[Elecraft] OT: Effect of Compression and Expansion on the Inductance of Toroids?

[Leigh L Klotz, Jr.]

The toroid formulas are approximations, but good ones.  Here is a 
physics-based explanation that gives some of the complexities, but there 
are literally books on inductors.

http://tinyurl.com/9brxb

Leigh / WA5ZNU
On Mon, 29 Aug 2005 3:52 pm, Darrell Bellerive wrote:
> Well, it seems now that I am receiving contradictory information. 
> Specifically
> that compressing the turns on a toroid will raise the inductance.
>
> What is the real scoop. Does compressing or expanding the spacing of 
> the
> winding on a toroid change the inductance? Or just the distributed
> capacitance of the toroid? Or is this much more complex than I would 
> have
> expected?