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Re: Results of new single static gap
to: Jim
Even with small coils any type of helix usually results in overcoupling.
We prefer a flat spiral and then check the coeff. of coupling using
standard techniques. The copper strap is .030 inch thick x 5/8 inch wide
and is edge wound into slots cut into a piece of white delrin block -- pcs
in all arranged in a circular fashion. Pri-sec spacing is usually 1 1/2
inches and sec first turn always starts 1 inch above the primary horizontal
plane. There are different ways to do it but this seems to work best for
us as we have a special jig fabricated to make the slitter cuts on our
lathe. We can cut a set of 8 pcs in around 10 minutes with the jig.
DR.RESONANCE-at-next-wave-dot-net
----------
> From: Tesla List <tesla-at-pupman-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: Results of new single static gap
> Date: Sunday, August 30, 1998 3:53 PM
>
> Original Poster: Dsurfr-at-aol-dot-com
>
> Dr. Res: Would you be a little more explicit about the copper strapping
you
> use for your primary coils. I was thinking of switching to a pancake coil
of
> brass weather stripping (for doors) if I could get a long enough length,
but
> from many postings on the list I assumed a saucer shaped copper tubing
coil
> was the best way to go. My first primary was a 75 degree helical shape
made
> from #10 copper ground wire & then I tried a pancake made from coax cable
I
> had on hand & got better results (with a lot less work in winding!)
Thanks,
> Jim
>