Re: secondary/primary distance

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

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Matt,

I retired my 12.5" this year and wound a smaller 8.5" coil. I added inward
turns on the old
primary which is a wee bit over 10.5" (so an inch spacing on my coil).

Take care,
Bart

Tesla list wrote:

> Original poster: "Matt Skidmore by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <fox-at-woozle-dot-org>
>
> im in the process of creating a new coil with a secondary with a diameter
> of 8.5 inches. what is a good diameter for the first turn of the primary?
> 10, 12 inches? what effect will this have on the coil?
>
> ive also been wondering about using 1/4 copper tubing vs 3/8 and then the
> spacing between turns.
>
> ive been playing with the java TC designer, and the TCcad program (all
> which are simply wonderful help). thr TCcad program doesnt like
> calculating for more then 15 turns. starts to calculate for me when i give
> it a primary diameter of about 24 inches (7.7 spacing between secondary
> and primary). any help on this would be greatly appreciated. thanks
>
> -matt