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R
660 Digital Weather Radar System
A28–1146–111
REV 3 6-1/(6-2 blank)
Maximum Permissible Exposure Level (MPEL)
6. Maximum Permissible Exposure
Level (MPEL)
Heating and radiation effects of weather radar can be hazardous to life.
Personnel should remain at a distance greater than R from the radiating
antenna in order to be outside of the envelope in which radiation
exposure levels equal or exceed 10 mW/cm
2
, the limit recommended
in FAA Advisory Circular AC No. 20–68B, August 8, 1980, Subject:
Recommended Radiation Safety Precautions for Ground Operation of
Airborne Weather Radar. The radius, R, to the maximum permissible
exposure level boundary is calculated for the radar system on the basis
of radiator diameter, rated peak–power output, and duty cycle. The
greater of the distances calculated for either the far–field or near–field
is based on the recommendations outlined in AC No. 20–68B. The
advisory circular is reproduced without Appendix 1 in Appendix A of this
manual.
The IEEE Standard for Safety Level with Respect to Human Exposure
to Radio Frequency Electronic Fields 3kHz to 300 GHz (IEEE
C95.1–1991), recommends an exposure level of no more than 6
mW/cm
2
.
Honeywell recommends that operators follow the 6 mW/cm
2
standard.
Figure 6–1 shows MPEL for both exposure levels.
MPEL Boundary
Figure 6–1