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221. Re: [RFI] Ut oh. VisionSolar is parked next door. (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Wed, 16 Dec 2020 19:16:35 +0000; I have been solicited by telephone several times for solar power. When we had this house build, it was an option, but the ROI (we're 73 - my wife - and 74 - me) did not play out with the hard numbers; /archives//html/RFI/2020-12/msg00043.html (12,020 bytes)
222. Re: [RFI] Ut oh. VisionSolar is parked next door. (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Thu, 17 Dec 2020 00:19:03 +0000; Tony: This is a bit similar to the time switching mode power supplies hit the designers bag of tricks (early to mid 1970's??). Sure, more efficient, but a year or so later, the pages of EE Times and; /archives//html/RFI/2020-12/msg00050.html (13,344 bytes)
223. Re: [RFI] Ut oh. VisionSolar is parked next door. (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Thu, 17 Dec 2020 03:07:04 +0000; Three cases in 200? That's 0.015 % of cases. I'd put that as irresponsive. I've been a licensed amateur radio operator for going on 61 years. I have a relatively good RF lab. I know how to use the eq; /archives//html/RFI/2020-12/msg00053.html (11,812 bytes)
224. Re: [RFI] Ut oh. VisionSolar is parked next door. (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Thu, 17 Dec 2020 18:18:32 +0000; Might well work! And, further, this could *not* be construed by the FCC as "malicious interference". When solar begins to interfere with FAA, public service, emergency responders, hospitals, John Law; /archives//html/RFI/2020-12/msg00069.html (10,231 bytes)
225. Re: [RFI] Ut oh. VisionSolar is parked next door. (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Fri, 18 Dec 2020 00:01:58 +0000; 41 years and counting, here, Dave. And her comment looking at my shelf of ham radio equipment (and test equipment): "Don't you have it all?" Well, I do believe I've bought my last HF radios with the; /archives//html/RFI/2020-12/msg00076.html (10,977 bytes)
226. [RFI] RFI QUESTION (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Tue, 22 Dec 2020 00:02:29 +0000; I'm out of ideas on this one! Where does the raspy modulation come from on the harmonics which changes with position in my radio room on a battery operated receiver? Situation: transmit on 7.010 MHz; /archives//html/RFI/2020-12/msg00099.html (7,516 bytes)
227. [RFI] QUESTION (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Tue, 22 Dec 2020 00:05:02 +0000; I'm out of ideas on this one! Where does the raspy modulation come from on the harmonics which changes with position in my radio room on a battery operated receiver? Situation: transmit on 7.010 MHz; /archives//html/RFI/2020-12/msg00100.html (7,617 bytes)
228. Re: [RFI] QUESTION (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Wed, 23 Dec 2020 00:24:28 +0000; Yes, indeed. A Merry and Blessed Christmas and rewarding New Year to everyone on the group. May all the Solar Power Installation near you all mysteriously cease operation for the new year Dave - WØLE; /archives//html/RFI/2020-12/msg00112.html (9,996 bytes)
229. Re: [RFI] QUESTION (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Wed, 23 Dec 2020 01:20:49 +0000; I couldn't agree more with you more, Dave. But we, as amateur radio operators, have little say with FCC. Money is required to get the attention of FCC these days. Lots of it!!! Clean installations ca; /archives//html/RFI/2020-12/msg00114.html (12,274 bytes)
230. [RFI] TEST (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Mon, 28 Dec 2020 00:19:40 +0000; Do not reply. This is only a test. Dave - WØLEV _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi; /archives//html/RFI/2020-12/msg00119.html (6,606 bytes)
231. Re: [RFI] Pole mounted lightning arresters? (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Mon, 11 Jan 2021 20:58:17 +0000; Using both the MFJ offering for the purpose (VHF) and a 0.5-Meter shielded loop coupled to a small battery-operated radio tuned to the peak frequency of the emissioin, a faulty lightning arrestor was; /archives//html/RFI/2021-01/msg00039.html (12,130 bytes)
232. Re: [RFI] Fwd: Re: Pole mounted lightning arresters? (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Tue, 12 Jan 2021 00:00:00 +0000; You can make a shielded loop easily. The null is extremely sharp perpendicular to the plane of the loop. Dave - WØLEV -- *Dave - WØLEV* *Just Let Darwin Work* ________________________________________; /archives//html/RFI/2021-01/msg00047.html (8,960 bytes)
233. Re: [RFI] New RFI (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Tue, 12 Jan 2021 18:41:42 +0000; Most recently, I have isolated a source on a power pole by using both the MFJ device AND a home brew 0.5-meter shielded loop connected to a battery-powered receiver tuned to the frequency of maximum; /archives//html/RFI/2021-01/msg00063.html (11,017 bytes)
234. Re: [RFI] RFI Measurements (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Thu, 21 Jan 2021 00:03:37 +0000; I've been on a common mode choke (CMC) 'march' for about 6-months with good HP equipment to measure my 'creations'. My set of HF wires consists of a 450-foot long doublet fed with open wire. I ran an; /archives//html/RFI/2021-01/msg00098.html (10,406 bytes)
235. Re: [RFI] New RFI (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Fri, 22 Jan 2021 22:52:28 +0000; In working with our STEM students last year (before COVID), I ran into the same problem in using online Yagi designers. User beware on ALL these online antenna designers!!! I don't know where they ca; /archives//html/RFI/2021-01/msg00114.html (15,670 bytes)
236. Re: [RFI] RFI Question (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Fri, 12 Feb 2021 18:46:34 +0000; The phenomenon is well known as resonant excitation. Hit a bell with the clapper. The impulse of the clapper hitting the inside wall of the bell theoretically contains all frequencies. The structure; /archives//html/RFI/2021-02/msg00014.html (9,781 bytes)
237. Re: [RFI] RFI Question (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Fri, 12 Feb 2021 21:02:11 +0000; I'll cease with this last example. Having once played the pipe organ, the organ pipe is also a good example of resonant excitation. The wind blown into the bottom of each pipe is pretty much white, a; /archives//html/RFI/2021-02/msg00017.html (12,836 bytes)
238. Re: [RFI] FM modulated RFI on 3.885 and more (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Sun, 14 Feb 2021 21:47:19 +0000; This goes back a few decades, but there were once several products that turned your house wiring into data lines (early Ethernet). They operated on 80-meters. They could easily be 'disabled' by runni; /archives//html/RFI/2021-02/msg00019.html (9,714 bytes)
239. Re: [RFI] Fw: Central Air recos (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Wed, 10 Mar 2021 18:21:14 +0000; I have Carrier - not my choice, but..... It does not produce any RFI. No variable speed control on any of the motors in the unit or in the furnace where the house HVAC fan is located. Be sure to avoi; /archives//html/RFI/2021-03/msg00028.html (7,582 bytes)
240. Re: [RFI] FW: Pacemaker and RFI (score: 1): Author: David Eckhardt <davearea51a@gmail.com>; Date: Wed, 17 Mar 2021 16:53:30 +0000; We have Medtronic in Boulder, Co. I and others I know have done EMI/RFI work for them. I can assure you they have a robust department that addresses such concerns. Contact them. I'm sure you will get; /archives//html/RFI/2021-03/msg00041.html (8,813 bytes)

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