Re: slinky/steel as conductor/skin effect Re: Flat Coils (II)

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>

Tesla list wrote:
 
> Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<jimlux-at-earthlink-dot-net>
 
> > (NB:
> > Someone may be thinking:
> > Steel.  Inductive Losses.
> > Turns out with the RF flowing mostly on the surface, losses
> > are not real dependent on conductor materials.  And these
> > are _expedient_, rather than optimized....)

> Even though the current is in the surface, it's still passing through
>steel,

	Being On The Surface (hence: skin effect) influence of
	material is minimal.
	(hint:
	Even at 60 Hz it is possible, sometimes desirable, to
	use hollow conductors:  no current, to speak of,
	in the middle.

> a not too hot conductor.
	However, for the current levels involved, there is a lot of it
	(large 'area' (surface area...).
 
>  Interestingly, skin effect is what sets the upper limit on waveguides.

	Concur.

> There is precedent for spark excited (disruptive) RF generators at
> millimeter waves (to keep this tesla coil related).  Somewhere around 1895,
> Bose made the first reported millimeter wave experiments in Calcutta using a
> spark excited resonator, at around 60 GHz.

	Yep.  SOMEwhere i have a 1960s vintage hp mag with reprint
	of his work.  'wireless' was (literally) everywhere at the
	time, with lots of investigators other than Marconi & 
	Tesla...

	best
	dwp