dansawyeror wrote:
Why are these different? What above is incorrect?

The horizontal center line on a Smith Chart is resistive.
The outside circle on a Smith Chart is reactive. A
capacitor is almost purely reactive. The reactance is
1/(2*pi*f*c) That value will always fall on the
outside circle of the Smith Chart. If the capacitor
has a reactance of 0-j50 ohms, it will be located on
the outside circle at the very bottom of the Smith
Chart normalized to a 0-j1.0 value.
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73, Cecil http://www.w5dxp.com