Re: Dual layer primaries

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>" <evp-at-pacbell-dot-net>

Tesla list wrote:
> 
> Original poster: "Barton B. Anderson by way of Terry Fritz
<twftesla-at-qwest-dot-net>" <tesla123-at-pacbell-dot-net>
> 
> Hi Jason,
> 
> Tesla list wrote:
> 
> > Original poster: "Jason Johnson by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <hvjjohnson13-at-hotmail-dot-com>
> >
> > Hello,
> >
> > Does anyone have any idea as to how to calculate inductance for a two level
> > primary? I'm talking about a primary coil that is wound with two layers
both
> > going the same direction and seperated by an inch or so, inner turns
> connected
> > together, and tapped in two places, one on the bottom half, one on the top
> > half. I know that I can't just calc. for one primary and then double it,
> > because the halves are going to have some mutual inductance, resulting in a
> > higher overall inductance than just doubling one of half the size, right?
> Does
> > anyone get what I'm talking abut here?

	The inductance should be somewhere between twice and four times that of
a single spiral; two times if they're widely separated and four times if
they are very closely spaced.

Ed