Roy Lewallen wrote:
With only one adjustable element, you can get a
specific R, say, or X, but not both.

With only one adjustable element, i.e. ladder-line length,
I get X=0 and 35 R 85 ohms which is close enough to
50 ohms for most of us non-perfectionists.

http://www.w5dxp.com/notuner.htm
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73, Cecil http://www.w5dxp.com