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RE: Low Impedance Negative Resistance Tesla Coils

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

On 31 Jan 2005, at 7:18, Tesla list wrote:

> Original poster: "Ken Jenkins" <thecompman@xxxxxxxxxxxx>
> Just a Thought..
> What if you used super conductive wire to build your Primary &
> Secondary coils, Solenoid wound secondary close coupled. Then put the
> whole thing in Liquid helium or nitrogen... Wouldn't this give you a
> coil with virtually no resistance?? Like I said Just a thought.. Ken
> J.

Virtually being the operative word (some radiation is an inescapable
loss) and even if you could make the coil itself lossless, the
benefits in a SG coil would be swamped by gap losses. I'd be
surprised if it made much difference in a SSTC although as little
resistance as possible in the primary might well make a difference.
The point is, a well-built coil is already pretty good with the bulk
of the losses (ignoring output discharges) occurring in other


> -----Original Message-----
> From: Tesla list [mailto:tesla@xxxxxxxxxx]
> Sent: Sunday, January 30, 2005 3:01 PM
> To: tesla@xxxxxxxxxx
> Subject: Re: Low Impedance Negative Resistance Tesla Coils
> Original poster: "Malcolm Watts" <m.j.watts@xxxxxxxxxxxx>
> On 28 Jan 2005, at 11:51, Tesla list wrote:
> > Original poster: stork <stork@xxxxxxxxxxxxxxxxxxx>
> >
> > I have often been struck by the theoretical implications of
> negative > resistance in regenerative antennae and have wondered
> about their > application to TCs. It would be attractive to design
> a TC coil where > DC resistance is eliminated and 100% of input
> power is devoted to > output reactive power only. Apparently this
> concept was not lost on > Tesla as he wrote about it over a year
> ahead of Armstring and his > early regenerative oscillators.
> Further thought suggests easy > application to CW tube TCs and even
> solid state TCs which have caught > our fancy and seem to be the
> rage of Tesla coiling currently. And, > rightly so. > >
> http://www.tfcbooks.com/articles/tws5.htm > > stork
> Regeneration requires the use of a power supply to overcome the real
> loss so in terms of power spent you actually only gain a further
> inefficiency. This is quite different to increasing the collecting
> power of an antenna.
> Malcolm