On 3/23/2011 1:30 PM, John Lemay wrote: > Yes, I can "home in" on the noise with great certainty !
That indicates that the noise is being radiated by the P3 or something attached to it, and picked up on your antenna (and not picked up on K3 wiring). The comments by others that ferrites on the power cable killed the noise suggest that that cable is doing the radiating. Now, I wouldn't rule out the coax as a radiator if someone has choked the power cable and still heard noise -- with RFI, always assume that there could be more than one coupling mechanism. Again, let me emphasize that a ferrite core is a low Q parallel resonant circuit. Most single #31 or #43 cores are, by virtue of their size and shape, cause a single turn to resonate close to 2M, while more turns move the resonance down to lower frequencies. This a problem on 2M is better solved with multiple cores rather than multiple turns, whereas problems on 6M are better solved with two turns and on the HF bands with more turns. 73, Jim K9YC ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
