Dr. Slick wrote:

From Pozar's Microwave Engineering (Pg. 606):

Reflection Coefficient looking into load = (Zl-Zo)/(Zl+Zo)

Where Zl is a purely real load impedance, and Zo is the
purely real characteristic impedance reference.

When you change Zo, you change the normalized center of the
Smith Chart, and therefore the Reflection Coefficient and SWR, looking
into the same load.

Correct! What Roy is objecting to is the wording of an assertion of
yours that seemed to imply that changing the reference Z0 on a piece
of Smith Chart paper magically changes the physical Z0 of the transmission
line to a different value. As you have advised me, be careful of what you
say and how you say it.

I referred to "free space" the other day. The image I had in my own
mind was the free space halfway between here and Alpha Centauri. Others
had the image of "free space" as 0.001 WL away from a radiating antenna.
--
73, Cecil http://www.qsl.net/w5dxp



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