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Mobile Antenna Installation
Mobile Antenna Installation
Mobile Radio Operation and EME Exposure
Observe the following caution and electromagnetic energy exposure (EME) statements when
installing antennas:
C a u t i o n
NOTE: For low power mobile radios (7 W or less), there are no antenna type or installation
To assure optimal radio performance and that human exposure to radio frequency electromagnetic
energy is within the guidelines references in this document, transmit only when people outside the
vehicle are at least the minimum distance away from a properly installed, external mounted antenna.
Table 1
lists the minimum distance from several different ranges of rated radio power.
Rated Power of Vehicle-installed
Mobile Two-Way Radios
7 to 15 Watts
16 to 50 Watts
More than 50 Watts
Selecting an Antenna Site
1. Install the vehicle antenna external to the vehicle and in accordance with the requirements of
this documents.
2. The best mounting location for the antenna is at 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 groundling 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 interference.
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 braking 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 (30.48 cm) away from any
other antenna on the vehicle.
Use caution when installing antennas with mobile radio
equipment using transmitter powers in excess of 7 W.
restrictions.
Table 1 Rated Power and Distance
Minimum Distance from Transmitting Antenna
1 foot (30.5 cm)
2 feet (61 cm)
3 feet (91.5 cm)
3
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