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Re: Tesla Coil RF Transmitter



Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 11:58 AM 9/19/2005, Tesla list wrote:
Original poster: Paul Nicholson <paul@xxxxxxxxxxxxxxxxxxx>

> [1988 Sutton/Spaniol paper]
> The Q values measured are of the order of 100-2000, limited by
> the resolution of the analyzer.

This is a very suspicious claim, and I would have to see the whole
paper to identify their errors.  The suspicion arises because no
researchers, before or since, specialising in that field, have
reported anything like such high Q factors.   These days it is
quite easy for amateurs to detect these resonances themselves
with sufficient S/N ratio such that a frequency modulated high Q
resonance would be most obvious.   For example, the apparent
bandwidth would vary systematically with integration time,
and with short integration times (order 10 secs) the high Q
resonance would make a clear 'line' on a spectrogram, rather than
the broad band of noise that we actually get.

Furthermore, there are all sorts of signal analysis techniques that can identify a
"wandering high Q resonator", effectively producing a very long integration time.


There are many, many ways to skin that cat aside from looking at it on a spectrum analyzer or with a series of FFTs.