Calculated Distances And Power Compliance Margins; Table 3 - Power Compliance Margins - Motorola PTP 300 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
Integrated
5.4
GHz
External
4ft Dish
EU
Integrated
5.8
External
GHz
4ft Dish
Integrated
FCC
External
2ft Flat
5.8
Plate
GHz
External
6ft Dish
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.
4Gon www.4Gon.co.uk info@4gon.co.uk Tel: +44 (0)1245 808195 Fax: +44 (0)1245 808299

Table 3 - Power Compliance Margins

Max Variable
Average
Transmit P G
Power in (Watt)
Burst
(Watt)
0.005 200
(7 dBm) 0.00250 (23 dBi)
0.00035 2884
(-4.6 dBm) 0.00017 (34.6 dBi)
0.020 200
(13 dBm) 0.01 (23 dBi)
0.0014 2884
(-1.4 dBm) 0.0007 (34.6 dBi)
0.32 200
(25 dBm) 0.16 (23 dBi)
0.32 631
(25 dBm) 0.16 (28 dBi)
0.32 6310
(25 dBm) 0.16 (38 dBi)
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
9
1 About This User Guide
Power
Compliance
Margin
15.9
7.6
7.6
4.0
4.5
3.5