Avoiding Hazards; Preventing Overexposure To Rf Energy; Calculations For Separation Distances And Power Compliance Margins; Table 3: Exposure Separation Distances - Motorola Canopy 300 Mbps Backhaul User Manual

2

AVOIDING HAZARDS

2.1

Preventing Overexposure to RF Energy

Caution! To protect from overexposure to RF energy, install Canopy radios so as to provide
and maintain the minimum separation distances from all persons shown in
When the system is operational, avoid standing directly in front of the antenna. Strong RF
fields are present when the transmitter is on. The Outdoor Unit (ODU) must not be deployed
in a location where it is possible for people to stand or walk inadvertently in front of the
antenna.
Canopy module
Antenna of 900-MHz AP or SM
2.4-, 5.2-, 5.4-, or 5.7-GHz radio
with no reflector
2.4-, 5.2-, 5.4-, or 5.7-GHz radio
with a reflector
At these and greater separation distances, the power density from the RF field is below
generally accepted limits for the general population.
2.1.1

Calculations for Separation Distances and Power Compliance Margins

Limits and guidelines for RF exposure come from:
◦ US FCC limits for the general population. See the FCC web site at
http://www.fcc.gov, and the policies, guidelines, and requirements in Part 1 of Title 47
of the Code of Federal Regulations, as well as the guidelines and suggestions for
evaluating compliance in FCC OET Bulletin 65.
◦ Health Canada limits for the general population. See the Health Canada web site at
http://www.hc-sc.gc.ca/rpb
◦ ICNIRP (International Commission on Non-Ionizing Radiation Protection) guidelines
for the general public. See the ICNIRP web site at http://www.icnirp.de/ and
Guidelines for Limiting Exposure to Time-Varying Electric, Magnetic, and
Electromagnetic Fields.
The applicable power density exposure limits from the documents referenced above are
◦ 6 W/m
◦ 10 W/m
Peak power density in the far field of a radio frequency point source is calculated as follows:
Issue 1.1 April 2006

Table 3: Exposure separation distances

Minimum separation distance from all persons
NOTE:
These are conservative distances that include compliance margins. In the case of
the reflector, the distance is even more conservative because the equation used
models the reflector as a point source and ignores its physical dimensions.
and Safety Code 6.
2
for RF energy in the 900-MHz frequency band in the US and Canada.
2
for RF energy in the 2.4-, 5.2-, 5.4-, and 5.7-GHz frequency bands.
60 cm
20 cm
1.5 m
Table 3.
24 in
8 in
60 in (5 ft)
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