Re: Four Layer Coil

Subject:  Re: Four Layer Coil
  Date:   Sun, 15 Jun 1997 22:38:55 +0500
  From:   "Alfred A. Skrocki" <alfred.skrocki-at-cybernetworking-dot-com>
    To:   Tesla List <tesla-at-pupman-dot-com>

On Sun, 15 Jun 1997 16:39:48 -0500 Robert W. Stephens
<rwstephens-at-headwaters-dot-com> wrote;

> > It would see to me that placing the layers in parallel you would be 
> > decreasing the inductance, ie.
> > 
> >  Total I = 1 / (1/Ifirstlayer) + (1/Isecondlayer)...+(1/Inthlayer)
> > 
> > Are you saying that even though it reduces the inductance it is still 
> > a gain over using the equivelent larger gauge wire?

> Alfred,All,
> Bert Pool's scheme of winding additional layers of secondary, 
> precisely over the first one laid down does NOT reduce the inductance 
> because the additional wire is continuously and mutually enveloped in
> the magnetic field of the original coil.
> If these were separated single layer solenoids connected in parallel
> then yes, the result would be reduced inductance. 

About 6 hours after I posted that message I realized exactly what 
your saying! I got too focused on the parallel windings to step back 
and realize thay were all in the same magnetic field!
> Bert's scheme is like winding rectangular wire on edge 
> to give greater copper cross section without changing the 
> turn-to-turn spacing.  In this manner he maintains high inductance.
> His technique is actually superior to a single 
> rectangular wire however because splitting the cross section over 
> several conductors acts like Litz wire, increasing the available skin 
> area, and thusly giving lower total RF resistance to the coil.

Yes, it seems he has definetely improved the art of secondary 
construction with this idea of his!

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