Keith Dysart wrote:
But the rules for black boxes do not allow measurements
on the inside. This is how they help clarify the thinking.

I've not disagreed about anything happening outside
the black boxes. I am only interested in what is
happening inside so I am getting rid of the black
boxes. They are a silly unnecessary handicap.

since the problem can be solved without the information.

You haven't solved the problem yet with no black box.

--43.4 deg 600 ohm line--+--10 deg 100 ohm line--open
Vfor1--|--Vfor2

What is the phase shift between Vfor1 and Vfor2? I
solved it for you already.
--
73, Cecil http://www.w5dxp.com