Motorola 4940AP, Дополнение к руководству пользователя

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PMP 400 and PTP 200 Series Canopy User Guide Supplement
Issue 3, January 2009 Page 41 of 45
6.3.1 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 Safety Code 6 on the Health
Canada web site at
http://www.hc-sc.gc.ca/ewh-semt/pubs/radiation/99ehd-dhm237/index_e.html .
•
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 10 shows calculated minimum separation distances d , recommended distances and
resulting power compliance margins for each frequency band and antenna combination.
Table 10: Calculated Exposure Distances and Power Compliance Margins
Variable Frequency
Band Antenna
P G S
d
(calcu-
lated)
Recom-
mended
Separation
Distance Power
Compliance
Margin
Integrated,
17 dBi
0.05 W
(10 dBm)
50
(17 dB)
10
W/m
2
6 cm 20 cm
(8 in)
10 5.4 GHz
Connectori
zed, 17 dBi
0.05 W
(10 dBm)
50
(17 dB)
10
W/m
2
6 cm 20 cm
(8 in)
10
Integrated,
16 dBi
0.063 W
(18 dBm)
40
(16 dB)
10
W/m
2
14 cm 20 cm
(8 in)
2 4.9 GHz
Connectori
zed, 16 dBi
0.063 W
(18 dBm)
40
(16 dB)
10
W/m
2
14 cm 20 cm
(8 in)
2