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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