User Guide

PMP 450 Planning Guide Glossary
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 68 shows calculated minimum separation distances, recommended distances and resulting margins for
each frequency band and antenna combination. 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.
PMP 450 equipment 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 68:
Tx burst – maximum average transmit power in burst (Watt)
P – maximum average transmit power capability of the radio (Watt) (combined transmitters)
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)
C – compliance factor
2
4
.
d
GP
S
π
=
S
GP
d
.4
.
π
=
3-14
pmp-0047 (March 2014)