Re: NEC-LIST: Coil-loading.

At 11:31 AM 2/8/2005, Jacob Schanker wrote:
>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.

Or wax, low melting metal alloys (Wood metal) or a variety of water soluble
modeling compounds.

For that matter, depending on the frequency, you could probably find a
plastic that is low loss.

>Regards,
>

James Lux, P.E.
Spacecraft Radio Frequency Subsystems Group
Flight Communications Systems Section
Jet Propulsion Laboratory, Mail Stop 161-213
4800 Oak Grove Drive
Pasadena CA 91109
tel: (818)354-2075
fax: (818)393-6875

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