I'm trying to learn antenna matching and I'm as much a "do the math" guy as I am "hack it out through trial and error" kind of person. Usually it's both, when I'm not getting it. And I'm not getting tank circuits right and I dont have a large set of inductors to play with. Is there a chip that is a variable inductor with a digital interface? I should have just built the oatmeal container radio and moved on to motor controls.