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Old April 8th 06, 02:50 PM posted to rec.radio.amateur.antenna
 
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Default Current across the antenna loading coil - from scratch


Dave wrote:
thats the basic problem in this whole discussion. you are all talking about
the same thing, just using different notation and incomplete statements so
that none of you understands exactly what the others are trying to talk
about... when really you are all saying the same thing. its kind of like
after i graduated from college with an ee degree and my sister graduated
from an air force basic electronics course, she tried to ask me something
about currents in a transistor and i saw it all backwards... well of course
she was talking electron flow and i was talking hole flow. we both got the
same result but the notation was all different.


That's not true at all Dave. Most of us know that current is current.
It really only flows one direction at any instant of time. We can
indeed consider systems as having current that flows two directions at
one instant of time, but the results of that better agree with the
actual real current that flows only in one direction at any instant of
time or they are wrong.

Also, behavior of basic components cannot change. A two terminal device
like a loading coil cannot have differences in the current flowing
through it at each terminal without a third path. (I assume we all
know current is not an across vector and it does not "drop", the person
who started this thread just used poor wording.)

I think the basic problem is Cecil wants to used some definition of
current that does not allow models to be freely exchanged and does not
produce results that match real world systems. It always has to match.
We can't have different results unless someone has an error.

The only reason I'm skimming the posts here and making the occasional
comment is I hate to see people trying to understand how this stuff
works be confused. The real fuss is a couple people seem to think
standing waves or "missing antenna length" are the root cause of
current being different in the two terminal component called a loading
coil.

It really isn't an argument or debate as much as trying to help lurkers
understand how the system really works, and not let them fall into the
trap that the loading coil behavior is any different than any other
coil, the only possible reason for differences in current at each
terminal is stray capacitance allowing displacement currents to the
outside world, and that any phase differences in current at each coil
terminal are also tied to capacitance from the coil to the world around
the coil.

It's not correct to assume people are talking about the same result
different ways, because both Cecil and Yuri have huge flaws in their
conclusions. They both seem to want the inductor to behave in some very
unique way just because it is an antenna, and the reults they seem to
claim do not match actual measurements. Cecil dismisses real
measurements with frantic arm waving about reflected and forward
current and no one being able to measure current and phase because of
standing waves, and while I think Yuri would accept measurements he
won't accept them when made by others and won't make them himself.

This has gone on for perhaps three years now. It is really up to Cecil
and Yuri to let it go, since they are the ones who seem to disagree
with measurements and accepted theory.

73 Tom