June, 2000
6880907Z66-O
1-3
GTX Mobile Radio Installation Manual
Introduction
Mobile Antenna Installation
least the minimum distance away from a properly
installed, externally-mounted antenna.
Table 1-1 lists the minimum distance for several differ-
ent ranges of rated radio power.
Selecting an Antenna Site
1.
Install the vehicle antenna external to the
vehicle and in accordance with the require-
ments of the antenna manufacturer/supplier
2.
The best mounting location for the antenna is
in the center of a large, flat conductive surface.
In almost all vehicles, mounting the antenna
in the center of the roof will satisfy these
requirements. A good alternative location is in
the center of the trunk lid. If you use the trunk
lid, ensure that the trunk lid is grounded by
connecting grounding straps between the
trunk lid and the vehicle chassis.
3.
Ensure the antenna cable can be easily routed
to the radio. Ensure that the antenna cable is
routed separately and not in parallel to any
other vehicle wiring or mobile radio cable
wiring.
4.
Check the antenna location for any electrical
interference.
NOTE
Any two metal pieces rubbing against
each other (such as seat springs, shift
levers, trunk and hood lids, exhaust
pipes, etc.) in close proximity to the
antenna can cause severe receiver inter-
ference.
5.
If the vehicle is equipped with an electronic
anti-lock braking system (ABS), mount the
antenna at the center of the roof or trunk lid
and do not route the antenna cable near the
ABS Modulator Box. Mount the radio as far
away from the Modulator Box as physically
possible. This minimizes radio interference to
the modulator box from the radio.
6.
Make sure the mobile radio antenna is
installed at least one foot (30.48cm) away from
any other antenna on the vehicle.
Antenna Installation Procedure
1.
Mount the antenna according to the instruc-
tions provided with the antenna kit. Run the
coaxial cable to the radio mounting location.
Unless specified otherwise by the antenna
manufacturer/supplier, cut off the excess
cable and install the cable connector.
2.
Connect the antenna cable connector to the
radio antenna connector on the rear of the
radio. Refer to Figure 1-1.
Completing the Installation
1.
Mount the microphone clip to a convenient
spot near your radio.
2.
Your microphone has a telephone-type con-
nector at the end of its cord. Plug the micro-
phone into the control head connector.
3.
To complete your radio installation, plug the
power cable into the radio power connector.
Refer to Figure 1-1.
Control Station Antenna Installation
Mobile radio equipment is sometimes installed at a
fixed location and operated as a control station. In such
cases, the antenna installation must comply with the
following requirements in order to assure optimal per-
formance and make sure human exposure to radio fre-
quency electromagnetic energy is within the guidelines
set forth in the above standards:
• The antenna must be mounted outside the
building.
• Mount the antenna on a tower if at all possible.
• If the antenna is to be mounted on a building,
then it must be mounted on the roof of the top
floor.
• If the antenna is to be co-located with other
transmitting antennas, it is the responsibility of
the licensee to manage the site in accordance
with applicable regulatory requirements and
may require additional compliance actions such
as site survey measurements, signage, and site
access restrictions.
Table 1-1.
Rated Power and Distance
Rated Power of Vehicle-installed
Mobile Two-Way Radios
Minimum Distance from
Transmitting Antenna
7 to 15 W
1 Foot (30.5cm)
16 to 50 W
2 Feet (61cm)
More than 50 W
3 Feet (91.5cm)
