Cecil Moore wrote:

Gene Fuller wrote:
There is no standard convention in the world of math, science, or
engineering that claims a sine wave reverses phase as its amplitude
ranges through positive and negative values.

Of course there is, Gene. There are only two possible directions of
travel for real current in a wire. Current is either flowing to the
right, zero degrees by convention, or to the left, 180 degrees by
convention. Those are the only two directions possible for the real
part of Imax*e^jwt. The real part of the current has only two phases,
either zero degrees or 180 degrees. Any magnitude of real current
flowing to the right is at zero degrees, by convention. Any magnitude
of current flowing to the left is at 180 degrees, by convention. The
phase of current flow in a wire looks like a digital signal with only
two states possible.

Yikes, Cecil. Using that logic, you're basically arguing that every 1/2
WL or 180 degrees, a forward wave turns into a reflected wave. You
oughta think about what Gene's saying a little longer. Phase is the wt
part of the equation, and it varies continuously with time. It doesn't
change abruptly - unless it encounters a discontinuity of one sort or
another.

73, Jim AC6XG








Dang, you guys have really been seduced by your math models. RF current
reverses directions by 180 degrees every 1/2 cycle. In a transmission
line that is multiple wavelengths long, all up and down the same wire,
you have current flowing outward and current flowing inward 1/2WL apart.
Just because you hang an arrow on the direction of current flow
in an AC situation, doesn't mean the AC current always flows in that
direction. That is only a reference corresponding to t=0.
At t=(0+1/2 cycle), the current is flowing in the *opposite* direction
to the arrow.
--
73, Cecil http://www.qsl.net/w5dxp

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