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Re: Low Impedance Negative Resistance Tesla Coils

Original poster: Ed Phillips <evp@xxxxxxxxxxx>

Original poster: "Ralph Zekelman" <gridleak@xxxxxxxxxxxxxx>

Yes, it has been tried and it works. I did it back in high school
physics using a
5 Hz tunable LC circuit. The teacher got a flask of liquid nitrogen. We
used a
Heathkit O-scope and sig gen to graph the response curves at room
and with the LC circuit in the nitrogen.

It would be hard to see how to do this with anything but the smallest


	Some of you might be interested in modern work with microwave filters
using high-temperature superconducting elements to reduce losses and
improve selectivity.  Plenty of articles in the technical journals and
apparently there are already lots of them in commercial use in
connection with cellular phone terminals.