Re: electromagnetic wave fundamental frequency and harmonic series?

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Steve Conner <steve@xxxxxxxxxxxx>



> Imagine that one has a 50 kHz Tesla coil RF transmitter with an air 
> terminal that is elevated exactly 1.5 meters above the resonator's 
> top turn.  If during operation, in addition to the 50 kHz primary 
> excitation current, a 50 MHz signal were to be coupled to the 
> resonator, would the vertical conductor that connects the resonator 
> to the terminal efficiently radiate a 50 MHz RF signal?  What would 
> be the observed effect at an identical Tesla coil RF receiver?

I'm sure it would radiate pretty efficiently. You could easily excite 
the 50MHz resonance by allowing the air terminal to arc to another 
nearby grounded terminal, in which case you would have a VHF spark 
transmitter very similar to Hertz's original experiment (and some 
experiments that Tesla tried at Colorado Springs, too.)

An identical receiving coil would have its 1.5 meter conductor 
section pinged into resonance by the received 50MHz waves. It would 
also have its 50kHz resonance excited by the 50kHz component of the 
other coil's output. From my experience playing with ham radios, I 
expect the 50MHz component would be receivable at far longer 
distances than the 50kHz. Not because it propagates any better, but 
because the Tesla coils would make more efficient antennas in the 
case where their dimension matches the wavelength.

Steve Conner