Ian White, G3SEK wrote:

Cecil Moore wrote:
Ian, please take your own advice. It's pretty obvious that you are
thinking about an IDEAL INDUCTANCE in terms of a lumped circuit analysis
which is invalid when analyzing a STANDING-WAVE ANTENNA.

It makes life easier to compartmentalize your scientific world-view in
that way.... but it is deeply, fundamentally wrong.

Would you mind providing some real-world proof of your argument or
are you satisfied just to play games in your mind?

In reality, all true scientific knowledge joins up seamlessly - that's
how we *know* it's true! If we can't see how it joins up, that means we
still have work to do. Dividing it into compartments that don't join up
is lazy and will always lead you false.

Most of our models involve shortcuts. For instance, the shortcut equations
for small loops do NOT work for large loops. Your lumped circuit shortcuts
don't work for distributed networks. When anything in the circuit is an
appreciable percentage of a wavelength, the lumped circuit model doesn't
work. That's why the distributed network model was invented.

A fundamental physical property like inductance doesn't change its
behaviour depending on the situation it finds itself in. If you cut the
antenna wire and insert an ideal, lumped inductance, that inductance
will behave in exactly the same way as it does in any other circuit.

It won't behave at all in reality because an ideal, lumped inductance exists
only in the human mind, not in reality. If you want to play mind games, be
my guest, but please don't try to pass your mental musings off as reality.

The question is not whether your mental current changes through an ideal,
lumped inductance existing only in your mind. The question is whether the
current changes through a real-world bugcatcher coil that exists in reality.

If you really looked hard at the math of antennas considered as
transmission lines, you would find there is no problem whatever about
inserting an ideal inductance, with no difference in current between its
two terminals.

An ideal inductance doesn't exist in reality so you are just playing
games in your mind. Every real-world coil has a phase shift, i.e. a
delay. A phase shift is all that is required for the superposed
currents at each end of the coil to be different from each other.

You seem to be saying that the phases of the forward and reflected
currents don't change through a one-foot diameter, one-foot long bugcatcher
coil made from 60 feet of wire? All I can say is, "Get real!"
--
73, Cecil http://www.qsl.net/w5dxp


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