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Old March 11th 06, 04:52 AM posted to rec.radio.amateur.antenna
Cecil Moore
 
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Default Current through coils

Richard Harrison wrote:

Tom, W8JI wrote:
"You have consistently disagreed with me when I said the time delay
through an inductor with tight mutual coupling from turn to turn is
somewhat close to light speed over the physical length of the inductor,
rather than the time it rakes to wind its way around the copper."

That contradicts established experience.


Tom seems to be confusing the effects of the E-field with the
effects of the H-field. The E-field propagates at the speed
of light through a coil. The H-field propagates at the
speed of light through a capacitor.

Make
the turns coupling as tight as you can, the current is still delayed by
90-degrees.


Can the actual current phase delay be estimated knowing the Q
of the coil? I don't recall a formula for that.

Now, it surely is possible to bypass a perfect inductor with a capacitor
to mitigate a delay.


Dang Richard, now you've told Tom how to run his experiment
in order to obtain the results he predicts. :-)
--
73, Cecil http://www.qsl.net/w5dxp
 
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