Re: [TCML] air core

[Jim Lux <jimlux@xxxxxxxxxxxxx>]

On 11/10/12 3:32 PM, JJR+weluvlucy.com wrote:
> Hello to the list,
> Has anyone ever built a secondary coil without a coil-form. Wouldn't air
> be the ideal coil-form because it has a dielectric constant of 1?

the dielectric constant doesn't necessarily change much in the way of 
performance .. what you worry about is loss  (disspation factor, loss 
tangent, etc.)

I suppose that having a different Cself for the secondary might change 
things a bit.. However, I think from a "spark generating" standpoint, my 
gut feel is that topload C is more important, because it can feed the 
growing streamer.





And,
> how would one wind a secondary of lets say 20 gauge wire with an end
> result of no plastic, paper, wood, etc. coil-form?

You could use an insulation that sticks to itself (perhaps by heating).

Greg Leyh did something similar to this for Electrum...I think he wound 
the secondary on a cardboard form, coated it with resin, then pressure 
washed the form out after it was done.

I think that performance isn't the reason you do these things, it's art 
and appearance.

Certainly there are things you could use for structural support that are 
better or worse.. you want something with decent dielectric strength, 
but that has low dissipation.  Fused silica or sapphire?


 Is it possible to
> wind the coil then remove the core that it was wound on. Also, doesn't
> coating the coil with some form of urethane etc. add capacitance to the
> coil which is undesirable?




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