Re: Current across the antenna loading coil - from scratch

Cecil Moore wrote:
w8ji@xxxxxxxxx wrote:

Current is by definition is the flow of charge.


And two equal EM waves flowing in opposite directions
in the same wire use the same charge carriers.

At points where those waves cause equal and opposite instantaneous current, the standing wave current hits zero (is at a node). At all other points, there is some net instantaneous current that is the superposition of the current caused by the two waves at that point and moment in time.

By definition and by physics, we cannot have charges flowing two
directions at once at one point.


A charge carrier cannot be moving in two directions at
the same time. Two currents can certainly exist in opposite
directions at the same time.

No. Current is the rate of charge movement. The charge cannot be moving two directions at a point.

That's what forward current
and reflected current is.

Those are forward and reverse waves, not forward and reverse currents. you are confusing the wave with the water.

If you want to deny the existence
of forward and reflected current, be my guest.

I deny it. There is only current at a point, just as there is only water jiggling around under a wave on the ocean.

This is precisely the current we would measure with a current meter
sampling the magnetic field, it is the current we would measure
sampling radiation, and it is the current that would determine phase of
the radiation or induction field.


Yes, but if it's phase is unchanging, which direction is
it flowing?

Phase doesn't indicate the direction charge is flowing (current is going). For both traveling waves and standing waves, charge sloshes back and forth with no average movement over a cycle. The phase of that movement just tells you how that sloshing is timed with respect to the phase reference. The only case where charge moves in one direction (unidirectional current) is DC.

When the forward current and reflected current
are of equal magnitudes, which direction is the phasor sum
of those two currents flowing?

As long as you refer to waves as current, you are never going to get it. Waves travel on current reversals, but he wave is not current.

(snip repetition)
.

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