EMF PROTECTION INFORMATION

Freq
Mhz 		Min. safe distance (metres) per EIRP (Effective Isotropic Radiated Power)
assuming 100% transmit power/cycle

 

 10w 50w 100w 200w 400w 800w
2 0.5 1 1.5 2 3 4
4 1 1.5 2 3 4 6
7 1 2 3 4 6 8

(calculation becomes fixed at 10Mhz)
10 - 400 1 2.5 3.5 4.5 6.5 9

(calculation becomes variable again above 400Mhz, reducing safe distances)

450

1

 2

3

4.5

6

8.5
1200 1 1.5 2 3 4 6.5

All safe distances shown have been rounded up to nearest 0.5 metres


USEFUL CALCULATORS

Convert dBW to Watts

Enter Value (dBW) :    =   Watts   

Convert Watts to dBW

Enter Value (Watts) :    =   dBW   

Calculating ERP and EIRP

Enter the Transmitter Power Output (TPO) :
Enter the Antenna Gain :
Enter TX mode :



 
Effective Radiated Power (ERP) =   Watts /  dBW
Effective Isotropic Radiated Power (EIRP) =   Watts /  dBW

Original JavaScript code for these calculators authored elsewhere
Modified 2020 by G4FJH