EZNEC and near field datas.
 

Hi to all

In EZNEC, when we want to get the near field datas, there is an option
to enter the input power. So for a 2 kW PEP power, in order to obtain
the V/m or A/m at a certain distance, should we directly enter 2000 W
in the input power window, or should we transform it to the effective
power 'RMS' value of 2000/sqrt(2) = 1414,2 W, and then enter 1414,2 W
instead?

Thanks for your help

de Pierre VE2PID

EZNEC and near field datas.
 

Hi to all

In EZNEC, when we want to get the near field datas, there is an option
to enter the input power. So for a 2 kW PEP power, in order to obtain
the V/m or A/m at a certain distance, should we directly enter 2000 W
in the input power window, or should we transform it to the effective
power 'RMS' value of 2000/sqrt(2) = 1414,2 W, and then enter 1414,2 W
instead?

Thanks for your help

de Pierre VE2PID

I am not familiar with EZNEC, but I would say that you must enter 2000W, simply
because the RMS concept cannot be applied to power (only "average power" exists,
not "RMS power").

RMS can be used for voltage or current, but not power.

So, "2kW PEP" means that the "average power around the instant in which power is
maximum" is 2kW.

Probably EZ-NEC returns you the RMS V/m or RMS A/m values around the instant in
which V/m or A/m is maximum.

73

Tony I0JX
Rome, Italy