Re: NEC-LIST: Coil-loading.

Styrofoam would work well, wouldn't it? The ice is a good idea though.

   Dave

-----Original Message-----
From: nec-list-bounces+drcuthbert=micron.com_at_robomod.net
[mailto:nec-list-bounces+drcuthbert=micron.com_at_robomod.net] On Behalf Of
Jacob Schanker
Sent: Tuesday, February 08, 2005 12:31 PM
To: nec-list_at_robomod.net
Subject: Re: NEC-LIST: Coil-loading.

Jerry:

Solid core toroids are hard enough to wind, needing special machinery if
not
done by hand. Air core toroids, I believe, would be more difficult
still.
That's likely why they are not seen.

If anyone is interested in experimenting with air core toroids, the way
to
try is to use a sacrificial core of frozen water (ice). After winding
with
stiff copper wire, the ice core will melt away, leaving an air core
toroidal
coil.

Regards,

Jack

Jacob Z. Schanker, P.E.
65 Crandon Way
Rochester, NY 14618

Tel: 585 442 3909
Fax: 585 442 2182
j.schanker_at_ieee.org

"Jerry Flanders" <jeflanders_at_comcast.net> writes:
>
> But air-core toroids never became popular, or at least I have never
seen
> one in manufactured equipment. If I am right about the more desirable
> electrical characteristics, why didn't we use this form even before
modern
> core materials were developed?
>
> Jerry W4UK
>

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