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301. Re: [RFI] Mystery noise (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Fri, 13 Aug 2021 18:54:38 +0000; Christopher, don't laugh at that proposal. I once worked with a couple of retired engineers from Los Alamos. They actually proposed such a communication mode. Why did you 'say too much'. You've got m; /archives//html/RFI/2021-08/msg00053.html (12,765 bytes)
302. Re: [RFI] Mystery noise (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Fri, 13 Aug 2021 19:08:06 +0000; It was aimed at the lower HF frequencies. Measured to perform well there on the HP 8753C. It worked quite well. The interference from multiple SMPSs within the unit registered S-8 to S-9 before choke; /archives//html/RFI/2021-08/msg00055.html (11,749 bytes)
303. Re: [RFI] Mystery noise (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Sat, 14 Aug 2021 16:06:43 +0000; The problem with the new refrigerator/freezer was from the BC band through 40-meters. 20-meters on up was not affected. Dave - WØLEV -- *Dave - WØLEV* *Just Let Darwin Work* _________________________; /archives//html/RFI/2021-08/msg00059.html (9,255 bytes)
304. Re: [RFI] Link access to RFI on contesting.com (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Wed, 25 Aug 2021 23:32:03 +0000; It's pretty intuitive: RFI@CONTESTING.COM I'll confess I couldn't find it on the main page. I find it discouraging that there is not a more available and widely distributed RFI site for amateurs. How; /archives//html/RFI/2021-08/msg00103.html (8,591 bytes)
305. Re: [RFI] Link access to RFI on contesting.com (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Thu, 26 Aug 2021 15:39:26 +0000; Well, evidently I offended you in attempting to answer your question. So be it...... Dave - WØLEV -- *Dave - WØLEV* *Just Let Darwin Work* _______________________________________________ RFI mailing; /archives//html/RFI/2021-08/msg00107.html (8,478 bytes)
306. [RFI] ACCESS (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Thu, 26 Aug 2021 15:40:40 +0000; Evidently the link to the RFI resources has been deleted from the contesting site. Is there a reason? -- *Dave - WØLEV* *Just Let Darwin Work* _______________________________________________ RFI mail; /archives//html/RFI/2021-08/msg00108.html (6,238 bytes)
307. Re: [RFI] ACCESS (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Thu, 26 Aug 2021 17:06:58 +0000; It sure is. I've had three or four emails over the last week commenting that it is no longer on the contesting.com site, which it is not. But, clearly under "lists". Thank you. Dave - WØLEV -- *Dave; /archives//html/RFI/2021-08/msg00110.html (7,765 bytes)
308. Re: [RFI] Maintaining 50 Ohms... (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Sat, 18 Sep 2021 00:54:56 +0000; I have lost too many preamps due to near-by lightning and static discharge. After the last (expensive) MMIC failure, I have made a practice of installing a resistor to return (chassis or "ground") ac; /archives//html/RFI/2021-09/msg00042.html (8,074 bytes)
309. Re: [RFI] Water treatment system RFI? (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Mon, 20 Sep 2021 02:22:06 +0000; We are facing the same situation here in Northern Colorado with "rather" (read extremely) hard well water. The first outfit we had up here refused to do anything once I brought up the RFI issue. Any; /archives//html/RFI/2021-09/msg00055.html (8,112 bytes)
310. Re: [RFI] Fwd: Water treatment system RFI? (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Mon, 20 Sep 2021 16:17:19 +0000; Don, I'm in the same boat. As we all know, Part 15 does not assure acceptable interference levels for amateur radio (or radio astronomy - another hobby). I also asked for a photo of the regulatory la; /archives//html/RFI/2021-09/msg00061.html (9,191 bytes)
311. Re: [RFI] Fwd: Water treatment system RFI? (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Wed, 22 Sep 2021 00:20:14 +0000; This is basically what we have with 1 Cubic Foot of resin which treats only the carbonates. We have both Na carbonates (limestone) and sulfates (gypsum) in the well water. Problem is after 5 years of; /archives//html/RFI/2021-09/msg00076.html (14,495 bytes)
312. Re: [RFI] Who Cares About HF EMI? (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Wed, 22 Sep 2021 19:24:01 +0000; There is a good reason for this. I've worked RFI/EMC for some 35 years. FCC, the EU, and most other agencies require the following: Radiated Emissions: Lower Limit is 30 MHz Upper limit (FCC): Highes; /archives//html/RFI/2021-09/msg00084.html (9,747 bytes)
313. Re: [RFI] Fwd: Water treatment system RFI? (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Sat, 25 Sep 2021 18:24:56 +0000; Agreed ! ! ! But Mr. Pillow is still going strong. As with antennas and transmission lines in amateur radio, snake oil and wizardry always prevails over real science and engineering. Consider the fla; /archives//html/RFI/2021-09/msg00112.html (17,971 bytes)
314. Re: [RFI] RFI LG Refrig Corcom filter and #31 core (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Wed, 29 Sep 2021 19:31:49 +0000; We had a problem with a new Kitch Aid frig. RFI throughout HF to 14 MHz. A hefty common mode choke "mostly" fixed the problem. Remember, home appliances are specifically excluded from any obligation; /archives//html/RFI/2021-09/msg00124.html (9,761 bytes)
315. Re: [RFI] Request for comments, Rheem HVAC (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Sun, 3 Oct 2021 18:03:27 +0000; I spotted the close proximity of the input 3-phase power and power to the compressor right off the bat as did you. Your other approaches are certainly good, excellent, with the possible exception of; /archives//html/RFI/2021-10/msg00010.html (13,903 bytes)
316. Re: [RFI] Request for comments, Rheem HVAC (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Sun, 3 Oct 2021 23:35:11 +0000; Speaking of "return", Jim: Take the Yaesu VX-5R (and, I presume those following that design). Yaesu properly treated the + DC line with ferrite, a common mode choke, and bypass caps, but did nothing; /archives//html/RFI/2021-10/msg00015.html (10,493 bytes)
317. Re: [RFI] RFI LG Refrig Corcom filter and #31 core (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Wed, 13 Oct 2021 18:43:43 +0000; If it ever becomes a problem, again, 43 material would better serve 10-meters than 31 material. The difference is small, but if needed, it could be useful. Dave - WØLEV -- *Dave - WØLEV* *Just Let Da; /archives//html/RFI/2021-10/msg00026.html (20,965 bytes)
318. Re: [RFI] Splatter from AM Radio Station WNTS Indianapolis and Resolution (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Mon, 25 Oct 2021 19:46:49 +0000; Long ago (in the early 1970's) and far away in Corona, California, I had a similar problem with a local rather low-budget station. The splatter was evident as high as 40-meters and "rather" nasty on; /archives//html/RFI/2021-10/msg00055.html (9,378 bytes)
319. Re: [RFI] For Hams too close to a AM station (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Tue, 26 Oct 2021 21:38:45 +0000; We have a blowtorch at 760kHz in Boulder, Colorado, only some 30 miles distant. I used Elsie to design a 1.7MHz HPF to get rid of the entire AM BCB. If you choose to build your own, have a look at th; /archives//html/RFI/2021-10/msg00069.html (8,471 bytes)
320. Re: [RFI] Splatter from AM Radio Station WNTS Indianapolis and Resolution (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Tue, 26 Oct 2021 22:07:07 +0000; A proper "ground" or earth connection is *not *necessary for proper and clean operation of an amateur radio station on HF ! ! In the past ARRL has spread this rumor so much that it's become conventio; /archives//html/RFI/2021-10/msg00074.html (14,712 bytes)

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