Keith Dysart wrote:
Which suggests that if there are two directions of rotation, phasors
don't help much with the solution.

By conventional definition, coherent phasors traveling
in opposite directions are rotating in different
directions, one clockwise and one counter-clockwise.

Adding a forward wave and a reflected wave of equal
amplitude results in:

E = Eot[sin(kx+wt) + sin(kx-wt)]

By convention, the forward +wt wave rotates counter-
clockwise as the angle increases in the + direction.

By convention, the reflected -wt wave rotates clockwise
as the angle increases in the - direction.

The standing wave equation becomes:

E(x,t) = 2*Eot*sin(kx)*cos(wt)

Which direction is the standing-wave phasor rotating?
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73, Cecil http://www.w5dxp.com