[Elecraft] RE: OT: Effect of Compression andExpansiononthe Inductance of Toroids?

[Jim Brown]

I disagree. I think you are probably observing the change in capacitance. I 
agree that the higher frequency components associated with the square wave 
rise time is the measurement excitation. 

Jim

On Tue, 30 Aug 2005 10:00:23 -0700, Ron D'Eau Claire wrote:

>Jim wrote:

>Yes, if the measurement is made at a sufficiently low frequency, Xc is 
>insignificantly low. 

>---------------------------

>The measurement is made at H.F. I'm sorry, I apparently confused the issue
>by saying the applied square wave was at 60 kHz. That's NOT the measurement
>frequency. The edges of the square wave include components extending through
>the H.F. range, at least. The inductance is measured directly by noting the
>effect it has on the edges of the square wave.

>The advantage of that system is that it measures the inductance directly.
>And a shift in the inductance of about 9% was observed by scrunching the
>turns together.

>Ron AC7AC