I need to plot a few stability circles on a smith chart to make sure this basic RF amp example design will be stable. The problem is, the center of one of the circles is WAY off the smith chart, by 10 units actually. If I wanted to graph it how I know, I would need a meter stick. I'm thinking of printing a smaller version a the smith chart to accommodate but I think I would lose a lot of accuracy. The radius is 10.3 (or something near there) so it puts part of the circle back on the chart. Is there a better way to plot the circle? My current method, let me explain, is to take the reflection coefficient length I get from the bottom of the smith chart and drawing a line that long in whatever direction. Then I use a compass to draw the circle itself. This would work for the maximum length of the compass, which as for most compasses isn't very wide, and certainly not almost 80cm, the radius of this circle on my smith chart. I know software would do the trick for me, but I haven't needed it yet. There's something natural and rewarding about not using software, like comparing myself to engineers of the past who didn't have it . The question: how do I plot circles on a smith chart if the circle's center is very far away from the center of the smith chart without resorting to software?