Thanks all for you input and recommendations, helped me submit an "Intruder report" to DARC.
I do not think the source is local (power supply, solar systems, Etc.) It's very strong 20+ over S9 and 20 Khz wide, comes and goes at odd times. Best guess is an HF radar. Ron ------------------------------ Message: 20 Date: Tue, 19 Apr 2022 20:17:10 +0000 From: Michael Carter <mike.car...@unh.edu> To: Elecraft Reflector Reflector <Elecraft@mailman.qth.net> Subject: Re: [Elecraft] Interference on 17M Message-ID: <bl3p223mb0385549e2bc2f0f23ae6970fe4...@bl3p223mb0385.namp223.prod.OUTLOOK.C OM> Content-Type: text/plain; charset="iso-8859-1" William, I suspect you had an attachment stripped by the reflector. Was it a sound file or spectrum view? Ron, does the RFI occur only on 17M? I presume you've checked other bands? The switch-mode power conversion in PV inverters can generate RFI across a broad spectrum, but it would be unusual to have an isolated spectral peak, even line-broadened, at one discrete frequency in the 18 MHz range. The switching frequencies in power converters are typically much lower. The harmonics of the switching frequency could appear in the 17M band, but those would be weak relative to the fundamental in the few hundred kHz to perhaps 2 MHz range. Ron, do you have HF portable RX capability, even if only temporarily in your car? Some phone calls or emails to other hams in your community would help with local RFI checks. Keep us posted! 73, Mike, K8CN ______________________________________________________________ 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