Calculated Distances And Power Compliance Margins; Table 3 - Power Compliance Margins - Motorola PTP 500 Series User Manual

1.8.4 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.
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.
Band Antenna Max
Average
Transmit
Power in
Burst
(Watt)
0.005
Integrated (7 dBm)
5.4
GHz
External 0.00035
4ft Dish (-4.6 dBm)
0.020
EU
Integrated (13 dBm)
5.8
External 0.0014
GHz
4ft Dish (-1.4 dBm)
0.32
Integrated (25 dBm)
FCC
External
2ft Flat 0.32
5.8
Plate (25 dBm)
GHz
External 0.32
6ft Dish (25 dBm)
NOTE
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.
If there are no EIRP limits in the country of deployment, use the distance calculations
for FCC 5.8 GHz for all frequency bands.
At FCC 5.8 GHz, for antennas between 0.6m (2ft) and 1.8m (6ft), alter the distance
proportionally to the antenna gain.

Table 3 - Power Compliance Margins

Variable
P G
(Watt)
200
0.00250 (23 dBi)
2884
0.00017 (34.6 dBi)
200
0.01 (23 dBi)
2884
0.0007 (34.6 dBi)
200
0.16 (23 dBi)
631
0.16 (28 dBi)
6310
0.16 (38 dBi)
9
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d Recom-
(m)
mended
S
2
(W/m )
Distance
(m)
10 0.06
1
10 0.06
10 0.13 1
10 0.13 1
10 0.5 2
10 0.9 4
10 2.83 10
Power
Compliance
Margin
15.9
7.6
7.6
4.0
4.5
3.5