Re: Tesla Coil RF Transmitter

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>

At 12:08 PM 9/24/2005, you wrote:
> Original poster: "Dan" <DUllfig@xxxxxxxxxxxxx>
>
> Jim:
>
> Any resonant system will exhibit standing waves at certain frequencies.

What standing wave occurs in a lumped LC circuit?  There's reactive 
power circulating, but not really a standing wave, which sort of 
implies "propagation".

For that matter, is there a standing wave in a standard spark gap 
tesla coil?  Nope.. a couple lumped LC circuits (albeit with some 
uneven current distribution, etc.), not many waves travelling in that 
primary. Yes, one CAN model the system as a complex transmission 
line, but it fails the Occam's razor test.

> I have a feeling you are of the oppinion that the earth has no 
> resonant mode or frequency. Is this so, and why?

Actually, the point was that just because you observe a bandlimited 
phenomena, it's not necessarily because there's a resonance.  It 
might be, and it might not. The observation itself does not provide 
sufficient information to discriminate.

Sure, the earth has nice low Q resonant modes, but I don't think that 
implies a standing wave.  I think the Q is so low that the system is 
overdamped.