CHAPTER 6: LEGAL AND REFERENCE
INFORMATION
COMPLIANCE WITH SAFETY STANDARDS
PAGE 6-73
Calculation of power density
Peak power density in the far field of a radio frequency point source is calculated as follows:
Note 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.
maximum average transmit power
capability of the radio, in W
total Tx gain as a factor, converted from
dB
distance from point source, in m
Rearranging terms to solve for distance yields:
Calculated distances and power compliance margins
The calculated minimum separation distances, recommended distances and resulting margins for each
frequency band and antenna combination is shown in the tables below. 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.
Explanation of terms used:
Tx burst maximum average transmit power in burst (Watt)
P maximum average transmit power capability of the radio (Watt)
G total transmit gain as a factor, converted from dB
S power density (W/m
2
)
d minimum distance from point source (meters)
R recommended distances (meters)
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