Re: Secondary Resonance LC and Harmonics.

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>

On 26 Jun 2005, at 14:22, Tesla list wrote:

> Original poster: "Chris Rutherford" <chris1@xxxxxxxxxxxxxxxxxxx>
>
> Hi All,
>
> Does the formula  f0 = c/4 x 1 (c=light m/s, l=wire length.) and this
> statement by Tesla mean anything to anyone?
>
> "The exact attunement of the two circuits (windings) secures great
> advantages, and, in fact, it is essential in the practical use of the
> system In order to attain the best results it is essential that the
> length of wire, from the ground connection to the top, should be equal
> to one-quarter of the wavelength of the electrical vibration of the
> wire."  -Dr Tesla

He was later forced to recant that view in the face of physical
reality.

Malcolm

> Are we assuming the elctrons in the wire are reaching a relatabvistic
> velocity due to the high potential?
>
> http://www.griffithobs.org/exhibits/Tesla%20Coil%20Exhibit/tcoil.html
>
> The coil in the diagram appears cone shaped, is this just the
> illustration or would there be a practical reason for this?
>
> Thanks
>
> Chris
>
>
>
> ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx> To:
> <tesla@xxxxxxxxxx> Sent: Sunday, June 26, 2005 12:38 AM Subject: Re:
> Secondary Resonance LC and Harmonics.
>
>
> >Original poster: "Mike" <mike.marcum@xxxxxxxxxxxx>
> >
> >I would personally just use half the secondary and make 2 4x21's with
> >1000 turns each.
> >
> >Mike
> >----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> >To: <tesla@xxxxxxxxxx> Sent: Saturday, June 25, 2005 5:46 PM Subject:
> >Secondary Resonance LC and Harmonics.
> >
> >
> >>Original poster: "Chris Rutherford" <chris1@xxxxxxxxxxxxxxxxxxx>
> >>
> >>Hi All,
> >>
> >>I've just wound my first secondary, and in my eagerness I ignored
> >>most guidance and just wound as many turns as possible on a piece of
> >>3.5' x 4" tubing.  It turned out to be approximately 2K turns
> >>(gulp).
> >>
> >>I managed to get my hands on a nice stainless steel sphere, which
> >>sits nicely on top.  I was just 'playing' with my scope and signal
> >>generator, when I discovered that when I set the sig gen to
> >>oscillate at 76KHz or 416KHz I don't need to connect it to the coil
> >>in order to show the signal on my scope, I only need to touch the
> >>probe and the signal magically gets on to the coil and scope!  - I'm
> >>guessing that my coil and top sphere are acting as a tuned LC tank
> >>circuit, with a resonant frequency of 76KHz and a harmonic of
> >>416KHz.  Either side of these frequencies the signal drops off.
> >>
> >>Does this make sense?  Has anyone else experienced something like
> >>this? How *badly* tuned is my coil?  Should I take some turns off it
> >>(not yet varnished)?
> >>
> >>Thanks
> >>
> >>Chris
> >>
> >
> >
> >
>
>
>
>