Find Field

Antenna Gain at the desired frequency

dBi

Test Distance

m

Amplifier Power

watts

System Losses (cable, connector, …)

dB

 

V/m

=
\( \frac{\sqrt{30\cdot Watts\cdot 10^[{\frac{Gain_{dBi}-Loss_{dB}}{10}}]}}{Meters} \) CW Signal

%

=
AM Modulation Depth (per IEC 61000-4-3)

V/m

=
CWV/m / (1+AM%*0.01)
 

Find Required Power

Antenna Gain at the desired frequency

dBi

Test Distance

m

Desired Field level

V/m

System Losses (cable, connector, …)

dB

 

Watts

=
\( \frac{(V/m\cdot meters)^{2}}{30\cdot 10^{[\frac{Gain_{dBi}-Loss_{dB}}{10}]}} \) CW Signal

%

=
AM Modulation Depth (per IEC 61000-4-3)

Watts

=
CWwatts * (1+AM%*0.01)2
 

Find Antenna Gain Needed

Amplifier power

Watts

Test Distance

m

Desired Field level

V/m

System Losses (cable, connector, …)

dB

 

GaindBi

=
\( [10\cdot LOG{\frac{(V/m\cdot meters)^{2}}{30\cdot Watts}}]+ Loss_{dB} \) CW Signal

%

=
AM Modulation Depth (per IEC 61000-4-3)

GaindBi

=
CWGain+ 20*LOG(1+AM%*0.01)
 

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