Check http://jeff560.tripod.com/loomis.html,, just used ground currents
which may have excited his kite wire,,,,,
Bob K3DJC
>
> And: Does anybody of the group want to buy such a kite? A second
> "kite-station" would give the chance for a 2 way QSO there! Maybe in
> good old CW! :-)
>
> 73, Stefan/DK7FC
>
> ________________________________
>
> Von: [email protected] im Auftrag von Paul
> Nicholson
> Gesendet: Mo 08.03.2010 07:57
> An: [email protected]
> Betreff: Re: LF: VLF TX coil ready
>
>
>
> Stefan Schäfer schrieb:
>
> > [VLF loading coil] has about 1100 turns. Average diameter is
> > about 0,55m, hight about 0,5m.
>
> I ran this info through a modelling program, with a guess that
> the wire is 26awg:-
>
> Ldc: 482mH
> Rdc: 258.3 ohms
>
> Resonances, unloaded, base grounded, stood vertically 10cm
> above a good ground with nothing within a few metres:-
>
> 1/4 wave : 46.56 kHz
> 3/4 wave: 121.7 kHz
> 5/4 wave: 195.5 kHz
>
> Adding a 100m kite, 2m diameter, raised vertically (=560pF) to
> the model, I found I needed an extra 70pF of shunt loading to
> bring the system into tune.
>
> The system resonances then become:
>
> 1/4 wave: 8.973 kHz
> 3/4 wave: 116.3 kHz
> 5/4 wave: 185.4 kHz
>
> Hopefully you can seal the coil before the thing warms up and
> the turns fall out of place!
>
> > TX power of 200W.
>
> I bet you will need more, eg 500W. Very hard to predict the
> Q factor obtained in the field, but it is always lower than what
> you hope it will be!
> --
> Paul Nicholson
> --
>
>
>
>
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