Controlled Environment
Power density = 0.6455*frequency (in MHz)
0.5
W/m
2
with a Reference Period time of 6 Min
General Public/Uncontrolled Environment
Power density = 0.02619*frequency (in MHz)
0.6834
W/m
2
with a Reference Period time of 6 Min
Using the frequency (in the middle of the band of operation of this equipment) of 915MHz and the
highest antenna gain that this equipment is certified for use in a final installation, the minimum safe
distance was calculated. The MPE minimum distances are 18in (45cm) for the Controlled environment
and 47in (120cm) for the General Public/Uncontrolled environment.
TransCore Recommendation on MPE (Maximum Permissible Exposure)
The calculated power densities and MPE distance for each of the agencies respective to the
environment is shown below.
Occupational/Controlled Environment
Agency Power Density (mW/cm
2
)
MPE minimum distance
Time (min)
in cm
OSHA 10 7 18 6
FCC 3.05 13 32 6
IC 1.95 16 40 6
General Population/Public/Uncontrolled Environment
Agency Power Density (mW/cm
2
)
MPE minimum distance
Time (min)
In cm
OSHA 10 7 18 6
FCC 0.61 28 72 30
IC 0.28 42 106 6
With the equipment installed and running at the maximum transmit power of 1.6W (32dBm),
0dB transmit attenuation, using the highest gain antenna that the equipment is certified for, the
recommendation for each of the operation environments is as follows:
1 ) The antenna should be installed at least 42in (106cm) from the General Population/
Public i.e. Uncontrolled Environment.
2 ) Maintenance personnel (i.e. Occupational/Controlled Environment) must remain at
least 16in (40cm) from the antenna and limit their time in the environment to 6 minutes
when the system is operating.
TransCore Proprietary
vii
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