How may radios do you own? Forget the AM/FM, GMRS/FRS radios you listen to or communicate with. We’re talking about the multiple radios and antennas in your phone, your TV, your car, your garage door ...

I want to get just a little technical this week and talk about how radios work. I’m going to avoid the detailed, low-level engineering stuff, apart from saying that designing radios is at least as ...