Cecil Moore wrote:
Tom Donaly wrote:
Wrong. In the first place, you obviously don't know the criterion for
resonance. In the second place you just assume the number
90 without any reason. In the third place, the number 37
has only your assumption for the necessity of a 90 degree
phase shift to justify its existence. As I wrote before, this
is pretty poor shooting for a professional symbol slinger.

Tom, you obviously don't know what you are talking
about or how to do the analysis and are now just waving
your hands in emotional frustration.

The criterion for resonance is a 90 degree phase shift
end-to-end in the stub. MicroSmith and antenna analyzer
measurements verify the shortened stub is resonant at
the design frequency with the 100 ohm section of 10
degrees and the 600 ohm section a tad longer than 43
degrees. I have been designing these shortened dual-Z0
stubs for at least 20 years.

The larger question is: Why don't you know how to
verify or disprove my figures? Is this subject beyond
your engineering comprehension level?

I'm not an engineer, so I don't have an engineering
comprehension level. Secondly, you must have figured
this out with the aid of a Smith chart or you'd know
exactly how many degrees you need for your 600 ohm line.
Finally, if you don't know how to prove your own figures,
how do you expect me to be able to do it?
Do you know how to figure the other zeros in this line? Are
they the same as they would be in a quarter wave line with
identical Zo's?
73,
Tom Donaly, KA6RUH