Re: More Coupling...

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <paul-at-abelian.demon.co.uk>

Barton B. Anderson <tesla123-at-pacbell-dot-net> wrote:

> Yep, hopefully you received my "transposition" post. When I sent
> it, it arrived back from my ISP as though it didn't make it to the
> list, but I just downloaded it tonight with the rest, so I guess it
> made it out there.

It did, and our posts are nearly back in sync!

> Anyway, secondary is 87.6mH (1041 turns closewound) and primary
> is 107uH (11.6 turns).

Yep, I guessed 1043 turns.

> The secondary is a measured value, and the primary is calc'd from
> the tap. Tell you what, I'm off work Monday and should have some
> time between now and then to make another measurement. When I do
> this, I'll take 1/4" incremental readings from 2" below to 2" above
> primary base and post back to the list.

That range -2" to +2" does seem to be where all the action is. You'll
get greater accuracy if you can step up the primary current. A method
I use is to energise a standard toroidal mains transformer via a
variac, and pass a single turn of welding cable through the center of
the core. You can usually get 50 amps induced that way. Pass the
cable through a couple of times for 100 amps or more.

Cheers,
--
Paul Nicholson,
Manchester, UK.
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