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Re: Number of turns for a secondary?

Hi Jason and Ed,


Tesla List wrote:

> Original Poster: Ed Phillips <evp-at-pacbell-dot-net>
>
> Tesla List wrote:
> >
> > Original Poster: Jason Zuberer <jason-at-vortexia-dot-com>
> >
> > I have heard varying things about how to wind a secondary. What is more
> > important, hight to width ratio of 3:1 or not exceeding 1,000 turns? I
> > am not sure if it is coincedence but the first secondary that I wound
> > was matched to come as close to 1,000 turns as possibe without exceeding
> > it, but that broke the 3:1 height to width ratio. I ended up stripping
> > of 4 inches of turns to increase performance, in taking off 4 inches I
> > matched the height to width ratio.
> >         Is it possible to wind a secondary over 1,000 turns if the proper
> size
> > requirements are met and still get good performace?
> >
> >                         Thanks in advance,
> >
> >                                 Jason Zuberer
>
>         It will be interesting to see what the "big boys" say, but those
rules
> sound very arbitrary, and perhaps even nonsensical.  I suspect that, in
> the case you mention, you would have been at least as well off leaving
> the extra four inches on the coil.  As long as you have everything tuned
> OK, the results should be fine.
>
> Ed

I would like to express that turns and geometric ratio's are guidlines and not
rules. I would not go as far as to call them non-sense. Over the past couple
years, several coilers who have built coils at several extremes have expressed
their own performance and on average, the census agrees that coils perform
well
with turns ratio's between 500 and 1,000 turns and h/d ratio's between 3:1
to 5:1.
But, you must keep in mind that performance is based in many cases as
longest arc
lengths with less problems such as primary strikes, etc... I guarantee that a
1,500 turn coil can perform as well as a 1,000 turn coil, but I can't
gaurantee
that a 2,000 turn coil will. Much of what governs turns is wire size, coil
diameter, how much energy you are pumping into a coil, what size Cp you are
running, how much inductance you want, if you are designing for a specific
frequency, etc... Everyone has a little different approach. Guide lines are
really
nothing more than a guide to keep a new coiler from going way way out in
no-arc
land.

Jason, I would absolutely agree with Ed that if it was me, I would not have
decreased the number of turns. I don't think you will gain anything. I
should add
that I don't believe you are going to lose anything either, unless you are
pumping
a lot of juice into the coil. You may then wish you were in the 5:1 ratio or
somewhere around that when arcs start hitting your primary.

FWIW,
Bart