[TCML] K-value? - was: New pic of 60ma coil with suggestions applied

["Stephen J. Hobley" <shobley@xxxxxxxxxx>]

I don't know how to determine/calculate a K value of a coil - is there a reference somewhere?

Thanks,
Steve


-----Original Message-----
From: tesla-bounces@xxxxxxxxxx on behalf of DC Cox
Sent: Sun 9/28/2008 7:45 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] New pic of 60ma coil with suggestions applied
 
Overcoupling is the usual suspect for racing sparks.  Keep your k value in
the range of 0.10 to 0.14 for most spark excited coils for good performance
without racing sparks.  Also sometimes caused by standing waves due to poor
quenching.   This is true especially if your toroid size is
less than 2 x sec coilform dia.

Be careful if you increase coupling too tight as this may put you back in
racing spark land.

Dr. Resonance




On Sun, Sep 28, 2008 at 10:41 AM, Stephen J. Hobley <shobley@xxxxxxxxxx>wrote:

> New one:
>
> http://www.stephenhobley.com/60ma_2.jpg
>
> Old one is here:
>
> http://www.stephenhobley.com/60ma_coil_1.jpg
>
> This is with all suggestions applied - I moved the strike rail, loosened
> the coupling and applied 6 coats of varnish to the secondary.
>
> No more racing sparks. I'm going to increase coupling and see what
> happens.
>
> Steve
>
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