Mail Archive Search: <+subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[RFI\]\s+New\s+RFI\s+Source\s*$/>

Results:

References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[RFI\]\s+New\s+RFI\s+Source\s*$/: 30 ]

Total 30 documents matching your query.

1. [RFI] New RFI Source (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Sun, 26 May 2024 12:15:45 -0500; I'm hearing a new local RFI source. It produces a 1 second burst of broadband noise at regular intervals of 3.5 seconds. I'm hearing it on 80 through 15 meters. In AM mode, it sounds like it's modula; /archives//html/RFI/2024-05/msg00002.html (6,538 bytes)
2. Re: [RFI] New RFI Source (score: 1): Author: AA5CT via RFI <rfi@contesting.com>; Date: Sun, 26 May 2024 19:16:05 +0000 (UTC); How close to somebody with a large fenced horse yard do you live? Sounds like an electric fence charger cycling. de AA5CT Jim On Sunday, May 26, 2024, 12:17:13 PM GMT-5, K9MA <k9ma@sdellington.us> wr; /archives//html/RFI/2024-05/msg00003.html (7,796 bytes)
3. Re: [RFI] New RFI Source (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Sun, 26 May 2024 14:52:55 -0500; I'm in the middle of a city, so there are no electric fences or horses nearby. I was able to hear it with a portable receiver just now. As I was standing near a neighbor's house which seemed a likely; /archives//html/RFI/2024-05/msg00004.html (8,083 bytes)
4. Re: [RFI] New RFI Source (score: 1): Author: AA5CT via RFI <rfi@contesting.com>; Date: Mon, 27 May 2024 04:23:23 +0000 (UTC); Another possibility - aquarium heater? One of those jobbies that clamps over the edge of the aquarium in a glass tube maybe an inch diameter and 4 or so inches long. de AA5CT Jim On Sunday, May 26, 2; /archives//html/RFI/2024-05/msg00005.html (8,487 bytes)
5. [RFI] New RFI Source (score: 1): Author: vk3od--- via RFI <rfi@contesting.com>; Date: Mon, 27 May 2024 05:25:54 +0000 (UTC); Check for anyone with those "Garden Lights" many of them are using LED's with nasty switch mode power supplies from the usual culprit country. You will also note many are on a night/day sense charge; /archives//html/RFI/2024-05/msg00006.html (7,745 bytes)
6. Re: [RFI] New RFI Source (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Mon, 27 May 2024 11:13:50 -0500; I did once track down one of those, but it had the characteristic spectrum of a switching supply. This one emits absolutely flat broadband noise, more like a spark gap. It is on for about 1 second ev; /archives//html/RFI/2024-05/msg00007.html (8,265 bytes)
7. Re: [RFI] New RFI Source (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Mon, 27 May 2024 11:51:48 -0500; Spectrum screenshot: https://sdellington.us/hr/RFI/24.05.27.jpg Unfortunately, it has now become intermittent, which will make tracking more challenging. 73, Scott K9MA -- Scott K9MA k9ma@sdellington; /archives//html/RFI/2024-05/msg00008.html (7,172 bytes)
8. Re: [RFI] New RFI Source (score: 1): Author: AA5CT via RFI <rfi@contesting.com>; Date: Mon, 27 May 2024 17:48:46 +0000 (UTC); Well, thinking here is a bimetallic strip feeding a heating element would be broadband,as there is nothing periodic in that like a 35 kHz swticher for instance, Oh - I have tracked down a couple door; /archives//html/RFI/2024-05/msg00009.html (9,091 bytes)
9. Re: [RFI] New RFI Source (score: 1): Author: Pete Smith N4ZR <pete.n4zr@gmail.com>; Date: Mon, 27 May 2024 13:54:13 -0400; That makes it harder - unless, of course, it's something defective that is in the process of failing. 73, Pete N4ZR https://sdellington.us/hr/RFI/24.05.27.jpg Unfortunately, it has now become interm; /archives//html/RFI/2024-05/msg00010.html (7,811 bytes)
10. Re: [RFI] New RFI Source (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Mon, 27 May 2024 15:26:45 -0500; Yes, I thought I was getting close this morning, then it went QRT. I've been tracking it with a small 20m loop. I can hear it just down the street in the right direction, but can't find a good null.; /archives//html/RFI/2024-05/msg00011.html (8,829 bytes)
