Re: Stuborn Little Coil!

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: tesla popp <teslas_lab@xxxxxxxxx>

I now have a "scrap wire" primary of #8 wire
(untested).  I have a .01875uF MMC.  I will eventually
have a ASYNC rotary and a .0375uF cap.  any other
ideas you have I will try, (Since I have respect for
your advice D.C.)

--- Tesla list <tesla@xxxxxxxxxx> wrote:

> Original poster: "D.C. Cox" <resonance@xxxxxxxxxx>
>
>
>
> You need a "scrap wire" pri of 25-30 turns to find
> the proper tuning
> point. This can be a flat spiral lying on cardboard
> or
> plywood.  Proper capacitance would be around
> .015-.016 uF, so,
> assuming you have this value or close to it, then
> you might need
> 15-18 turns on the pri depending on your topload.
> Using scrap wire
> primaries always allows you to explore the full
> range of tuning prior
> to making a fixed pri.  If you have less turns than
> you need you will
> be plagued with racing sparks and other problems
> until you hit the
> proper tuning point.
>
> You could also check the tuning with a sig generator
> and oscope ---
> that will get you usually within 1/2 to 1 turn of
> the correct value.
>
> Dr. Resonance
>
> >I scrapped the crap-worth helical primary coil I
> made,
> >and swapped it with a pancake at 15 degrees.  Im
> >tapped at 10 turns with 3 to spare.  I am using a
> >static gap for now "this is PART of the problem".
> My
> >secondary is 3.5" x 13" wound with 1300 turns.
> >Coupeling is tight.
> >
> >Im only getting maby 10" of spark from this coil,
> and
> >the spark ain't impressive either.  I am at a loss
> as
> >to why this little beast SUCKS so badly.
> >
> >BTW: this is the same coil I had racing sparks
> with,
> >cardboard tube primary was the cause.
> >
> >Throw some ideas @ me.  Thanks for any thing you've
> >got.
> >
> >Coiler Forever: Jeremiah Popp
> >
> >PS: I STILL NEED YOUR INFO FOR THE "Coilers World
> Map"
> >project!!!!!  Remember to put "Private info" or
> >"Public Info" as the subject.
> >
> >
>
>