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Re: Tunable Primary coil
Tesla List wrote:
>
> Subscriber: nikki-at-fastlane-dot-net Sun Jan 19 14:05:29 1997
> Date: Sun, 19 Jan 1997 10:49:02 -0600 (CST)
> From: Bert Pool <nikki-at-fastlane-dot-net>
> To: tesla-at-pupman-dot-com
> Subject: Tunable Primary coil
>
> Just thought I'd give a quick update on the tunable primary I've been
> building for my large magnifier.
>
> It ended up being 29 inches in diameter. Magnifiers typically use a
> cylinderical primary with a tightly coupled secondary inside, and this uses
> this same design. Insulation between the two is usually very heavy poly
> steeting.
>
> All my primaries in the past have been roughly tuned by tapping the turns
> for approximate tune, then half or quarter turns for final tune - sound
> familiar? In about 1976 I came up with a design for a primary that allows
> you to change the spacing between the turns to do precision tuning, even as
> the coil is running.
<SNIP>
> A friend and I will be measuring the amount of inductance shift the tuning
> arrangement provides later this Sunday. We also are abount to insulate the
> secondary and hope to fire up this magnifier for the first time!
>
> I'll post the results of the measurements and whether we set any smoke free
> later.
>
> Bert Pool
> nikki-at-fastlane-dot-net
Bert,
Great idea - Looking forward to seeing the results! Could you post any
pictures of this setup? I'm having a little bit of a hard time picturing
the mechanism involved. Thanks!
-- Bert --