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301. Re: [RFI] wireless power transfer via 160M band (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Wed, 7 Feb 2018 19:42:47 +0000; Most of the systems I know of are adjusting the transmit frequency for maximum power transfer. This is somewhat dynamic, so the fundamental signal of these devices tends to wander a few kHz, making t; /archives//html/RFI/2018-02/msg00045.html (9,854 bytes)
302. Re: [RFI] 8 KHz spurs across much of amateur spectrum (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Tue, 13 Mar 2018 17:25:01 +0000; These are characteristics that typically identify a switch-mode power supply. 1. The noise is not uniform across an amateur band, but has peaks that occur every N kHz, with N typically being between; /archives//html/RFI/2018-03/msg00033.html (10,548 bytes)
303. Re: [RFI] (no subject) (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Thu, 7 Jun 2018 11:15:16 +0000; For most of us, our email addresses are public anyway. If you all google your email address, most of you will find it. They can get email addresses by buying them, by searching for them or even by ma; /archives//html/RFI/2018-06/msg00007.html (10,804 bytes)
304. Re: [RFI] Leased Solar Panels: Operator Responsibility? (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Wed, 27 Jun 2018 18:17:18 +0000; In general terms, those that can exert control over a system are the operators. This could include things like the ability to turn it off if interference occurs or even would probably be extended in; /archives//html/RFI/2018-06/msg00068.html (8,381 bytes)
305. Re: [RFI] Solar Panel RFI Video (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Mon, 13 Aug 2018 14:41:18 +0000; We have found Solar Edge to be receptive and interested in resolving the problems from their existing design. Keep in mind that the device is an unintentional emitter and as such, subject to conducte; /archives//html/RFI/2018-08/msg00001.html (9,948 bytes)
306. Re: [RFI] Solar Panel RFI Video (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Tue, 14 Aug 2018 20:52:24 +0000; I agree with Dave on this one; at least with respect to the solar systems being made by Solar Edge, a lawsuit is probably the last thing Amateur Radio wants to do. First, there is clear and existing; /archives//html/RFI/2018-08/msg00013.html (14,830 bytes)
307. Re: [RFI] FCC RFI Question (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Wed, 15 Aug 2018 16:09:39 +0000; One group of hams started to post RF-noisy locations on a Google map. Growers in that area did not want to appear on the map. For the crop usually grown, there is a 16-hour on/8-hour off lighting cyc; /archives//html/RFI/2018-08/msg00019.html (15,040 bytes)
308. Re: [RFI] FCC RFI Question (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Wed, 15 Aug 2018 17:49:40 +0000; It may depend who you contact. Hams that call the FCC toll-free number may be told that, but if Amateur Radio is mentioned, the case should be shuttled over to Laura Smith. Those that work with Laura; /archives//html/RFI/2018-08/msg00021.html (11,248 bytes)
309. Re: [RFI] Solar Panel RFI in Kings Park - Update October 4th 2018 (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Thu, 11 Oct 2018 18:03:23 +0000; Mike Gruber, I am thinking that we need to get out to that Connecticut Solar-Edge installation and make some 30 MHz radiated emissions measurements. The devices probably don't exceed the limits for A; /archives//html/RFI/2018-10/msg00007.html (15,620 bytes)
310. Re: [RFI] Solar Panel RFI in Kings Park - Update October 4th 2018 (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Thu, 11 Oct 2018 17:58:17 +0000; I doubt that the foam will do all that much. First, as you point out, the noise is probaby being radiated by the wires, not the box. Second, RF-absorber foam is usually not very effective at HF. It m; /archives//html/RFI/2018-10/msg00008.html (10,261 bytes)
311. Re: [RFI] Solar Panel RFI in Kings Park - Update October 4th 2018 (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Thu, 11 Oct 2018 20:09:38 +0000; Mike has been in communication with the Solar Edge engineers almost from the beginning, with some of the engineers in Israel. The "usual" solution has worked in some cases, while in other cases not.; /archives//html/RFI/2018-10/msg00013.html (11,215 bytes)
312. Re: [RFI] Signals on 160 (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Sun, 28 Oct 2018 19:54:17 +0000; "What is it?" is the wrong question. If someone said that it is a model Z-123 Netstuff modem, that really wouldn't help much. The real question is: "Where is it?" Finding the house or location where; /archives//html/RFI/2018-10/msg00034.html (9,049 bytes)
313. Re: [RFI] Signals on 160 (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Sun, 28 Oct 2018 21:47:44 +0000; I remember the wireless modem jacks on 3.53 MHz very well. What I learned in those days what that, for the most part, emissions from devices plugged in to house wiring exhibits two phenomena: 1. They; /archives//html/RFI/2018-10/msg00038.html (14,744 bytes)
314. Re: [RFI] Signals on 160 (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Sun, 28 Oct 2018 21:53:10 +0000; Most of the time, noise sources spaced 10 to 100 kHz apart are switching power supplies or similar devices. They exhibit the following characteristics: 1. The noise appears at intervals across a ban; /archives//html/RFI/2018-10/msg00039.html (13,439 bytes)
315. Re: [RFI] Investigating receive noise - got a few questions (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Mon, 12 Nov 2018 22:29:01 +0000; As ideal as it may sound to destroy every switcher, this is just not going to be a practical solution. Every electronic device in your home, from your LED bulbs to your TV and every modern appliance; /archives//html/RFI/2018-11/msg00045.html (18,302 bytes)
316. Re: [RFI] Investigating receive noise - got a few questions (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Mon, 12 Nov 2018 22:36:40 +0000; Depending on the grower, you'd either get them to shut it down, or shoot at you. What is legal on the state level is still not legal on the federal level and when it comes to enforcement, the current; /archives//html/RFI/2018-11/msg00046.html (14,268 bytes)
317. Re: [RFI] Update: LG washer WT1501CW - EMI (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Sun, 18 Nov 2018 15:20:05 +0000; The FCC has not generally tried to interpret things as appliances that are not. The devices are still subject to the requirement that the operator of the device not cause harmful interference. Ed, W1; /archives//html/RFI/2018-11/msg00068.html (11,730 bytes)
318. Re: [RFI] Update: LG washer WT1501CW - EMI (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Tue, 20 Nov 2018 21:03:25 +0000; Now, I am looking at the rules for categorical exemptions, and not every device that is an "industrial plant" would be categorically exempt. "A digital device used exclusively as an electronic contro; /archives//html/RFI/2018-11/msg00076.html (12,732 bytes)
319. Re: [RFI] 160 Meter RFI (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Thu, 6 Dec 2018 15:30:06 +0000; Switchers generally show the following characteristics: They create noise every N kHz over a broad frequency range, with N typically being 10 to 100 kHz. The may be on continuously, but may also come; /archives//html/RFI/2018-12/msg00022.html (11,644 bytes)
320. Re: [RFI] 160 Meter RFI (score: 1): Author: "Hare, Ed W1RFI" <w1rfi@arrl.org>; Date: Thu, 6 Dec 2018 16:00:44 +0000; Could that also be changes in the video scene being radiated? In general, the power supply will be rather hummy and its frequency may drift. When I heard a plasma TV, it was very stable with frequenc; /archives//html/RFI/2018-12/msg00025.html (13,511 bytes)

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