- 1. [RFI] Does anyone recognize this RFI? (score: 1)
- Author: Matt Foster <wedgef5@gmail.com>
- Date: Wed, 15 Apr 2020 10:11:52 -0500
- The linked image shows interference that, as far as I know, is always present for me on 15m. Im talking primarily about what is appearing between about 1400 and 2100 on the waterfall. If you look clo
- /archives//html/RFI/2020-04/msg00023.html (7,063 bytes)
- 2. Re: [RFI] Does anyone recognize this RFI? (score: 1)
- Author: "Eddie Edwards" <eddieedwards@centurylink.net>
- Date: Wed, 15 Apr 2020 11:02:20 -0500
- Without seeing the motion, hard to tell what it's really doing. Anything with a free-running oscillator might cause that. Those old touch controlled lamps use to make multiple drifting spikes like th
- /archives//html/RFI/2020-04/msg00024.html (8,552 bytes)
- 3. Re: [RFI] Does anyone recognize this RFI? (score: 1)
- Author: K9MA <k9ma@sdellington.us>
- Date: Wed, 15 Apr 2020 11:48:21 -0500
- Looks like a switching power supply running at 55 kHz. If you zoom in on one of the spikes, you'll probably see an asymmetrical spectrum, with a longer tail on one side. And it will probably be drift
- /archives//html/RFI/2020-04/msg00025.html (8,775 bytes)
- 4. Re: [RFI] Does anyone recognize this RFI? (score: 1)
- Author: Jim Brown <jim@audiosystemsgroup.com>
- Date: Wed, 15 Apr 2020 10:25:12 -0700
- These are clocks or their harmonics from microprocessors built into various nearby equipment. Anything from refrigerators to home entertainment systems. 73, Jim K9YC On 4/15/2020 8:11 AM, Matt Foster
- /archives//html/RFI/2020-04/msg00026.html (8,144 bytes)
- 5. Re: [RFI] Does anyone recognize this RFI? (score: 1)
- Author: Jim Brown <jim@audiosystemsgroup.com>
- Date: Wed, 15 Apr 2020 10:27:05 -0700
- Unlikely. SMPS are free-running, modulated by noise, so they are "humps" of noise that drift. These signals are stable in frequency with no modulation. 73, Jim K9YC __________________________________
- /archives//html/RFI/2020-04/msg00027.html (7,915 bytes)
- 6. Re: [RFI] Does anyone recognize this RFI? (score: 1)
- Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>
- Date: Wed, 15 Apr 2020 18:03:00 +0000
- Most of those switchers do drift with temperature. They also show little jumps in frequency with voltage changes, so that, too, can be diagnostic. The real question is not usually the one hams always
- /archives//html/RFI/2020-04/msg00028.html (11,213 bytes)
- 7. Re: [RFI] Does anyone recognize this RFI? (score: 1)
- Author: K9MA <k9ma@sdellington.us>
- Date: Wed, 15 Apr 2020 13:48:08 -0500
- Ah, but they ARE drifting! I don't think the resolution in this image is good enough to see the modulation. The switching supplies I see usually are spread out over just a couple kHz. 73, Scott K9MA
- /archives//html/RFI/2020-04/msg00029.html (9,152 bytes)
- 8. Re: [RFI] Does anyone recognize this RFI? (score: 1)
- Author: Dave Cole <dave@nk7z.net>
- Date: Wed, 15 Apr 2020 11:50:16 -0700
- Here is a blog entry I created on locating RFI-- that is your real task... https://www.nk7z.net/i-have-rfi-now-what-locating-it/ It does not cover how to DF using loops, but it does give an overview.
- /archives//html/RFI/2020-04/msg00030.html (9,304 bytes)
- 9. Re: [RFI] Does anyone recognize this RFI? (score: 1)
- Author: K9MA <k9ma@sdellington.us>
- Date: Wed, 15 Apr 2020 13:52:35 -0500
- I may have misinterpreted the frequency scale, as I thought it was RF. It appears it is audio, Hz, not kHz, in which case I agree, it doesn't look like a switcher, but something modulated at 55 Hz. 7
- /archives//html/RFI/2020-04/msg00031.html (11,690 bytes)
- 10. Re: [RFI] Does anyone recognize this RFI? (score: 1)
- Author: Matt Foster <wedgef5@gmail.com>
- Date: Fri, 17 Apr 2020 14:48:32 -0500
- Yeah, sorry about that. I didn't make clear that the image was the waterfall from WSJT-X, so it's audio frequencies. At RF, it's right around 21.074 MHz. It looks like it could be something that is t
- /archives//html/RFI/2020-04/msg00055.html (13,634 bytes)
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