Andrew, that's kind of what I was saying in the previous post. Interoperability with equipment designed for 921MHz isn't really an issue, as there isn't any of this equipment... hence the problem! What I'm saying is, as the voltage/system frequency of AU is the same as EU/UK, the equipment will work here (EU controllers and devices), we just need to break the law transmitting on the wrong frequency.... frankly I'm not concerned about that, the mindless stupidity of the Australian/NZ authorities choosing a different frequency and thus locking out all the EU equipment we could otherwise have made use of, deserves it!