2001
UM20-100111B Terion, Inc.