User Manual

Avoiding Hazards
19
Rearranging terms to solve for distance yields
d =

P.G
4πS
(2)
2.1.1.1 Calculated Distances and Power Compliance Margins
Table 3 shows calculated minimum separation distances d, recommended distances and resulting
power compliance margins for each frequency band and antenna combination.
Band Antenna Max
Average
Transmit
Power in
Burst (Watt)
Variable
D
(m)
Recom-
mended
Distance (m)
Power
Compliance
Margin
P
(Watt)
G S
(
W/m
2
)
5.4
GHz
Integrated 0.005
(7dBm)
0.00250 200
(23dBi)
10 0.06 1 15.9
External
3ft Dish
0.00035
(-4.6dBm)
0.00017 2884
(34.6dBi)
10 0.06
5.8
GHz
Integrated 0.32
(25dBm)
0.16 200
(23dBi)
10 0.5 2 4.0
External
2ft Flat
Plate
0.32
(25dBm)
0.16 631
(28dBi)
10 0.9 4 4.5
External
6ft Dish
0.32
(25dBm)
0.16 6310
(38dbi)
10 2.83 10 3.5
Table 3 Power Compliance Margins
Notes:
1. 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.
2. At 5.4GHz the product is generally to a fixed EIRP which can be achieved with the Integrated
Antenna. If there are no EIRP limits, use the distance calculations for 5.8GHz.
3. At 5.8GHz, for antennas between 0.6m (2ft) and 1.8m (6ft), alter the distance proportionally
to the antenna gain