"Cecil Moore" wrote
If forward and reverse waves do not exist separately,
how is it possible for a circulator to separate them?

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Cec,

You forgot to allow TIME into the argument.

The two waves do NOT, and cannot, exist seperately in time.

The circulator merely divides the STEADY STATE, instantaneous, at the
same time, power in the wave into two parts according to what the
operator, or by design, has set it to do.

When the generator is switched off both parts disappear
simultaneously.

I know this won't satisfy you.
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Reg.