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References: [ +from:k1ttt.dave@gmail.com: 24 ]

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1. Re: [RFI] Local 1/3 duty cycle EMI (score: 1): Author: "David Robbins" <k1ttt.dave@gmail.com>; Date: Tue, 23 Jul 2019 11:14:34 -0500; Look for something that turns on and off or changes speed/color/brightness every 40 to 60 seconds... that strong across several bands it shouldn't be too far away so go mobile or start walking with a; /archives//html/RFI/2019-07/msg00062.html (8,937 bytes)
2. Re: [RFI] What would cause noise like this? (score: 1): Author: "David Robbins" <k1ttt.dave@gmail.com>; Date: Sat, 02 Nov 2019 08:40:13 -0500; I would generally agree that you are more likely to find the source with boots on the ground than on a computer screen... but there are a couple hints you might get from watching the waterfall. 1. wi; /archives//html/RFI/2019-11/msg00004.html (12,478 bytes)
3. Re: [RFI] Inter-station interference question. (score: 1): Author: "David Robbins" <k1ttt.dave@gmail.com>; Date: Thu, 21 Nov 2019 06:52:35 -0500; Since adding the stubs didn't do anything you should be looking either before them or after them... things before the stubs to check are all the cables and their connectors, case leakage from swr bri; /archives//html/RFI/2019-11/msg00037.html (11,630 bytes)
4. Re: [RFI] LED streetlights - Lumenistics (score: 1): Author: "David Robbins" <k1ttt.dave@gmail.com>; Date: Wed, 04 Mar 2020 13:19:53 -0500; No, and there are advertisements that show that led lamps still melt snow! David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://wiki.k1ttt.net AR-Cluster node: telnet://k1ttt.net:7373 --Orig; /archives//html/RFI/2020-03/msg00016.html (11,555 bytes)
5. Re: [RFI] Garage Door RFI (score: 1): Author: "David Robbins" <k1ttt.dave@gmail.com>; Date: Fri, 12 Jun 2020 10:19:05 -0500; Had a neighbor who had a problem like that... the funny thing is that it seems to affect operation even when the bulbs are off! how does that work??? David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net; /archives//html/RFI/2020-06/msg00012.html (8,861 bytes)
6. [RFI] solaredge questions (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Mon, 2 Nov 2020 18:45:31 -0500; Just found out a neighbor got a solaredge system installed over the summer, couldn't see it until recently when the leafs fell off the trees. It has apparently been active for about a month and I hav; /archives//html/RFI/2020-11/msg00004.html (7,104 bytes)
7. [RFI] solaredge installation (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Tue, 3 Nov 2020 15:28:53 -0500; Ok, who has the best summary that would be appropriate to send to an installation company about solaredge noise? Fortunately this installation is about 700' from my 20m stack but still generates s9 s; /archives//html/RFI/2020-11/msg00006.html (7,756 bytes)
8. Re: [RFI] 27 MHz band-pass filters? (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Wed, 18 Nov 2020 16:56:24 -0500; Buy a 10m one and retune it a bit. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://wiki.k1ttt.net AR-Cluster node: telnet://k1ttt.net:7373 Anyone have any leads on a plug-and-play BP fi; /archives//html/RFI/2020-11/msg00042.html (8,424 bytes)
9. Re: [RFI] Motor starting and UPS (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Sat, 21 Nov 2020 13:05:14 -0500; It will depend on the ups and the amount of the dip. I am surprised a circulation pump would draw enough to drop the voltage that much, usually they are relatively small. Is the ups on the same circu; /archives//html/RFI/2020-11/msg00053.html (9,329 bytes)
10. Re: [RFI] Astron Supplies, Monitors. (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Thu, 21 Jan 2021 07:31:26 -0500; Probably not, but its not hard to add a pot to a linear supply to change the output voltage that much. David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://wiki.k1ttt.net AR-Cluster node: te; /archives//html/RFI/2021-01/msg00104.html (8,696 bytes)
11. Re: [RFI] RFI-Free LED Monitor Recommendation (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Thu, 21 Jan 2021 07:35:27 -0500; I've got an lg 55" tv that's not bad, it has one odd birdie that sweeps up and down about 5khz very regularly at about 1 sweep per second that I hear on a couple bands, but its pretty weak. I am usin; /archives//html/RFI/2021-01/msg00105.html (8,721 bytes)
12. Re: [RFI] Fwd: I could see the arcs with binoculars last night! (Resolved?) (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Sat, 17 Apr 2021 06:41:29 -0400; There is also a UV camera developed, I heard, originally by the Israel military to detect rocket exhaust. We had one at the EPRI lab I worked at. It was actually 2 cameras in one that were lined up t; /archives//html/RFI/2021-04/msg00157.html (17,654 bytes)
13. Re: [RFI] Odd broadcast radio reception. (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Sun, 27 Jun 2021 21:27:50 -0400; aliens David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://wiki.k1ttt.net AR-Cluster node: telnet://k1ttt.net:7373 Here's a strange one! Giving the general description, in case anyone has e; /archives//html/RFI/2021-06/msg00072.html (10,213 bytes)
14. Re: [RFI] ANOTHER "WITH LOVE, from CHINA" (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Wed, 14 Jul 2021 07:57:09 -0400; I hate to generalize from a small sample, but years ago when LED bulbs were still relatively new I bought 2 of them to test out. The first one I tried had a similarly wide voltage range, like 85-260v; /archives//html/RFI/2021-07/msg00049.html (9,831 bytes)
15. Re: [RFI] Line noise vs Frequency (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Sun, 8 Aug 2021 09:42:10 -0400; I have had ones like that here off and on. Usually traced to pole guy wires that had loose or corroded connection to the pole ground. The utility here has started adding a 5' or so insulating section; /archives//html/RFI/2021-08/msg00006.html (8,769 bytes)
16. Re: [RFI] Line noise vs Frequency (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Sun, 8 Aug 2021 14:00:35 -0400; Rain can also fill small gaps in hardware causing the arcing to become just a steady current. It can also increase conductivity of dirty or damaged insulator surfaces so again they pass a continuous; /archives//html/RFI/2021-08/msg00012.html (12,330 bytes)
17. Re: [RFI] DFing intermittent connection (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Sun, 8 Aug 2021 15:48:00 -0400; I would go up with a long pole (preferably fiberglass or some other insulator) and start whacking things to see if you can stimulate it. Also pull and push on all the cables, check that connections a; /archives//html/RFI/2021-08/msg00017.html (9,538 bytes)
18. Re: [RFI] Mystery noise (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Wed, 11 Aug 2021 14:33:41 -0400; Well, when you mix several signals non-linearly you get all the +/- combinations of the fundamentals and harmonics. So you've got 60hz line frequency harmonics giving you the 120hz component plus th; /archives//html/RFI/2021-08/msg00032.html (7,800 bytes)
19. Re: [RFI] Travel trailer converter RFI solutions (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Fri, 22 Jul 2022 14:42:10 -0400; I would be very suspicious of the growl caused by ferrites on the dc line, the only reason for that would be ripple, aka noise, on the dc output. May be worth putting a scope on that or at least addi; /archives//html/RFI/2022-07/msg00049.html (9,591 bytes)
20. Re: [RFI] Caught in the act! (score: 1): Author: <k1ttt.dave@gmail.com>; Date: Mon, 1 Aug 2022 12:33:41 -0400; "Then looking around, I noticed a broken side mounted insulator on the high voltage line, with that line laying across the service drops to four nearby houses." That is a major safety issue and shoul; /archives//html/RFI/2022-08/msg00001.html (11,092 bytes)

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