On Dec 6, 9:48 pm, Cecil Moore wrote:
So are we agreed that a 43.4 degree stub terminated in
0-j567 ohms impedance is electrically 1/4WL, i.e. 90
degrees long?

There are many ways to get the 0 input impedance:
- 43.4 degrees of 600 ohm line terminated in a lumped 0-j567 impedance
(assuming I recall the problem corrrectly and you did the math
correctly)
- 43.4 degrees of 600 ohm line followed by 46.6 degrees of 600 ohm
line, open at the end
- 43.4 degrees of 600 ohm line followed by 10 degrees (IIRC) of 100
ohm line, open at the end
- a short
- 180 degrees of any impedance line shorted at the end
- and many, many more

Are you claiming that all of these are electrically 1/4WL ?
Even the 180 degree line? And the short? Seems like a stretch.

And when looked at in detail (think time domain for moment), they each
behave quite differently.

....Keith