11. Re: [RFI] New RFI Source (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Mon, 27 May 2024 17:54:58 -0500; I've tracked it down to a neighbors' house. It was easily detected with my VHF tracker. Unfortunately, the homeowner is not cooperative. The source seemed to be associated with a TV and modem/router; /archives//html/RFI/2024-05/msg00012.html (8,611 bytes)
12. Re: [RFI] New RFI Source (score: 1): Author: Frank W3LPL <donovanf@starpower.net>; Date: Mon, 27 May 2024 19:08:03 -0400 (EDT); Hi Scott RFI propagating from a source close to the ground (less than about 1/4 wavelength high) is always vertically polarized unless the ground is extremely nonconductive. 73 Frank W3LPL I've track; /archives//html/RFI/2024-05/msg00013.html (9,264 bytes)
13. Re: [RFI] New RFI Source (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Mon, 27 May 2024 22:45:52 -0500; RFI propagating from a source close to the ground (less than about 1/4 wavelength high) is always vertically polarized unless the ground is extremely nonconductive. 73 Frank W3LPL Hi Frank, I was als; /archives//html/RFI/2024-05/msg00014.html (8,844 bytes)
14. [RFI] New RFI Source (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Wed, 31 Jul 2024 16:08:00 -0500; This RFI source has appeared recently: https://sdellington.us/hr/RFI/24.07.31.png It appears to be harmonics of about 78 kHz. However, unlike most SMPS RFI, it is very stable. It disappears at night,; /archives//html/RFI/2024-07/msg00138.html (7,388 bytes)
15. Re: [RFI] New RFI Source (score: 1): Author: Michael Carter via RFI <rfi@contesting.com>; Date: Wed, 31 Jul 2024 21:28:20 +0000; Hi Scott, The sidebands are not typical of any SMPS I've looked at spectrally. The fine spectral structure inside the main lobe suggest 60 Hz or 120 Hz modulation of the nominal 'carrier', but the si; /archives//html/RFI/2024-07/msg00139.html (10,112 bytes)
16. Re: [RFI] New RFI Source (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Wed, 31 Jul 2024 16:56:48 -0500; The carriers within that main lobe appear to be 120 Hz apart, so likely line related. They seem to vary in amplitude, but are very stable in frequency. 73, Scott K9MA The sidebands are not typical of; /archives//html/RFI/2024-07/msg00140.html (10,790 bytes)
17. Re: [RFI] New RFI Source (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Wed, 31 Jul 2024 17:04:26 -0700; The fact that the RF is stable in frequency indicates it's running on a clock, not free-running, and there's none of the FM that's typical of SMPS. 73, Jim K9YC ______________________________________; /archives//html/RFI/2024-07/msg00141.html (7,882 bytes)
18. Re: [RFI] New RFI Source (score: 1): Author: Michael Carter via RFI <rfi@contesting.com>; Date: Thu, 1 Aug 2024 00:26:13 +0000; Scott, do the spectral copies at 78 kHz intervals mimic the sideband structure shown in your K4 screen capture? Over what frequency range can you see the spectral copies (limited by antenna bandwidth; /archives//html/RFI/2024-07/msg00142.html (12,670 bytes)
19. Re: [RFI] New RFI Source (score: 1): Author: Don Kirk <wd8dsb@gmail.com>; Date: Wed, 31 Jul 2024 22:45:46 -0400; Hi Scott, I never like to guess but take a look at this video showing RFI we tracked down last year at W9RE and you will see similarities to what you are seeing and you might also gain some info/insi; /archives//html/RFI/2024-07/msg00143.html (8,321 bytes)
20. Re: [RFI] New RFI Source (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Thu, 1 Aug 2024 12:55:40 -0500; Hi Don, That looks very much like the signal I'm seeing. I'm pretty sure it's some kind of comm system, as I can see what looks like modulation of the broad sidebands. They vary both in amplitude an; /archives//html/RFI/2024-08/msg00001.html (8,637 bytes)

Current List: 1 - 20
Page: [1] [2]