Re: Tesla Coil RF Transmitter

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Gary Peterson" <gary@xxxxxxxxxxxx>


> Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>
>
> > Original poster: William Beaty <billb@xxxxxxxxxx>
> >
> > . . . Even the shortest antenna must always radiate SOME
> > electromagnetic waves, and if an impedance-matching network is 
> > involved, then far more energy gets out than one might expect.

> Indeed.. the radiation resistance gets very small, but if you can 
> keep the loss resistance also small, then the efficiency is still 
> good.  What's happening is that the ratio of energy radiated per 
> cycle gets small compared to the energy stored in the antenna and 
> the surrounding fields (the reactive near field).

Of course, the current flowing through the loss resistance of an 
inefficient "antenna" is, to a Tesla-coil transmitter, the current 
that is not radiated but trapped within the entire resonating system, 
including the earth and the distant receiving transformer.

Gary