Re: NEC-LIST: Near Field Values with 4nec2

Hello...

> I use 4nec2 and when i plot the results given from a Near Field
> Electric Value Computation I note that the values plotted are very
> bigger than the expectation.
> If I take the value from the *.out file and I calculate the magnitude
> this value agree with the theory, so I think that it's a problem of
> the tool 4nec2. I note that the envelope of the values plotted from
> the 4nec2 is similar the one who I have obtained by myself. I suppose
> that the values are multiplied for a incomprehensible factor.

Yes you are correct. The below is from the 4nec2 help (or 4nec2.rtf):

***

Please note that the Voltages and Currents specified in the 4nec2 program
are effective values. These are calculated from the maximum values as
generated by the nec-2 engine. (multiplication with 0.707)

Furthermore the voltage- and current-values displayed are in accordance with
the 'input-power' as specified through the Settings menu-bar option

---
The 'input-power' setting is used to compute the structure currents and the
magnitude for the near electric and magnetic field. The effect is that the
voltage for the voltage source on the EX card is modified in such a way as
if it would be perfectly matched and delivers the specified power to the
antenna structure. (Constant power mode) If you would like to keep the
original specified voltage in the EX card, please specify a power of 0
(zero) watts. (Constant voltage mode)
Mult-factor = srqt(specified_input-power / nec-2_input_power)
****
I hope this does make things a bit more clear. In case you have further
questions and/or suggestion, let me know.
I'll add some further explanation about the subject in the 4nec2 help files.
Greetings to all,
Arie Voors.
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