Richard Clark wrote:
Thank you. I see that for the 50 Ohm load that the line exhibits a
characteristic of 50 Ohms as described by its concentricity about the
reference.

This is no surprise given the cable is premium short run (length, not
reels) material specified out to 20 GHz (from Boeing's precision
electronics facilities). I have several hundred feet brand new.

Please plot your data on a Smith Chart. Since your data is
obviously nonlinear, I would suggest diagnosing the nonlinearity
problem before concluding anything. For instance, what is the
one tenth scale RF RMS voltage before it is rectified by the
diode?
--
73, Cecil http://www.qsl.net/w5dxp



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