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References: [ +from:k9ma@sdellington.us: 129 ]

Total 129 documents matching your query.

121. [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)

122. 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)

123. 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)

124. 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)

125. 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)

126. 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)

127. 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)

128. Re: [RFI] Finally located my RFI (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Fri, 21 Jun 2024 16:15:46 -0500
On 6/21/2024 3:56 PM, Dave (NK7Z) wrote: No problem on winding turns, and thanks!!!  I will tune the ferrite to 24 MHz., and see how that works...  I am setting up a test jig to hold a ferrite out in
/archives//html/RFI/2024-06/msg00052.html (9,583 bytes)

129. Re: [RFI] Replacement For Fluorescent Tubes (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Tue, 25 Jun 2024 23:38:42 -0500
I'm not sure what kind of ballasts they were, but a neighbor installed LED replacement "tubes", and they created terrible RFI. (OK, they were only 50 feet from my RX loop.) I'd recommend just replaci
/archives//html/RFI/2024-06/msg00056.html (7,697 bytes)

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