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41. Re: [RFI] NEW REFRIGERATOR/FREEZER from KITCHENAID (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Thu, 1 Oct 2020 12:43:48 -0500; Many years ago, I worked for a small, well-known US electronics manufacturer. I was in R&D, and the standing joke was that once a design went to manufacturing, they pulled out parts one at a time unt; /archives//html/RFI/2020-10/msg00004.html (9,071 bytes)
42. Re: [RFI] Noisy PC Speakers (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Mon, 5 Oct 2020 13:52:11 -0500; Perhaps because the speaker wires were acting as a counterpoise, and actually increasing the conducted emissions on the power leads. Did you try a common mode filter on the power leads when the speak; /archives//html/RFI/2020-10/msg00033.html (8,295 bytes)
43. Re: [RFI] Ensuring an RFI free air conditioner install (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Wed, 7 Oct 2020 23:26:13 -0500; FWIW, I've had two Bryant furnaces (not A/C) with variable speed fan motors and the associated electronics. Neither has had any RFI issues, in either direction. My gas water heater, however, died eve; /archives//html/RFI/2020-10/msg00047.html (10,965 bytes)
44. Re: [RFI] Anyone Tested These LED Light Bars for RFI? (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Sun, 11 Oct 2020 21:20:25 -0500; One problem is that even if a particular model is quiet, the next batch of that model might not be. I put a bunch of different LED fixtures in my house recently. Before I installed them, I powered up; /archives//html/RFI/2020-10/msg00052.html (8,892 bytes)
45. Re: [RFI] Sine wave correction for small generators (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Mon, 2 Nov 2020 10:53:48 -0800; Circulating current likely precludes this option, as the high current would probably saturate and/or overheat the transformer. 73, Scott K9MA -- Scott Ellington -- via iPad __________________________; /archives//html/RFI/2020-11/msg00002.html (7,330 bytes)
46. [RFI] Green Wire RFI (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Fri, 13 Nov 2020 17:48:27 -0700; While I generally agree that the green (ground) wire should go through the CM choke, heres an exception: My gas water heater was shutting down whenever I was on 160. It has a grounding cord, but the; /archives//html/RFI/2020-11/msg00024.html (7,074 bytes)
47. Re: [RFI] Green Wire RFI (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Sun, 15 Nov 2020 12:06:49 -0700; It is a Direct Vent type, with a blower and electrical ignition. Of course, I verified that the tank was connected to the copper plumbing and electrical system ground. I could connect the green wire; /archives//html/RFI/2020-11/msg00029.html (9,292 bytes)
48. Re: [RFI] Green Wire RFI (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Sun, 15 Nov 2020 14:16:38 -0700; If both ends of a winding of a common mode choke are connected together, its like a transformer with a shorted winding and the impedance of the other windings is reduced. Ill connect the green wire,; /archives//html/RFI/2020-11/msg00033.html (11,725 bytes)
49. Re: [RFI] New HDTV Purchase - What to Avoid? (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Tue, 8 Dec 2020 21:25:38 -0600; Absolutely! I had to buy some neighbors a new TV a couple years ago. Then they moved away! 73, Scott K9MA Bad fingers -- of course I meant super BAD news. :) 73, Jim _________________________________; /archives//html/RFI/2020-12/msg00011.html (8,841 bytes)
50. Re: [RFI] New HDTV Purchase - What to Avoid? (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Wed, 9 Dec 2020 11:18:53 -0600; I was lucky to have more cooperative neighbors, who did let me buy them a new TV. Plasma TV are impossible to fix. They are big enough that they radiate directly at HF, so choking the cables won't he; /archives//html/RFI/2020-12/msg00016.html (9,851 bytes)
51. Re: [RFI] QUESTION (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Mon, 21 Dec 2020 21:56:26 -0600; I saw something like this when I was testing a QRP transceiver, listening via the main antenna on the K3/P3. Even on the fundamental, it looked like there was all sorts of hash, sidebands, etc. It wa; /archives//html/RFI/2020-12/msg00103.html (9,251 bytes)
52. Re: [RFI] Single stage HVAC with ECM (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Sat, 9 Jan 2021 00:16:10 -0600; FWIW, I've had two Bryant furnaces over the past 28 years, with no RFI problems in either direction. Both had variable speed inducer motors and two speed blowers. The blowers may just be two speed in; /archives//html/RFI/2021-01/msg00030.html (9,734 bytes)
53. Re: [RFI] Pole mounted lightning arresters? (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Mon, 11 Jan 2021 14:40:57 -0600; I've tracked line noise to lightning arrestors, though sometimes I've been able to hear ultrasonic noise. However, as others have pointed out, any two poorly bonded pieces of metal near the lines can; /archives//html/RFI/2021-01/msg00038.html (10,185 bytes)
54. Re: [RFI] Pole mounted lightning arresters? (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Mon, 11 Jan 2021 17:20:31 -0600; Unfortunately, the Radar Engineers ultrasonic tracker is way out of the price range of most amateurs. While the MFJ one isn't as sensitive, it can be useful. I've often been able to hear the offendin; /archives//html/RFI/2021-01/msg00043.html (14,706 bytes)
55. Re: [RFI] New RFI (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Tue, 12 Jan 2021 10:31:23 -0600; I've also had success with the MFJ-856. However, when you get close to a strong source, it can overload and lock up. My solution was to make two wide straps of thin aluminum with which to short out t; /archives//html/RFI/2021-01/msg00061.html (10,503 bytes)
56. Re: [RFI] New RFI (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Wed, 13 Jan 2021 00:06:40 -0600; It just depends on the neighbor. I guess I'm very fortunate that aside from the lady 25 years ago who was going to "Shoot my tower down", my neighbors have been very cooperative. Had I not gone in th; /archives//html/RFI/2021-01/msg00069.html (20,552 bytes)
57. Re: [RFI] New RFI (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Wed, 13 Jan 2021 00:11:35 -0600; I haven't tried using an antenna with a sharp null, but I wonder how well it really works with power line noise. The problem seems to be that the lines themselves radiate so much that it often appear; /archives//html/RFI/2021-01/msg00070.html (12,367 bytes)
58. Re: [RFI] New RFI (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Wed, 13 Jan 2021 08:21:11 -0600; Hi Don, My experience is very similar to yours, using the MFJ-856. To make sure I have the right source, I relay the audio from the HF receiver at home, and listen for a matching pattern on 135 MHz.; /archives//html/RFI/2021-01/msg00076.html (14,260 bytes)
59. [RFI] RFI Measurements (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Tue, 19 Jan 2021 15:28:09 -0600; I got to wondering just how bad the usual RFI is in my urban QTH, compared to a rural area. I've long been doing battle with the local power company and have had them fix many of the worst noise sour; /archives//html/RFI/2021-01/msg00091.html (8,365 bytes)
60. Re: [RFI] Astron Supplies, Monitors. (score: 1): Author: K9MA <k9ma@sdellington.us>; Date: Thu, 21 Jan 2021 11:16:11 -0600; If you turn a 24 V linear supply down to 19 V, you should derate the current capacity perhaps 25 percent. (Depends on the voltage ahead of the regulator.) 73, Scott K9MA Not sure what the authority o; /archives//html/RFI/2021-01/msg00111.html (9,986 bytes)

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