Re: whats my coupling? (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Thu, 16 Aug 2007 23:28:54 -0500
From: resonance <resonance@xxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: whats my coupling? (fwd)



Coeff. of coupling is dependent only on the geometry of the two coils not on 
the power levels, break speed, or capacitance value.

You can measure coeff. of coupling with the "resistor" method listed in the 
archives --- very accurate, or haul your coil to our TeslaFest in Sept. and 
we will measure it for you using the resistor method.  I will also be doing 
a short 30 minute "training session" on JAVATC at the TeslaFest.

Also, JAVATC will give you near exact coeff. of coupling for your setup.

For a 6 inch dia. coil optimum coeff. of coupling would be in the range of 
0.12 to 0.14.  Racing sparks start at 0.18 or above.  With an inverted cone 
and 6 inch dia. sec coil you are, at present, overcoupled.  Spark output 
with increase if you go to a flat horizontal coil and set your k = 0.12 to 
0.14.  You can use a sig. gen and oscope to check the freq. side band 
separation.  Ideally, you want the side bands to disappear.

With a 6 inch coil I suspect you will find best output with your sec. coil 
elevated approx 2.5 to 3.25 inches above the horizontal plane of your flat 
primary.


Dr. Resonance

Resonance Research Corp.
www.resonanceresearch.com


----- Original Message ----- 
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Thursday, August 16, 2007 8:48 PM
Subject: whats my coupling? (fwd)


>
> ---------- Forwarded message ----------
> Date: Thu, 16 Aug 2007 20:56:07 -0400
> From: Scott Bogard <teslas-intern@xxxxxxxxxxx>
> To: tesla@xxxxxxxxxx
> Subject: whats my coupling?
>
> Hey guys.
>     For those of you who are fluent with the various design programs, I
> need to know where my optimum coupling is.  I have a 6-in PVC secondary, 
> 31
> inches wound, 22 AWG.  My top load (is this important?) is 2 toroids, the
> bottom is 7*24, the top is 12*36, one sits atop the other, and the bottom
> one is about 2.5-3 inches from the top winding.  My primary, is 1/4 in cu
> tubing, inverse cone (about 20 degrees) with an 8 in hole in the center,
> .75-in between turns (tapped at turn, um, I cannot remember, but I think 
> it
> is 7-8-ish).  My power supply is 4 MOTs, 8kV and estimated 225mA, tank
> capacitance is 81nf (again, I'm not sure if you need this information). 
> My
> secondary is stationary, but I can raise and lower my primary from .25-in
> below the bottom winding, to about a foot, I am working on a way to adjust
> my top load height.  Thanks.
> Scott Bogard.