Yesterday I heard a faint "hum" in my shack but all of my gear was off. It sounded like possibly a fan running or power supply noise. I did a very scientific test of the sound source by putting my ear to each piece of equipment in my shack and soon found that the noise was coming from my KPA500! The amplifier was off but was still connected to the shack ac power. I then removed the power cord from the KPA500 and the noise disappeared. Does anyone have any idea how this could happen?
By way of further background, I have been dealing with QRN from a recently installed solar system. I have traced the source of that noise to the solar system by confirming that the QRN goes away when the solar system is turned off while running my K3s on battery power. If I had to venture a guess, I would say that somehow the unpowered KPA500 was picking up noise on the shack wiring. Very strange. Is that possible?? Dick, WM6G ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
