[wfunction]

> "Military-grade" systems use complicated techniques like frequency-hopping spread spectrum

Note that that technology has been around since World War II. And fun fact, while we're on that topic, this page is worth a read: https://en.wikipedia.org/wiki/Hedy_Lamarr

[tjl]

I love that a technique that's so widely used now was the co-invented by a movie star. It's also used in cell phones.