Further update on this issue, I've had a bit of correspondence with them, but they are 'fighting' it. Latest comment from them is that "ETSI standard mentions when you use DFS and those ranges you need to use the Radar-detect. Radar detect is happening only for 1 minute." The line they are taking is that since our LIPD class license specification says that DFS must be enabled for the sub 5785 channels, then radar detect must also be enabled. I've been trying to pore through all the relevant ACMA documentation so that I can find some definitive paragraph that clarifies the situation, but so far have drawn a blank. I need someone who has some specific familiarity with the relevant rules and standard that can find something that will convince them to turn it off - any takers? :-} Cheers, Mike.