Cambium PMP 450 AP, Руководство пользователя

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Chapter 4: Legal and regulatory information Compliance with safety standards
Page 4-24
Calculation of power density
The following calculation is based on the ANSI IEEE C95.1-1991 method, as that provides a worst case
analysis. Details of the assessment to EN50383:2002 can be provided, if required.
Peak power density in the far field of a radio frequency point source is calculated as follows:
Where: Is:
S power density in W/m 2
P maximum average 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:
Calculated distances and power compliance margins
Table 88 and Table 89 shows calculated minimum separation distances, recommended distances and
resulting margins for each frequency band and antenna combination for the USA and Canada. These are
conservative distances that include compliance margins. At these and greater separation distances, the
power density from the RF field is below generally accepted limits for the general population.
450 Platform Family ODU adheres to all applicable EIRP limits for transmit power when operating in
MIMO mode. Separation distances and compliance margins include compensation for both transmitters.
Explanation of terms used in Table 88 and Table 89 :
P burst – maximum average transmit power during transmit burst (Watt)
P – maximum average transmit power of the radio (Watt)
G – total transmit gain as a factor, converted from dB
S – power density (Watt/m2)
d – minimum safe separation distance from point source (meters)
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d
G P
S
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S
G P
d
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