It's amazing how many products cut tiny corners which end up resulting in a lot more EMI than would otherwise be necessary. One other phenomenon I've learned a

It's amazing how many products cut tiny corners which end up resulting in a lot more EMI than would otherwise be necessary. One other phenomenon I've learned about recently is that some switching power supplies can create all sorts of weird harmonics when in the presence of strong RF fields. Ideally you can test your device to eliminate such behavior even if its own generated emissions are to spec already.