开云体育

Thank you Victor
Hi there

I did well to tell you clearly what I did not understand. Our linguistic difference plus character encoding problems had greatly scrambled the transmission. The ? which had been transformed into mu was formidable.

The ""S11 R/Ω & X/Ω"" is what is written on the graph of nanovna-saver

In summary what I understood:

From S11, nanovna-saver calculation Z

When you write Z'=Z/ω you are using the real Z or the reduced z=Z/Zc where Zc is the normalization impedance (50 ?).

Then nanovna-saver draws the graph of Z' as a function of F= ω/2π by separating the real part from the imaginary part.

I do some development in C#. I wrote a grinder to, from a CSV, draw a graph in a .DXF The grinder was in fact to make topographic plotting. These .DXF (like .DWG but ASCII) I manipulate them with nanoCAD, a version of which is free. It turns out that in the Smith chart the rectangular coordinates of the chart (horizontal and vertical) are the coordinates of S11 (the normalized reflection coefficient with respect to Zc). I have a Smith chart in bitmap as well as a vectorized chart in my .DXF and I can superimpose quite easily:
-Theoretical curves, derived from calculations
-Measurements, by processing nanovna-saver .S1P files

It is with sed I transform the .S1P into .CSV I can control this .CSV in Excel and do calculations on it. It is a very powerful aid.

73 QRO
--
F1AMM Fran?ois