User Manual

5
MAXIMUM PERMISSIBLE EXPOSURE (MPE)
LIMITS
Do not transmit with this radio and antenna when persons are within the
MPE Radius of the antenna, unless such persons (such as the driver or radio
operator) are shielded from the antenna field by a grounded metallic barrier
(such as the user’s vehicle rooftop). The MPE Radius is the minimum
distance from the antenna axis that persons should maintain in order to
avoid RF exposure higher than the allowable MPE level set by the FCC for
Occupational/Controlled Exposure, as specified in 47 CFR 1.1310. See
“Determining MPE Radius” for your specific application.
WARNING
FAILURE TO OBSERVE THESE LIMITS MAY
ALLOW THOSE WITHIN THE MPE RADIUS TO
EXPERIENCE RF RADIATION ABSORPTION
WHICH EXCEEDS THE FCC MAXIMUM
PERMISSIBLE EXPOSURE (MPE) LIMIT FOR
OCCUPATIONAL/CONTROLLED EXPOSURE.
DETERMINING MPE RADIUS
The tables on the following page lists the MPE Radius for ranges of power
within which this radio is intended to operate (20, 30, or 40 Watts) and for
antennas having gains of 0-3 dBd (1/4 λ, quarter-wave monopole = 0 dBd).
Use the following procedure to determine the MPE radius for a specific
application:
1. Refer to the UHF table detailing the FCC limits for Occupational/
Controlled RF exposure.
2. Choose the row containing the power level going into the antenna.
3. Read the MPE Radius in the position intersecting the corresponding
power gain. (NOTE: For power gain ratings not appearing in the
tables, select the next highest listed number in each case.)
If the power level is not known (the level is set in personality
programming), assume the maximum of 40 watts. If the gain rating of
the antenna is not known, consult the antenna provider.