That looks like Plasma TV noise to me Fred. It's very, very broad band since it's basically just arc-generated RF noise from each pixel radiated through the TV screen. The level and distribution across the RF spectrum varies according to the information being displayed on the TV.
Some have asked if it "tunes". If you have a bad I.F. cable between the K3 and P3, it may well pick up more of the noise than your antenna, so that's a good place to start. You might knock it down a lot if that cable has a defective ground. 73 Ron AC7AC -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Fred Jensen Sent: Tuesday, April 30, 2013 7:45 PM To: Elecraft Reflector Subject: [Elecraft] P3 Noise signature OK, I think I posted the screen shots at www.foothill.net/~andreaj/QRN.html I think the capitalization may be important. For all who replied, this is external noise, it appears instantaneously, usually not on weekdays during the day, sometimes on weekends earlier, and usually around 1600-1700 local. The big peaks drift slowly, often stop and are steady. There's a harmonic pattern to it, a wide fundamental, and increasingly narrow and closer spaced "harmonics". It's now 1945 local, and the P3 trace is below the baseline again. The noise may have continued to move up in frequency, or gone away. If it one of my neighbors' TV's, they must go to bed fairly early. :-)) 73, Fred K6DGW - Northern California Contest Club - CU in the 2013 Cal QSO Party 5-6 Oct 2013 - www.cqp.org ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[email protected] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
