User's Manual

PMP 400/430 and PTP 200/230 Series Motorola PMP Solutions User Guide Supplement
Issue 6.0 May 2011 Page 72 of 77
Health Canada limits for the general population. See Safety Code 6 on the Health
Canada web site at
http://www.hc-sc.gc.ca/.
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 5.4-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
Rearranging terms to solve for distance yields
d
P G
4
S
Table 18 shows calculated minimum separation distances d, recommended distances and
resulting power compliance margins for each frequency band and antenna combination.
Table 18: Calculated Exposure Distances and Power Compliance Margins
Frequency
Band
Antenna
Variable
d
(calcu-
lated)
Recom-
mended
Separation
Distance
Power
Compliance
Margin
P
G
S
5.4 / 5.8
GHz OFDM
Integrated,
10 dBi
0.079 W
(19 dBm)
10
(10 dB)
10
W/m
2
or 1
mW/c
m
2
8 cm
20 cm
(8 in)
6.3
Connectori
zed, 17 dBi
0.05 W
(10 dBm)
50
(17 dB)
10
W/m
2
or 1
mW/c
m
2
6 cm
20 cm
(8 in)
10
4.9 GHz
OFDM
Integrated,
10 dBi
0.079 W
(19 dBm)
10
(10 dB)
10
W/m
2
or 1
mW/c
m
2
8 cm
20 cm
(8 in)
6.3
Connectori
zed, 17 dBi
0.063 W
(18 dBm)
40
(16 dB)
10
W/m
2
or 1
mW/c
m
2
14 cm
20 cm
(8 in)
2