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Old May 7th 09, 03:12 AM posted to rec.radio.amateur.antenna
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Posts: 274
Default Dual-Z0 Stubs

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
 
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