Gene Fuller wrote:
Try writing the appropriate equations for your puzzler, in steady state
conditions, and then figure out where to insert the transient behavior.

I have already provided the equations, Gene. In a one second long
lossless transmission line, 200 watts of forward power equals 200
joules of energy in the forward wave. 100 watts of reflected power
equals 100 joules in the reflected wave. Total joules in the
transmission line equals 200 + 100 = 300 joules. The equations
are trivial.
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73, Cecil, W5DXP