Yeah they have for many years now, e.g. one of the more popular vendors is Futaba: http://www.futabarc.com/technology/fhss.html http://www.futabarc.com/technolo

Yeah they have for many years now, e.g. one of the more popular vendors is Futaba: http://www.futabarc.com/technology/fhss.html http://www.futabarc.com/technology/fhss.html But others use similar.