From: Terence Gunderson > Before reinventing the wheel and going for FCC Type compliance (about > $10,000) > I would investigatye off the shelf solutions with type acceptance. > > http://www.linxtechnologies.com/main.html > I agree with not reinventing the wheel but Linx has always seemed too $$ to me. Couldn't you use: http://www.laipac.com/msg5.htm 315, 418 & 433.92Mhz 8mW $4.8 USD for each Tx or Rx. They also sell encoder/decoder chips which make it easier. Their datasheet is brief but shows circuit to make it work (worked for me). But, as I think about it, I don't think they come with an approval. But surely they've been down this road before and know how to handle the situation. And I bet it's hard to run a company selling modules that won't pass the rules. At any rate, my experience has been these are handy modules with which to link MCUs. Has anybody else used these? DScott -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.