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Total 175 documents matching your query.

161. Re: [RFI] Curious If RFI.Com is still active? (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Thu, 11 Sep 2025 17:36:22 -0500
Maybe it's a matter of "No news is good news"? I can report that after more than a year, Generac still hasn't found a solution to the RFI problem from my neighbor's solar system.  It's still turned o
/archives//html/RFI/2025-09/msg00004.html (8,506 bytes)

162. Re: [RFI] What Possibly Is This RFI?? (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Wed, 1 Oct 2025 16:02:30 -0500
On 10/1/2025 3:35 PM, Christopher Wawak wrote: Tune to an unused frequency in the AM band where you can hear the noise. Then, start walking around your property, neighborhood, etc. See where it gets
/archives//html/RFI/2025-10/msg00008.html (10,106 bytes)

163. [RFI] Broadband RFI on 10 meters (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Wed, 15 Oct 2025 17:14:19 -0500
At 22Z Oct. 15, I'm hearing very broadband RFI on 10 meters, nearly 30 dB above my usual urban noise level. It's not rain static, and it peaks at about 345 degrees. There's no QSB, so I'm sure it's l
/archives//html/RFI/2025-10/msg00018.html (6,771 bytes)

164. Re: [RFI] Broadband RFI on 10 meters (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Wed, 15 Oct 2025 20:56:20 -0500
Can get a long time, wide frequency waterfall of the noise and email it to a few of us? 73, Jim K9YC It really wouldn't be very interesting: Just featureless broadband noise 368 kHz wide, which is as
/archives//html/RFI/2025-10/msg00020.html (7,493 bytes)

165. Re: [RFI] Broadband RFI on 10 meters (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Wed, 15 Oct 2025 21:05:35 -0500
At 02Z Oct. 16, the AM audio spectrum looks like this: (Assuming the image gets through.) It is much weaker than it was at 22Z, and I didn't hear the 1 kHz components then, but it is peaking in the s
/archives//html/RFI/2025-10/msg00021.html (8,605 bytes)

166. Re: [RFI] Broadband RFI on 10 meters (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Wed, 15 Oct 2025 21:10:23 -0500
Here's a link to the image: https://sdellington.us/hr/RFI/10m_25.10.16.jpg (Assuming the image gets through.) It is much weaker than it was at 22Z, and I didn't hear the 1 kHz components then, but it
/archives//html/RFI/2025-10/msg00022.html (8,636 bytes)

167. Re: [RFI] Broadband RFI on 10 meters (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Wed, 15 Oct 2025 23:11:38 -0500
In fact, the audio DOES tell us something: That modulation is clearly audible. If I can hear that with a portable AM receiver, and it makes no difference what frequency it is tuned to over a wide ran
/archives//html/RFI/2025-10/msg00024.html (9,041 bytes)

168. Re: [RFI] Broadband RFI on 10 meters (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Fri, 17 Oct 2025 19:48:44 -0500
Links to RF and AM audio spectra below. The noise level is about 30 dB above my usual noise floor at the same span.  It is definitely directional, so it's not internal to my station.  It's certainly
/archives//html/RFI/2025-10/msg00025.html (9,735 bytes)

169. Re: [RFI] Broadband RFI on 10 meters (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Fri, 17 Oct 2025 22:35:08 -0500
This is embarrassing, but I've found the source: My own ebike charger. The important lesson here is that such devices can produce broadband noise, without the spectral peaks one expects at harmonics
/archives//html/RFI/2025-10/msg00026.html (10,942 bytes)

170. Re: [RFI] Broadband RFI on 10 meters (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Sat, 18 Oct 2025 09:51:34 -0500
The antenna is at 70 feet, about 50 feet south of where the charger was located in the garage, so the heading was about right. That may have had more to do with polarization. The charger is one of th
/archives//html/RFI/2025-10/msg00029.html (18,608 bytes)

171. Re: [RFI] RFI Signature (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Sun, 23 Nov 2025 14:03:29 -0600
I've seen a couple cases of RFI that looked like random noise. However, in AM mode, the audio showed distinct frequencies, in one case around 2 kHz, another harmonics of 120 Hz. The former was a batt
/archives//html/RFI/2025-11/msg00001.html (9,165 bytes)

172. [RFI] 80m RFI with QSB (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Thu, 11 Dec 2025 23:45:21 -0600
This seems very strange: At 0520Z Dec. 12, I'm hearing harmonics of 39 kHz from 3507 up. They're drifting around a lot, like SMPS harmonics, and are 2-3 kHz wide. But they have QSB, so they're almost
/archives//html/RFI/2025-12/msg00005.html (7,134 bytes)

173. Re: [RFI] Escalade and Power Line RFI (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Mon, 15 Dec 2025 11:06:02 -0600
On 12/14/2025 6:40 PM, Gary Johnson via RFI wrote: K6KM had problems charging his Tesla at home off of 240V. Kept switching to low-current mode and taking forever to charge. The company swapped out c
/archives//html/RFI/2025-12/msg00016.html (8,252 bytes)

174. [RFI] 80m RFI (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Tue, 16 Dec 2025 23:10:52 -0600
A new source has just shown up: https://sdellington.us/hr/RFI/25.12.17%200454Z.jpg The harmonics are about 8 kHz apart, which is awfully low for a SMPS, though that's what it looks like. I'm only hea
/archives//html/RFI/2025-12/msg00022.html (6,666 bytes)

175. Re: [RFI] Question for the group... (score: 1)
Author: K9MA <k9ma@sdellington.us>
Date: Thu, 1 Jan 2026 11:02:19 -0600
If your neighbor's system is from Generac, that's very bad news. Several of my nearby neighbors have Enphase and AP Systems microinverter systems, from which I've detected no RFI. The neighbor immedi
/archives//html/RFI/2026-01/msg00001.html (8,234 bytes)

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