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References: [ +subject:/^(?:^\s*(re|sv|fwd|fw)[\[\]\d]*[:>-]+\s*)*\[RFI\]\s+periodic\s+peaks\s+in\s+the\s+spectrum\s*$/: 12 ]

Total 12 documents matching your query.

1. [RFI] periodic peaks in the spectrum (score: 1): Author: Ramakrishnan Muthukrishnan <ram@rkrishnan.org>; Date: Tue, 20 Jul 2021 21:48:35 +0530; Dear RFI-hackers: I have been experiencing QRM from some unknown source for the past several months, a picture of it is here: <http://rkrishnan.org/files/40m-qrm.png> This happens in every band and i; /archives//html/RFI/2021-07/msg00056.html (8,584 bytes)
2. Re: [RFI] periodic peaks in the spectrum (score: 1): Author: Christopher Wawak <kc2ieb@wawak.org>; Date: Tue, 20 Jul 2021 12:24:16 -0400; 20 khz looks like AC compressor motor noise. _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi; /archives//html/RFI/2021-07/msg00057.html (8,761 bytes)
3. Re: [RFI] periodic peaks in the spectrum (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Tue, 20 Jul 2021 10:23:23 -0700; The typical home in the US has dozens of electronic noise sources, mostly switch-mode power supplies (SMPS), but also devices that have microprocessors built in -- everything from refrigerators to ho; /archives//html/RFI/2021-07/msg00058.html (9,193 bytes)
4. Re: [RFI] periodic peaks in the spectrum (score: 1): Author: Thomas Mills <tsmills@bellsouth.net>; Date: Tue, 20 Jul 2021 15:51:27 -0400; I had something very much the same. It turned out to be a variable speed fan motor on the HVAC. Could be coming from your Nextdoor. My problem started after I replace he HVAC unit. Common mode chokes; /archives//html/RFI/2021-07/msg00059.html (9,743 bytes)
5. Re: [RFI] periodic peaks in the spectrum (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Tue, 20 Jul 2021 14:02:49 -0600; I successfully use a home brew 0.5-meter diameter shielded and untuned loop for DFing and RFI sleuthing. I couple that through a broadband transformer to a receiver. I let the receiver do the frequen; /archives//html/RFI/2021-07/msg00060.html (10,175 bytes)
6. Re: [RFI] periodic peaks in the spectrum (score: 1): Author: Don Kirk <wd8dsb@gmail.com>; Date: Tue, 20 Jul 2021 20:33:05 -0400; Hi Ram, I recently built and tested side by side numerous direction finding tuned loops, untuned unshielded loops, untuned non shielded loops, loops with chokes, loops with transformers, terminated l; /archives//html/RFI/2021-07/msg00061.html (11,693 bytes)
7. Re: [RFI] periodic peaks in the spectrum (score: 1): Author: Ramakrishnan Muthukrishnan <ram@rkrishnan.org>; Date: Wed, 21 Jul 2021 13:01:43 +0530; Hello Don, Dave, Jim and others: Thanks so much for all the wonderful information. I have started reading the articles mentioned in order to build a DF loop. I think I am going to try Don's design al; /archives//html/RFI/2021-07/msg00062.html (15,129 bytes)
8. Re: [RFI] periodic peaks in the spectrum (score: 1): Author: Don Kirk <wd8dsb@gmail.com>; Date: Wed, 21 Jul 2021 04:55:49 -0400; Hi Ram, I don't know if you can get access to your neighbors circuit breaker box or what his circuit breakers even looks like, but I have had great success using a simple 1 inch loop to sniff circuit; /archives//html/RFI/2021-07/msg00063.html (17,517 bytes)
9. Re: [RFI] periodic peaks in the spectrum (score: 1): Author: Ramakrishnan Muthukrishnan <ram@rkrishnan.org>; Date: Wed, 21 Jul 2021 18:26:06 +0530; Hello Don, Thanks again, I am learning a lot from this thread. The 1" sniffing loop trick looks great! I am surely going to build it. I am sure this is not the last RFI I am going to encounter. I hav; /archives//html/RFI/2021-07/msg00064.html (19,057 bytes)
10. Re: [RFI] periodic peaks in the spectrum (score: 1): Author: Don Kirk <wd8dsb@gmail.com>; Date: Thu, 22 Jul 2021 09:45:52 -0400; Hi Jim, I wanted to follow up regarding the link that you provided to the NA6O tuned loop. While it has some nice features, I'm concerned it still might be a little too complicated (intimidating) for; /archives//html/RFI/2021-07/msg00065.html (13,503 bytes)
11. Re: [RFI] periodic peaks in the spectrum (score: 1): Author: Gary Johnson <gwj@wb9jps.com>; Date: Thu, 22 Jul 2021 15:15:56 -0700; Good work as usual, Don. I'm all for simple! I'd like to include your link below on my RFI page. This is exactly the kind of tool that the members of our local clubs can benefit from as they discover; /archives//html/RFI/2021-07/msg00066.html (9,480 bytes)
12. Re: [RFI] periodic peaks in the spectrum (score: 1): Author: Don Kirk <wd8dsb@gmail.com>; Date: Thu, 22 Jul 2021 18:43:26 -0400; Hi Gary, You certainly may use the link to my tuned loop webpage. Im sure its not nearly as well balanced as your design (especially as you get up higher in frequency like 28 MHz), but it still does; /archives//html/RFI/2021-07/msg00067.html (10,304 bytes)

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