Power Compliance Margins - Motorola PTP 300 Series User Manual

Rearranging terms to solve for distance yields
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
5.4 Integrated
GHz
External
3ft Dish
5.8 Integrated
GHz
External
2ft Flat
Plate
External
6ft Dish
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
Avoiding Hazards
Max
Average
Transmit
P
Power in
(Watt)
Burst (Watt)
0.005 0.00250
(7dBm)
0.00035 0.00017
(-4.6dBm) (34.6dBi)
0.32 0.16
(25dBm)
0.32 0.16
(25dBm)
0.32 0.16
(25dBm)
Table 3 Power Compliance Margins
P.G
d =
4πS
Variable d
(m)
G S
2
W/m
( )
200 10 0.06
(23dBi)
2884 10 0.06
200 10 0.5
(23dBi)
631 10 0.9
(28dBi)
6310 10 2.83
(38dbi)
20
Recom- Power
mended Compliance
Distance (m) Margin
1 15.9
2 4.0
4 4.5
10 3.5
(2)