In article , "Reg Edwards"
g4fgq,regp@ZZZbtinternet,com wrote:

"Jeff" wrote
Smith did not invent the Smith Chart. He simplified, for HF use
only,
charts which had been in existence since the Victorian Age, which
covered all transmission line frequenies down to telephone and
power
frequencies.


That is not quite correct, what Smith did was to take to concept of
the
pre-existing equations and a rectangular chart which covered a
limited range
of impedances and develop them into a circular, more complex chart,
that
covered a full range of impedances. See the Introduction to Smith's
book
"Electronic Applications of the Smith Chart".

Regards
Jeff
=========================================

Agreed. Your description of what Smith did is more accurate than
mine.
----
Reg.

Hello, and there appears to be faulty logic here. Any other form of chart
not in Smith's format or variants thereof (e.g. a Carter Chart) cannot be
a Smith Chart. The fact that Phillip Smith's and similar types of charts
are all based upon the transmission line equations is irrelevant to giving
due credit to their respective developers. Smith recognizes (pg xv, intro
to Smith's book) that similar charts (and their respective limitations)
formulated by others inspired him.

Do we say that since a couple of brothers from Dayton, Ohio leveraged
then-existing aviation technologies and ideas developed by others (e.g.
gliders) the Wrights shouldn't be given credit for inventing a successful
human carrying, heavier-than-air, propeller-driven aircraft?

And for the flip side, while many readily identify Marconi, DeForest, J.
Fleming and sometimes Tesla as radio pioneers how many can recall Edwin
Armstrong? Sincerely, and 73s from N4GGO,

John Wood (Code 5550) e-mail:
Naval Research Laboratory
4555 Overlook Avenue, SW
Washington, DC 20375-5337