John KD5YI wrote:

"Cecil Moore" wrote in message
...
John KD5YI wrote:
I think any inductor with the same inductance, Q, and self-resonant
frequency will give the same velocity factor and delay as your
Bugcatcher.

That may or may not be true - I don't have an
opinion one way or another - and it is NOT part
of my argument. My argument deals only with
75m Texas Bugcatcher coils and other large air-
core loading coils used on 75m.

If it IS true, then the point I tried to make that you are making a
distributed component from a lumped one is valid. That's what caused me
to object to your earlier post.

And, by the way, I feel the same way you do except about people who are
afraid to consider lumped components. Perhaps they do not have what it
takes to judge when a proper substitution can be made.

John

Anyone can take a small inductor, such as Roy described, and try to
analyze all the currents and such in it using a distributed model at low
or moderate frequencies. If they do, though, they'll just come up with
what they'd have come up with treating their small inductor as a
lumped element. Cecil has distributed elements on the brain. It's what
comes of falling in love with your own theories.
73,
Tom Donaly, KA6RUH

Tom Donaly wrote:
Anyone can take a small inductor, such as Roy described, and try to
analyze all the currents and such in it using a distributed model at low
or moderate frequencies. If they do, though, they'll just come up with
what they'd have come up with treating their small inductor as a
lumped element.

One wonders why some people insist on a "small
toroidal inductor" which obviously agrees with
the lumped-circuit model instead of analyzing
a 75m Texas Bugcatcher loading coil which just
as obviously violates the presuppositions of
the lumped-circuit model.

Instead of the "small toroidal inductor", let's
discuss w8ji's 100 turn, 2" diameter, 10 inch
long air-core coil through which he measured that
ridiculous 3 nS delay after which w7el posted some
"agreeing measurements" while asserting that the
electrical length of the coil was 33 degrees.

Does anyone else realize that 33 degrees in 3 nS
at 4 MHz is faster than light speed?

Are you guys so afraid of losing face that you
are willing to post technical falsehoods?
--
73, Cecil, IEEE, OOTC, http://www.w5dxp.com