Avoiding Hazards; Preventing Overexposure To Rf Energy; Calculations For Separation Distances And Power Compliance Margins - Motorola PTP 300 series User Manual

2 Avoiding Hazards

2.1 Preventing Overexposure to RF Energy

CAUTION: To protect from overexposure to RF energy, install the radios for the 300 family of
PTP wireless solutions so as to provide and maintain the minimum separation distances from all
persons as 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.
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.

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/ewh-semt/pubs/radiation/99ehd-dhm237/limits-limites_e.html
and Safety Code 6.
ICNIRP (International Commission on Non-Ionizing Radiation Protection) guidelines for the
general public. See the ICNIRP web site at
Limiting Exposure to Time-Varying Electric, Magnetic, and Electromagnetic Fields.
The applicable power density exposure limits from the documents referenced above are:
6 W/m2 for RF energy in the 900-MHz frequency band in the US and Canada.
10 W/m2 for RF energy in the 2.4-, 5.2-, 5.4-, and 5.8-GHz frequency bands.
Peak power density in the far field of a radio frequency point source is calculated as follows:
Where:-
= power density
= Maximum Average transmit power capability of the radio W
= total Tx gain as a factor, converted from dB
= distance from point source
Avoiding Hazards
Table 3.
http://www.icnirp.de/
=
4
W m
m
19
and Guidelines for
(1)