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Antenna Location
Mobile Antenna Installation
Mobile Radio Operation and EME Exposure
Observe the following caution and electromagnetic
energy exposure (EME) statements when installing
antennas:
CAUTION
Use caution when installing antennas
with mobile radio equipment using
transmitter power in excess of 7 watts.
NOTE
For low-power mobile radios (7 watts or
less) there are no antenna type or instal-
lation restrictions.
To assure optimal radio performance and that human
exposure to radio frequency electromagnetic energy is
within the guidelines referenced in this document,
transmit only when people inside and outside the vehi-
cle are at least the minimum distance away from a
properly installed, externally-mounted antenna.
Table 2 lists the minimum distance for several different
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
Rated Power of Vehicle-installed
Mobile Two-Way Radios
7 to 15 Watts
16 to 50 Watts
More than 50 Watts
8
Table 2. Rated Power and Distance
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), and the
antenna will be trunk mounted, then install
the antenna on the side opposite to the brak-
ing modulator box. 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.
Minimum Distance from
Transmitting Antenna
1 Foot (30.5cm)
2 Feet (61cm)
3 Feet (91.5cm)
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