OT - Source for Air Variable Capacitors

[Elecraft mailing list]

I just bought one on eBay from "Radiohaus". It is beautiful, high quality, ball bearings, it spins freely so the torque requirements for a stepping motor are almost non-existant.
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[Robert Cunnings]

Yes, the stator-stator 15-120pF range applies to the mag loop
butterfly configuration. stator-stator is equivalent to 2 stator-rotor
capacitances (20-250pF) in series, approximately.

Bob NW8L

On Mon, 18 Jun 2018, Walter Underwood wrote:

> Here is a link to a butterfly capacitor at Radiohaus, without the eBay middleman.
>
> http://www.radiohausamerica.com/produto.php?prod=1703
>
> It looks nice, but I’m not sure I understand what they mean by the three different capacitance ranges. The normal mag loop configuration would be to connect the two stators to the circuit and leave the rotor floating, so I guess it is a 15-120 pF variable.
>
> • Stator - Stator: Aprox. 15 to 120pF
> • Stator - Rotor: Aprox. 20 to 250pF
> • Rotor - Conected Stators: Aprox. 40 to 480pF
>
> wunder
> Walter Underwood
> [hidden email]
> http://observer.wunderwood.org/  (my blog)

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