- 361. Re: [RFI] Hyperikon LED Tube Info (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Tue, 10 Nov 2020 20:52:54 +0000
- It is really hard to establish correlation with noise a few feet away from a noisy device and noise to a much more distant receive antenna. In many cases, if noise is coupled differentially onto the
- /archives//html/RFI/2020-11/msg00016.html (10,227 bytes)
- 362. Re: [RFI] Green Wire RFI (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Sun, 15 Nov 2020 22:51:58 +0000
- My propane water heater has a design that can vent to a PVC chimney. It has a blower motor that pumps room air into the exhaust to cool it. Naturally, it has an electrical connection. _______________
- /archives//html/RFI/2020-11/msg00037.html (9,264 bytes)
- 363. Re: [RFI] Difficult power line RFI find. (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Thu, 18 Mar 2021 07:06:38 +0000
- No chiding, but this does represent a good example of how some RFI problems can represent important maintenance issues. Even the neutral is not safe. If there is a problem with a transformer ground a
- /archives//html/RFI/2021-03/msg00045.html (25,901 bytes)
- 364. Re: [RFI] New Interference at kk0sd (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Wed, 24 Mar 2021 06:27:35 +0000
- There are a few things to remember about using a small loop for DFing on HF. For "point sources," such as a device in a home being heard from the street, small loops can work well. I remember years b
- /archives//html/RFI/2021-03/msg00106.html (39,841 bytes)
- 365. Re: [RFI] Ed Hare W1RFI Contact Info? (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Sat, 10 Apr 2021 18:58:39 +0000
- I will answer here, Tony. I was waiting to be able t give you a complete answer, but I will send you an email to let you know that we are still awaiting word from Solar Edge on what they are doing wi
- /archives//html/RFI/2021-04/msg00064.html (8,749 bytes)
- 366. [RFI] Wireless Power Transfer with electric vehicles (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Sat, 10 Apr 2021 19:21:20 +0000
- Oh, it's worse than the little Qi chargers, Jim. We are talking 20kW chargers for electric vehicles and ARRL and IARU are very concerned about harmonics and inverter noise. Right now, they are using
- /archives//html/RFI/2021-04/msg00066.html (8,403 bytes)
- 367. Re: [RFI] Wireless Power Transfer with electric vehicles (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Mon, 12 Apr 2021 14:57:09 +0000
- There would be no difference in kind between the power needs of wireless power transfer to charge electric vehicles as opposed to charging a car with a wired connection. I don't believe that the issu
- /archives//html/RFI/2021-04/msg00105.html (14,067 bytes)
- 368. Re: [RFI] Wireless Power Transfer with electric vehicles (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Mon, 12 Apr 2021 15:17:08 +0000
- The figure of 50% does not agree with what I have seen reported. If it were only 50%, the radiated field on the fundamental would be way over any limits and/or 10 kW of heat would be dissipated local
- /archives//html/RFI/2021-04/msg00106.html (9,824 bytes)
- 369. Re: [RFI] Wireless Power Transfer with electric vehicles (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Tue, 13 Apr 2021 12:30:57 +0000
- If every list becomes a free-for-all where people make off-topic posts because they think that they are important, the entire meaning of topical lists disappears and every list becomes a flamefest of
- /archives//html/RFI/2021-04/msg00132.html (11,864 bytes)
- 370. Re: [RFI] [External] Re: Wireless Power Transfer with electric vehicles (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Tue, 20 Apr 2021 12:11:19 +0000
- We can speculate, but the solar system on a given house is probably no more than 1% of the total mass and electronics present in that house over the decades the solar system will be in place, and its
- /archives//html/RFI/2021-04/msg00173.html (15,281 bytes)
- 371. Re: [RFI] Crepe Myrtle growing into power pole RFI Why? (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Tue, 25 May 2021 10:45:28 +0000
- This does explain some of the power-line noise that seems to peak on VHF, rather than be stronger the lower in frequency one tunes. Some of those cross arms that may hold up some of the wooden struct
- /archives//html/RFI/2021-05/msg00086.html (10,453 bytes)
- 372. Re: [RFI] SOLAR INSTALLATION PROS/CONS (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Tue, 25 May 2021 13:08:04 +0000
- It is unlikely that any contractor will accept a clause in a contract to perform something that the contractor does not know how to do. "Some of you guys must live in great places with lots of contra
- /archives//html/RFI/2021-05/msg00089.html (10,158 bytes)
- 373. Re: [RFI] ANOTHER "WITH LOVE, from CHINA" (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Wed, 14 Jul 2021 12:07:53 +0000
- So far, ofthe number ARRL has tested, only a handul of import bulbs bought from eBay sellers have exceeded FCC limits. Having said that, if a neighbor has a dozen bulbs operating at the limits, hams
- /archives//html/RFI/2021-07/msg00050.html (10,865 bytes)
- 374. [RFI] Lab Engineer EMC/RFI Specialist (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Fri, 23 Jul 2021 11:20:33 +0000
- ________________________________ Lab Engineer EMC/RFI Specialist-<http://www.arrl.org/employment-opportunities#> Job Title: Lab Engineer EMC/RFI Specialist Dept: Lab Report to: Lab Manager Job Catego
- /archives//html/RFI/2021-07/msg00068.html (13,282 bytes)
- 375. Re: [RFI] Line noise vs Frequency (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Sun, 8 Aug 2021 13:27:34 +0000
- Most of the time, sparking/arcing noise is louder at lower frequencies. This happens for two reasons -- the noise is stronger at lower frequencies and the long power lines that the noise gets coupled
- /archives//html/RFI/2021-08/msg00005.html (10,577 bytes)
- 376. Re: [RFI] Line noise vs Frequency (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Sun, 8 Aug 2021 16:47:22 +0000
- The most common effect is that rain or high humidity swells wood structures, tightening up hardware on the pole. The cause is pretty much secondary, because you aren't going to be able to fix it. Fin
- /archives//html/RFI/2021-08/msg00011.html (11,263 bytes)
- 377. Re: [RFI] Mystery noise (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Wed, 11 Aug 2021 19:21:08 +0000
- Switching regulators make noise ever N kHz, with N being the free running frequency of the internal circuitry. The noise can be almost a carrier to just broadband buzz every N kHz, with a 120- or may
- /archives//html/RFI/2021-08/msg00035.html (9,031 bytes)
- 378. Re: [RFI] Mystery noise (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Fri, 13 Aug 2021 17:30:30 +0000
- Every switcher that has caused me interference has been in my own home, but don't let on. If it ever got out that W1RFI had RFI, my reputation would be ruined. Great description. And when dozens of t
- /archives//html/RFI/2021-08/msg00050.html (9,519 bytes)
- 379. [RFI] What Is It vs Where Is It? (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Thu, 9 Sep 2021 12:22:54 +0000
- WHAT IS IT? By Ed Hare, W1RFI When someone has an unusual RFI problem, the first question he or she almost always asks is: What is it? That's an interesting question, and you may need to ask it durin
- /archives//html/RFI/2021-09/msg00006.html (17,116 bytes)
- 380. Re: [RFI] Working with Utilities (score: 1)
- Author: "Hare, Ed, W1RFI" <w1rfi@arrl.org>
- Date: Sat, 11 Sep 2021 15:02:58 +0000
- That is half of the equation. The lines are radiating, even on VHF, so what you need to do it to go across the street from the pole you think the source is. Do note that the noise gets stronger when
- /archives//html/RFI/2021-09/msg00018.html (11,204 bytes)
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