Re: primary coil windings

From: 	DR.RESONANCE[SMTP:DR.RESONANCE-at-next-wave-dot-net]
Sent: 	Sunday, August 10, 1997 12:38 PM
To: 	Tesla List
Subject: 	Re: primary coil windings

To: Kevin

Almost any geometry will work but the trick is to set the coefficient of
coupling between the pri and sec inductors at a value of between 0.18 and
0.22.  Try 0.2 as a starting point.  This is achieved by raising your sec
coil with some scrap plywood about 1/4 inch at a time until you obtain best
spark output.

Many coils in the 8" dia and above seem to operate best with a flat spiral
primary.  Smaller coils in the 2-7 inch dia range seem to perform well with
a short solenoid type winding.  Keep the primary coilform dia at least 2.5
to 2.8 times the sec. dia to avoid overcoupling.  

Tune for best spark output and enjoy!


> From: Tesla List <tesla-at-pupman-dot-com>
> To: 'Tesla List' <tesla-at-poodle.pupman-dot-com>
> Subject: primary coil windings
> Date: Saturday,August 09,1997 8:30 PM
> From: 	Kevin[SMTP:wawa-at-spectra-dot-net]
> Reply To: 	wawa-at-spectra-dot-net
> Sent: 	Saturday, August 09, 1997 5:15 PM
> To: 	Tesla List
> Subject: 	primary coil windings
> I don't think I understand what the differences of primary coil windings
> are besides their shape.  How does each one effect performance? Which is
> best?  I haven't made my coil yet, I'm still planning everything out. 
> Any info would be great.
> kevin