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Registered Member #2566
Joined: Wed Dec 23 2009, 05:52PM
Location:
Posts: 147
Thanks for the reply.I didn't know of Helmholz work you mention.
radiotech wrote ...
The electrical cases are found in apparent subharmonics in non-linearalities especially in AC ferrite magnetizations.
Opposed to that tesla coils are quite a linear machines. The thing which may be confused with "subharmoonic" ,I think, are perhaps frekquencies of beats which are always present in more or less tuned 2 circuit tc system.
Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Back in the days of OLTCs we used to experiment with extremely high break rates. The coil would always work best if you adjusted the break rate so that it was a submultiple of the resonant frequency. As you adjusted the break rate, you'd see peaks and nulls in the spark output.
I think Tesla himself observed this back in the 1890s.
The Tesla resonator itself is linear, but the drive waveform, whether it comes from solid-state circuitry or a spark gap, is usually a square wave or some sort of rectangular pulse. The square wave contains the odd harmonics, a pulse wave with other than 50% duty contains all of the harmonics. Whenever a harmonic of the drive matches the resonant frequency of the Tesla resonator, you'll get sparks of some sort.
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
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Posts: 1546
Steve McConner wrote : As you adjusted the break rate, you'd see peaks and nulls in the spark output.
Two things, if the break rate was a submultiple of the coil Fr that would have been after the fact that the coil's Fr was already known, and not that it was originating Fr/n. If that was the case, then the coil would have been resonating at a harmonic of the break rate.
From Admiralty Handbook (1925) By using a very short gap and using some means of restoring gap insulation, such as a rotary spark gap, it may be possible to obtain 2 sparks per half cycle (of the AC source driving) The thing they are talking about here covers issues (need for 'Terry Filters") and damping which decides whether or not the spark (which is the sole source of the RF that fires the coil) will drive the coil at the natural resonance.
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Idea: harmonically driven TC
