On Wed, 24 Oct 2007, Michel Jullian wrote: > Couldn't a "real" radio receiver be used to see if the lab receives > significant emissions at 18MHz?
Certainly! But seeing his LED results, the signal would have to be many watts per square meter, so it might overload a radio. A simple RF field-strength meter or amateur radio "sniffer" meter might be helpful, but it probably would be overloaded by the 50KW AM radio tower. > How has this freq been determined BTW, I thought the circuit didn't tolerate > probing? I don't recall what he said in earlier videos. But regardless, the LED chains should have a very strong RF e-field around them, and be easily detected by a floating oscilloscope probe held even several inches away. Turn the scope gain way up, of course. I STILL think that his local AM radio tower is very suspicious. All the theory, calculations, and attempted shielding is unconvincing. It's like trying to work with photodiodes under desert sun environment! Since there is no "nighttime conditions" where RF is concerned, he really needs to take the circuit far, far away from the AM tower and see if it still keeps working. That, or make absolutely certain that his LED ciruit's output signal is NOT NOT NOT synchronized to the AM signal's carrier. If it's in synch, then it's a harmonic, and the strong AM signal is almost certainly the energy source. (((((((((((((((((( ( ( ( ( (O) ) ) ) ) ))))))))))))))))))) William J. Beaty SCIENCE HOBBYIST website billb at amasci com http://amasci.com EE/programmer/sci-exhibits amateur science, hobby projects, sci fair Seattle, WA 425-222-5066 unusual phenomena, tesla coils, weird sci
