I've just spent a few days learning all about Smith Charts and matching. I've got a NanoVNA and my friend has a long wire that won't tune on 80 meters. It turns

I've just spent a few days learning all about Smith Charts and matching. I've got a NanoVNA and my friend has a long wire that won't tune on 80 meters. It turns out that the extra 20 feet of coax that he added to move the tuner near the radio makes it impossible to match, because of the transformation of the load. It was frustrating, but I really learned quite a bit. Today I spent trying to understand exactly how a NanoVNA works internally. If I knew C better (or, actually, wasn't afraid of it), I'd dig into the source code. The circuit is pretty easy to grok.