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A Smith charting program. You can enter either discrete components or transmission lines, see the results on screen and/or generate Postscript output. Component values can be changed numerically or using scrollbars.
This is a small program to show impedances in a SmithChart. The chart is drawn (it is not an image), so it can be redimensioned without pixeling. As it's done with Qt 4, it should run in multiple platforms.