Looking back in the archives, I've found quite a bit of information on what unintentional radiators need licensing and which don't. However, I've been asked to develop a product that will need to radiate intentionally, as it needs to use (several) low-power transmitters to transmit small amounts of data between 3 (and up) units. Of course, the data sent and received will be controlled by a PIC, probably a 12[CF] series. We're talking 3-5 bytes of data being sent, and most often sent every 5-10 minutes. The goal is a (low-quantity) production run (20-30 sets of units, each set being 3+ individual units), so I don't think I can get away without some sort of certification. I'm perusing the FCC rules (love the website, Harold!), but am wondering if anyone on the list has had to design and qualify a low-power transmitter. To get an idea of what I'm doing, I just need 100-200' line-of-sight in a (possibly) RF-rough environment: a theatre stage (think all those spotlights, wireless mikes, etc). If anyone has any personal experience to share, I'd appreciate it, including any recommendations/warnings about certain RF transceivers available for embedded designs. Thanks, John -- John Patrick -- N9OU Team Saber Competitive Robotics Web: http://www.teamsaber.com E-mail: teamsaber@teamsaber.com -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads