Cecil Moore wrote:
It does not seem to be a concept that is
particularly useful for the solving of problems.

Looks like you haven't thought it through. If one
wants to create a shortened dual-Z0 stub with
equal lengths of each section of Z0High and Z0Low,
here is the corresponding chart for different
ratios of Z0High/Z0Low.

http://www.w5dxp.com/DualZ0.gif

As an example, one can create an electrical 1/4WL
stub that is 1/3 the normal physical length by
using 600 ohm line and 50 ohm line.

Cecil,

So how do you make that 12:1 connection, say 50 ohm coax to 600 ohm open
line? Do you s'pose the connection bits add any phase shift all by
themselves? Do you have a model for that extra phase shift?

8-)

73,
Gene
W4SZ