S = p " g 4 – Motorola Canopy FSK and OFDM radios PTP 100 (FSK) User Manual
Page 52
Release 11.0
Release Notes and User Guide Supplement
Issue 1, March 2011
Page
52
SJ/T11363-2006
11.3 RF EXPOSURE SEPARATION DISTANCES
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
Table 17
.
Table 17: Exposure separation distances
Module Type
Separation Distance from Persons
Canopy Module (FSK or OFDM)
At least 20 cm (approx 8 in)
Canopy Module with Reflector Dish
At least 1.5 m (approx 5 ft)
Canopy Module with LENS
At least 50 cm (approx 20 in)
AP Antenna of connectorized module or integrated
900 MHz module
At least 80 cm (32 in)
Indoor 900 MHz SM
At least 10 cm (4 in)
The following section and its
Table 18
provide details and discussion of the associated
calculations.
11.3.1 Details of Exposure Separation Distances Calculations 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
and Safety Code 6.
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
10 W/m
2
for RF energy in the 5.7/5.8-GHz frequency bands.
Peak power density in the far field of a radio frequency point source is calculated as follows:
!
S =
P " G
4
#
d
2
where
S = power density in W/m
2
P = RMS transmit power capability of the radio, in W
G = total Tx gain as a factor, converted from dB
d = distance from point source, in m