TransCore MPRX, System Manual

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MPRX
TransCore Proprietary vii
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
power density in W/m 2 . Thus, the maximum permissible exposure for general population/
uncontrolled exposure at 915MHz is 2.77 W/m 2 . The average time is 6 minutes. The maximum
permissible exposure (MPE) is the following:
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.