Figure T0-2

Estimated distances to meet RF power density guidelines with a horizontal half-wave dipole antenna (estimated gain, 2 dBi). Calculations include the EPA ground reflection factor of 2.56

Frequency: 7MHz
Estimated antenna gain: 2 dBi
Controlled limit:18.37 mW/cm2
Uncontrolled limit:3.67 mW/cm2

Transmitter
Power
(watts)

Distance to
controlled
limit

Distance to
uncontrolled
limit

100
500
1000
1500

1.4'
3.1'
4.3'
5.3'

3.1'
6.9'
9.7'
11.9'

Estimated distances to meet RF power density guidelines in the main beam of a typical 3-element "triband" Yagi for the 14,21 and 28 MHz amateur radio bands. Calculations include the EPA ground reflection coefficient of 2.56

Frequency: 28MHz
Estimated antenna gain: 8dBi
Controlled limit:1.15 mW/cm2
Uncontrolled limit:0.23 mW/cm2

Transmitter
Power
(watts)

Distance to
controlled
limit

Distance to
uncontrolled
limit

100
500
1000
1500

11'
24.5'
34.7'
42.5'

24.5'
54.9'
77.6'
95.1'

Estimated distances to meet RF power density guidelines in the main beam of a 17-element Yagi on a five-wavelength boom designed for weak signal communications on the 144MHz amateur radio and (estimated gain, 16.8 dBi). Calculations include the EPA ground reflection factor of 2.56

Frequency: 144MHz
Estimated antenna gain: 16.8 dBi
Controlled limit:1 mW/cm2
Uncontrolled limit:0.2 mW/cm2

Transmitter
Power
(watts)

Distance to
controlled
limit

Distance to
uncontrolled
limit

10
100
500
1500

10.2'
32.4'
72.4
125.5 '

22.9'
72.4'
162'
280.6'

Estimated distances to meet RF power density guidelines with VHF quarter-wavelength ground plane or mobile whip antenna (estimated gain, 1 dBi). Calculations include the EPA ground reflection factor of 2.56

Frequency: 146 MHz
Estimated antenna gain: 1dBi
Controlled limit:1 mW/cm2
Uncontrolled limit:0.2 mW/cm2

Transmitter
Power
(watts)

Distance to
controlled
limit

Distance to
uncontrolled
limit

10
50
150

1.7'
3.7'
6.4'

3.7'
8.3'
14.4'

Estimated distances to meet RF power density guidelines in the main beam of UHF 5/8 ground plane or mobile whip antenna (estimated gain, 4 dBi). Calculations include the EPA ground reflection factor of 2.56

Frequency: 446MHz
Estimated antenna gain: 4dBi
Controlled limit:1.49 mW/cm2
Uncontrolled limit:0.3 mW/cm2

Transmitter
Power
(watts)

Distance to
controlled
limit

Distance to
uncontrolled
limit

10
50
150

1.9'
4.3'
7.5'

4.3'
9.6'
16.7'