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Total 144 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)

130. [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)

131. 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)

132. 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)

133. Re: [RFI] New RFI Source (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Thu, 1 Aug 2024 13:04:26 -0500
Hi Mike, The other copies (harmonics of 78 kHz) show exactly the same structure. I hear the signal only on 20 meters, across the whole band.  They certainly go beyond the band, but it's hard to tell
/archives//html/RFI/2024-08/msg00002.html (13,603 bytes)

134. Re: [RFI] New RFI Source (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Thu, 1 Aug 2024 14:45:53 -0500
Source found. It's a Generac solar system 640 meters (0.4 miles) from my tower. The homeowners were very cooperative, and switched the inverter off for the test, which was conclusive. The location is
/archives//html/RFI/2024-08/msg00003.html (14,541 bytes)

135. Re: [RFI] New RFI Source (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Thu, 1 Aug 2024 15:01:56 -0500
BTW, the ARRL solar RFI page has an image of the Generac spectrum, which looks exactly like what W9RE and I are seeing. https://www.arrl.org/solar 73, Scott K9MA It's a partly cloudy day here, so I s
/archives//html/RFI/2024-08/msg00004.html (8,623 bytes)

136. Re: [RFI] New RFI Source (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Thu, 1 Aug 2024 15:53:38 -0500
Will do! 73, Scott K9MA Great sleuthing, Scott. Suggest that you talk to Ed Hare and/or W1EMI first. 73, Jim K9YC _______________________________________________ RFI mailing list RFI@contesting.com h
/archives//html/RFI/2024-08/msg00006.html (8,129 bytes)

137. Re: [RFI] New RFI Source (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Thu, 1 Aug 2024 16:07:28 -0500
Both my immediate neighbor and I have Enphase systems. I had single-turn ferrite cores put on all the leads of both, and I've detected absolutely no RFI from them. Whether the ferrites were necessary
/archives//html/RFI/2024-08/msg00008.html (9,072 bytes)

138. Re: [RFI] New RFI Source (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Thu, 1 Aug 2024 16:23:30 -0500
A useful data point. Given the labor involved in installing the ferrites after the panels were installed, I decided it was cheap insurance to just put them on first. 73, Scott K9MA David Robbins K1TT
/archives//html/RFI/2024-08/msg00010.html (9,750 bytes)

139. [RFI] Generac Solar System RFI (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Thu, 15 Aug 2024 13:24:03 -0500
A few weeks ago, I tracked the source of 14 MHz interference to a neighbor's Generac solar system about 0.4 miles away. After I contacted the local installer, this morning I got a call from a Generac
/archives//html/RFI/2024-08/msg00015.html (7,335 bytes)

140. Re: [RFI] Generac Solar System RFI (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Thu, 15 Aug 2024 15:46:30 -0500
The installer wasn't responsive initially, until I tracked down a contact person and persisted in trying to contact her. I think the ARRL made contact with Generac, as well. 73, Scott K9MA A few week
/archives//html/RFI/2024-08/msg00018.html (8,690 bytes)

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