Hello all, https://www.edn.com/how-cops-are-finding-grow-ops-with-am-radios/
The above is a link to an article in the EDN magazine (a technical journal primarily aimed at EEs). The article is more than five years old, but maybe it is only recently this type of interference has started to show up in upstate New York. I have one of these noise sources somewhere in my neighborhood (itβs not that easy to pinpoint due to the low frequency). I know this is OT and maybe somewhat controversial, but this type of strong interference is of great concern to the amateur radio community. I am not after anybody in my neighborhood getting arrested, but I very much want to see the interference stop. Even if the operation is legal, the emission is definitely way outside FCC part 15 limits. Quote from the article: β..conducted emission data clearly shows peaks as high as 100+ dBuV (50 dB over the limit) in the range 6 to 8 MHz, with lower peaks at 14, 18, and 21 MHz.β My interference is primarily in the 7MHz band. 14 MHz is virtually free of it. See here for a screenshot: http://www.ab2tc.com/growlights.png There are three peaks, approximately 49 to 50kHz apart. The center one is centered under the cross hair cursor. As you can see, the band is starting to come to life at about 2:30 in the afternoon. The interference is on 24/7 as far as I can tell. Does anybody have any experiences like this and/or any suggestions what to do? If you want to keep this confidential, E-mail me privately. My E-mail address is OK on qrz.com. AB2TC β Knut PS. I have previously reported power line noise to the electrical company and have had positive responses (fixes) from them. I suspect that this kind of interference is not easily detectable on their UHF based sniffers; besides I am not sure if conducted interference from residences lies under their jurisdiction (there are only residences here for many blocks). -- Sent from: http://elecraft.365791.n2.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 Message delivered to [email protected]
