> > The problem that is kicking my butt is contention. If two transmitters are > triggered simultaneously, no good can come. I though of using a "listen" Sounds like a game tracker. If that's the case, contention is of little concern in a real-world area unless you have a very large number of sensors. Andy ================================================================== Andy Kunz Life is what we do to prepare for Eternity ------------------------------------------------------------------ andy@rc-hydros.com http://www.rc-hydros.com - Race Boats andy@montanadesign.com http://www.montanadesign.com - Electronics ==================================================================