[Lf] [Fwd: LF: vicious circle]

[Andre Kesteloot]

jannsen wrote:

> Hi All,
>
> I have got a theoretical problem:
>
> if I considerably change the output pwr of any tx -  sw or lf  -
> I have to readjust the matching equipment.
>
> more pwr means less inductivity to readjust the resonance of the
> aerial if the aerial is a dipole (sw) or a inv. L (lf).
>
> but - more pwr the more capacity to readjust the resonance
> if I use the TX-loop (lf; 70m long, 12m up and 2m above ground, two windings).
>
> is it the charge caused by the E- or H-field "on the spot" (as ON7YD
> wld put it)? If so, why have I to increase the impedance in one case and to
> decrease it in the other?
>
> does the reader have an answer or does he know where I can look up
> the theorems? is there any theorem?
>
> regards and tks in advc
>
> Uwe/dj8wx
>
>