Hi all, doing a project at the moment using low power 433MHz transmitters and in the search for the most robust format I can get. Data overheads not really a problem and speed is also not a concern. At present I am using manchester encoding at 1000bps and it seems quite good. What other schemes would people recommend I trial? Regards and happy holiday season :) Peter Mcalpine -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.