Thank you very much Martin for taking the time. Your last post makes sense to me.
I was having a hard time with the second half of this sentence:
"You cannot produce a half wave resonance and the output will never be in phase with the driver output. "
But this from your last post makes sense to me:
"At 100 Hz – the driver and terminus are now in phase."
So at 100 Hz (where the line length is equal to 1/2 wavelength) there is NO standing wave resonance, BUT the outputs from the driver and terminus are IN PHASE.
Have I finally got that right?
And "At 200 Hz – the driver and terminus are now out of phase." (But there is no standing wave resonance.) So IN THEORY at least, assuming a lightly-damped line, couldn't we get a cancellation notch in the summed response in that region?
Duke