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1. [RFI] Dancing Carriers (score: 1): Author: <alex@kr1st.com>; Date: Mon, 19 Dec 2022 14:57:22 -0500; Hi there, I'm trying to figure out what is generating these "dancing carriers" on 2m: https://youtu.be/gKA0P2c-034 I see them om on 6m and 1.25m as well. Has anyone come across this before and can sh; /archives//html/RFI/2022-12/msg00058.html (7,478 bytes)
2. Re: [RFI] Dancing Carriers (score: 1): Author: Michael Carter <Mike.Carter@unh.edu>; Date: Mon, 19 Dec 2022 20:30:38 +0000; I have not seen this type of spectrum in the wild, Alex, but the stepped frequency dithering of each 'carrier' component in the spectrum suggests an SMPS which is inadvertently modulating an RF carri; /archives//html/RFI/2022-12/msg00059.html (10,473 bytes)
3. Re: [RFI] Dancing Carriers (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Mon, 19 Dec 2022 16:04:51 -0500; Signals like that which move up and down are generally something like harmonics of switching power supply or variable speed motor or some other non locked frequency digital system, that is, something; /archives//html/RFI/2022-12/msg00060.html (8,717 bytes)
4. Re: [RFI] Dancing Carriers (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 19 Dec 2022 15:27:20 -0800; On 12/19/2022 1:04 PM, k1ttt.dave@gmail.com wrote: Signals like that which move up and down are generally something like harmonics of switching power supply or variable speed motor or some other non; /archives//html/RFI/2022-12/msg00061.html (8,039 bytes)
5. Re: [RFI] Dancing Carriers (score: 1): Author: Michael Carter <Mike.Carter@unh.edu>; Date: Tue, 20 Dec 2022 01:17:51 +0000; Agreed, David (K1TTT) - the step frequency variation could readily be due to the FFT computation interval while the frequency wobble of the spectral lines occurs continuously because of drift in the; /archives//html/RFI/2022-12/msg00062.html (13,885 bytes)
6. Re: [RFI] Dancing Carriers (score: 1): Author: Lloyd Berg <lloyd.n9lb@gmail.com>; Date: Mon, 19 Dec 2022 20:20:53 -0600; Possibly a fancy automated holiday light display in your home or neighborhood that is powered by switching mode power supplies? _______________________________________________ RFI mailing list RFI@co; /archives//html/RFI/2022-12/msg00063.html (8,499 bytes)
7. Re: [RFI] Dancing Carriers (score: 1): Author: <alex@kr1st.com>; Date: Mon, 19 Dec 2022 22:00:24 -0500; Thanks everyone for taking an interest! I know what a SMPS sounds and looks like. In fact, I have one in the shack that I can hear if I take the common mode chokes off it. It will wander up and down; /archives//html/RFI/2022-12/msg00064.html (18,674 bytes)
8. Re: [RFI] Dancing Carriers (score: 1): Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>; Date: Tue, 20 Dec 2022 12:24:00 +0000; Switchers generally exhibit a few characteristics: o They are generally somewhat unstable, with their free-running frequencies changing with temperature, load and supply voltage. o They typically gen; /archives//html/RFI/2022-12/msg00065.html (20,907 bytes)
9. Re: [RFI] Dancing Carriers (score: 1): Author: "Dave (NK7Z)" <dave@nk7z.net>; Date: Tue, 20 Dec 2022 05:13:46 -0800; Hi, I have a couple of RFI movies, showing a grow light startup, and operation, on 40, and 30 meters, across a 24 hour period located at: https://www.nk7z.net/rfi-site-survey-part-ii-interpretation/; /archives//html/RFI/2022-12/msg00066.html (22,628 bytes)
10. Re: [RFI] Dancing Carriers (score: 1): Author: <alex@kr1st.com>; Date: Tue, 20 Dec 2022 10:07:01 -0500; Thanks for the article, Ed! Its a good reminder to properly investigate possible noise sources, or at least where it is coming from, before drawing any conclusions. I did get rid of the Shootzu LED b; /archives//html/RFI/2022-12/msg00068.html (26,968 bytes)
11. Re: [RFI] Dancing Carriers (score: 1): Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>; Date: Tue, 20 Dec 2022 16:00:47 +0000; We get that all the time and even if we were to say that it's a Shootzu LED bulb, the ham would ask: Where is it? ________________________________ From: alex@kr1st.com <alex@kr1st.com> Sent: Tuesday,; /archives//html/RFI/2022-12/msg00069.html (27,632 bytes)

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