Motorola PTP 600 Series

Peak power density in the far field of a radio frequency point source is calculated as follows:

Where S = power density in W/m

P = Maximum Average transmit power capability of the radio, in W

G = total Tx gain as a factor, converted from dB

d = distance from point source, in m

4 .

d

GP

S

=

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.

Variable Band Antenna Max

Average

Transmit

Power in

Burst

(Watt)

P (Watt) G S

(W/m2)

D1 (m) Recom-

mended

Distance

(m)

Power

Compliance

Margin

5.4 GHz Integrated 0.005

(7dBm) 0.0025 200

(23dBi) 10 0.11 1 9

Integrated 0.32

(25dBm) 0.16 200

(23dBi) 10 0.5 2 4

External

2ft Flat

Plate 0.32

(25dBm) 0.16 631

(28dBi) 10 0.9 4 4.5

5.8 GHz External

6ft Dish 0.32

(25dBm) 0.16 6310

(38dbi) 10 2.83 10 3.5

1. Calculated

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 2ft and 6ft, alter the distance proportionally to the

antenna gain.