>> snake oil > what ? I was trying to be funny about the device being illegal if it would really be known that it works. I still think that nobody hoped to obtain active amplification of a GHz signal using a mercury vapor lamp at room temperature. It may prove to be so, that a radar gun pointed at a fluorescent light with a spiral wire of the right pitch wound around it may indicate a speed where there would be no 'speed' at all, and that that speed may be set by changing the fluorescent driver's frequency. Sean Breheny wrote that the signal he gets from the fluorescent light with his Gunnplexer is several times stronger than the reflection from a car at the same distance (or did I read it wrong). Maybe if the fluorescent would have a wire wound on it to form a resonator/reflector at the Gunnplexer's frequency the echo and modulation would be even stronger. Peter -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.