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Re: Tesla Coil RF Transmitter (long)

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi Boris,

Interesting. A 9 kHz coil could be built at a little over 3"ft diameter with a 4.75:1 h/d and an appropriately sized toroid. The coil size, in my mind, is why coilers don't build coils down at this frequency (for most of us). I would be interested in how you could build a similar coil of lesser size. Could you give an example?

Thanks,
Bart

Tesla list wrote:

Original poster: boris petkovic <petkovic7@xxxxxxxxx>


Finn,Dan,

Apparently,G.Leyh faces the challenge how to overcome
problems of this kind for a very low frequency coil.
The monster size twin coil (ALF) is planned to
resonate near 6 kHz (the consequence of its size and
other constructing factors).
Needless to say ,TCs do not have to be so big to
resonate below 10 kHz.

Regards,
Boris

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: Finn Hammer <f-h@xxxx>
>
> Dan,
>
> Calculate a secondary coil that resonates at 9kHz,
> and ponder it`s
> parameters. Look for size or resistance in wire.
>
> Calculate the time of one ringdown with 0.15
> coupling
> coefficient,2nd. notch quenching, then add time for
> recharging the
> cap. How many bps can you drive the coil at?
>
> Do these calculations, and you have your answer.
>
> Cheers, Finn Hammer
>
> Tesla list wrote:
>
> >Original poster: "Dan" <DUllfig@xxxxxxxxxxxxx>
> >
> >By the way, in the US anything under 9kHz is not
> regulated by the
> >FCC. I am wondering why not build coils in that
> range?
>
>
>
>