In article , Bill Turner
writes:

On Sun, 07 Dec 2003 13:55:35 +0200, Paul Keinanen
wrote:

One can still argue that the inductance and inductive reactance are as
well as the capacitance and the capacitive reactance are still there
as separate entities, but we can not measure them separately from
terminals of the coil. Thus, this is an artefact of the measurement
method.

Not only can you *not* measure them separately, they can not be
physically separated either, since the parasitic capacitance is always
present between adjacent windings. I would not call it an artifact of
the measurement method, but rather an artifact of the coil itself.

Nonsense. General Radio had a nice little formula way back
before 1956 for finding the distributed capacity of an inductor.
It was published in the Green Bible (ITT Reference Data for
Radio Engineers, small format, dark green hard cover). I used it
years ago and earlier this year and many times between.

Write on the whiteboard 100 times: Inductance does not change
with frequency...reactance changes with frequency.

Now if someone actually wants to WIND COILS, I have a little aid
for tiny ones wound on common screw thread forms that was
published in Ham Radio magazine. Has measured Qs over
frequency as well as basic inductance. I'll attach it to private e-mail
(PDF) to anyone that requests it.

Using common screw thread formers and solid wire allows a good
repeatability between bench and application. Forms can be anything
from a 4-40 bolt to a common screw-thread lamp base.

Folks in here are getting too wound up...and coiling to strike. :-)

Len Anderson
retired (from regular hours) electronic engineer person