PMP 400/430 and PTP 200/230 Series Configuration and User Guide
pmp-0042 (March 2014)
Page 94 of 98
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/m2 for RF energy in the 4.9, 5.4, and 5.7 GHz frequency bands.
Peak power density in the far field of a radio frequency point source is calculated as follows:
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
Table 31
shows calculated minimum separation distances
d
, recommended distances and resulting power
compliance margins for each frequency band and antenna combination.
Table 31: 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
The “Recommended Distances” are chosen to give significant compliance margin in all cases. They are also
chosen so that an OFDM module has the same exposure distance as a Canopy module, to simplify
communicating and heeding exposure distances in the field.
2
4
.
d
G
P
S
S
G
P
d
.
4
.