I'm not an engineer and I figured an EE would be able to help me on this problem. I have a garage door opener that has lost its range due to RI. I've tried everything from powering down my entire house, replacing the mother board, and the remotes and nothing works. I've worked with the manufacturer with no results and there has got to be a answer beside switching to 315 and buying all new remotes and a receiver. Please help. Can I buy something to find out where the RI is coming from, kinda like a metal detector for RI on this frequency? This is what I've found and other than this I'm stumped. "Fine the lines coming into the control head from the manual doorbell switch and the electric eye sensors. You must filter these at the control head by either soldering series inductors in each line to choke the RF or by winding these lines around ferrite toroids. You may also want to try a simpler solution: Place a .01 mf cap cap across the leads at the terminal strip on the main unit."