Re: New coil troubles

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Harold Weiss" <hweiss@xxxxxxxxxx>

Hi Christopher,

There's something else that can also cause racing, and that's arcing between
unused turns.  I had that happening on my 15" coil.  It liked arcing between
turns 8 and 9, and every time it did I had racing.  I shorted out the unused
turns and the racing stopped.  Shorting turns will cause other problems. If
unused turns are arcing, it's better to remove them.

David E Weiss

> Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>
>
> Tesla list wrote:
>  >
>  > Original poster: "Barton B. Anderson" <tesla111@xxxxxxxxxxxxx>
>  >
>  > Regardless of the coils pri to sec arcing, k is rather high and likely
>  > problematic, especially if your attempting to tune the coil. Thus, it's
>  > best to lower k to a relaxed value and then tune the coil. After it's
>  > tuned, one can play with coupling for best performance. In the end, I
would
>  > bet k will be set around 0.15 which may leave plenty of pri to sec
distance
>  > to prevent arcing. Someone here had mentioned this coil appeared to be
>  > forced into breakout. I would agree, that is a perfect description for
this
>  > coils troubles.
>
> With low coupling, the operation of the coil becomes less sensitive
> to the tuning. It's really easier to find the exact point with low
> coupling, because the changes are more clearly visible, but with high
> coupling, the tolerance is wider, and the coil works even with a
> large tuning error. It can really said to be "forced into breakout".
>
> Antonio Carlos M. de Queiroz
>
>
>