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Traditionally we now convert to admittances. This is not strictly
necessary, but it is easier to understand on the graph. Just add
a X/Y-component. Note that we now are on a real g=1 circle.
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A parallel capacitor will move the impedance to the chart center.
A good starting value - 20 pF (say, about 10 times the wavelength
in meters).
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Again some experimenting, 22 pF gets us very near the center.
Mind that it is necessary to first select the component before
moving the scrollbars, inputting a new value, or changing the
component. Each click on the component line in the list will
re-center the scrollbar.
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On the numerical page ('log'), we see that the final impedance of
our exercise was 50.6 + 0.1j, corresponding to an SWR of 1.02...
Quite good, isn't it?
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