User guide

Canopy System User Guide
pmp-0229 (Mar 2013)
174
Chapter 15: Avoiding Hazards
Use simple precautions to protect staff and equipment. Hazards include exposure to RF waves,
lightning strikes, and power surges. This section specifically recommends actions to abate these
hazards.
Exposure Separation Distances
To protect from overexposure to RF energy, install the radios so as to provide and maintain the
minimum separation distances shown in Table 43 away from all persons.
Table 43: Exposure separation distances
Module Type
Minimum Separation
Distance from Persons
FSK or OFDM module 20 cm (approx 8 in)
Module with Reflector Dish 1.5 m (approx 60 in or 5 ft)
Module with LENS 0.5 m (approx 20 in)
Antenna of connectorized 5.7-GHz AP 30 cm (approx 12 in)
Antenna of connectorized or integrated
900-MHz module
60 cm (24 in)
Indoor 900-MHz SM 10 cm (4 in)
At these and greater separation distances, the power density from the RF field is below generally
accepted limits for the general population.

NOTE:
These are conservative distances that include compliance margins. In the case
of the reflector, the distance is even more conservative because the equation
models the reflector as a point source and ignores its physical dimensions.
Section Appendix and Table 44 give details and discussion of the associated calculations.