Went through this myself. S7 to S9 noise appeared out of nowhere and persistent almost 24 hours a day. I hunted for the source with no luck. Then it dawned on me the noise commenced while PECO (utility), Comcast and Verizon were doing "upgrades" in the neighborhood. All utilities are underground. PECO was convinced it wasn't them, but they sent someone out to check...No joy. However, when the upgrades were done (including the installation of new underground power lines and dog house transformers) the noise went away....Well kind of. The powerline noise was masking another noise source that was trashing everything from 80 up to 10m. This noise was about S5-7, but would cycle on an off....on for about 40 seconds, off for about 20 seconds then back on. At first I thought it was some appliance on a timer, but that didn't make much sense. Not a furnace either. Eventually tracked it down to my neighbor's sodium vapor flood lights. These lights are notorious for generating interference when they are on their last legs. Had the rig on and observed his light flickering (noise present), going off (noise gone) and then coming back on (noise returned). Neighbor would not replace it until it eventually craped out. In the meantime, I used a Timewave ANC-4 and made a noise antenna (after some experimentation) that reduced the noise to about S1.
Check the ARRL website as well as the eHAM Elmer forums. There is a link to a site with a dozen or more noise recordings that may be useful helping you narrow down the possible cause. Harry WE1X -- View this message in context: http://elecraft.365791.n2.nabble.com/RF-Noise-in-the-Neighborhood-tp5646779p5646937.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ 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
