Avoiding Hazards; Preventing Overexposure To Rf Energy; Calculations For Separation Distances And Power Compliance Margins - Motorola PTP 600 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 600 family of
PTP wireless solutions so as to provide and maintain the minimum separation distances from
all persons as shown in Table 3.
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. 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.
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
Limiting Exposure to Time-Varying Electric, Magnetic, and Electromagnetic Fields.
The applicable power density exposure limits from the documents referenced above are:
•
2
6 W/m for RF energy in the 900-MHz frequency band in the US and Canada.
•
2
10 W/m for RF energy in the 2.4-, 5.2-, 5.4-, and 5.7-GHz frequency bands.
and Safety Code 6.
http://www.icnirp.de/
21
and Guidelines for