User's Manual

PTP 250 User Guide Compliance with safety standards
phn-2182_002v000
May 2011
4-25
Calculated distances and power compliance margins
Table 4-19 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.
Explanation of terms used in Table 4-19:
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)
Table 4-19 Power compliance margins
Band Antenna Tx Burst
(W)
P (W) G S
(W/m
2
)
d (m) R
(m)
5.4 GHz Integrated 0.0050 0.0050 200 10 0.089 1
Max gain
connectorized
0.0025 0.0025 398 10 0.089 1
ETSI 5.8
GHz
Integrated 0.0200 0.0200 200 10 0.178 1
Max gain
connectorized
0.0025 0.0025 1585 10 0.178 1
FCC 5.8
GHz
Integrated 0.1585 0.1585 200 10 0.502 2
Max gain
connectorized
0.1585 0.1585 5012 10 2.514 5
Gain of antenna in dBi = 10*log(G).
The regulations require that the power used for the calculations is the maximum
power in the transmit burst subject to allowance for source-based time-averaging.
At 5.4 GHz and EU 5.8 GHz, the products are generally limited to a fixed EIRP which
can be achieved with the Integrated Antenna. The calculations above assume that the
maximum EIRP allowed by the regulations is being transmitted.