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261. Re: [RFI] CO Detector (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 15 Feb 2007 22:21:41 -0800; This is all a red herring, and meant to suggest that the ham might be at fault. When smoke detectors detect RF instead of smoke, the root cause is a problem with the detector, not the radio transmitt; /archives//html/RFI/2007-02/msg00045.html (8,578 bytes)
262. Re: [RFI] Choosing Snap-On Toroid for 6M? (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 19 Feb 2007 13:48:37 -0800; Yes. If you study the data, the small air gap of the clamp-ons is mostly a factor at lower frequencies, but no big deal at higher frequencies. But the clamp-ons are about twice the cost for equivalen; /archives//html/RFI/2007-02/msg00055.html (9,051 bytes)
263. Re: [RFI] Computer Hash (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 25 Feb 2007 23:20:14 -0800; out Take a look at the RFI tutorial on my website. http://audiosystemsgroup.com/RFI-Ham.pdf Some questions: 1) Does the noise go away (or get weaker) if you disconnect some or all of the wires plugge; /archives//html/RFI/2007-02/msg00062.html (8,160 bytes)
264. Re: [RFI] HIGH POWER and RFI... (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 05 Mar 2007 08:43:51 -0800; It is VERY important that you make you neighbor understand that THIS is the cause of his problem, not your station. He would have the same problem if he lived near any other transmitter, like a broad; /archives//html/RFI/2007-03/msg00001.html (8,136 bytes)
265. Re: [RFI] HIGH POWER and RFI... (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 05 Mar 2007 19:18:26 -0800; I spent a month writing the tutorial referenced in the previous post (and three years doing the research on ferrites). A good starting place for you and others with this kind of problem would be to s; /archives//html/RFI/2007-03/msg00003.html (6,859 bytes)
266. Re: [RFI] Cordless 5.8ghz phones (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 14 Mar 2007 10:50:06 -0800; Yes. Telephones are notorious for receiving RFI because of their poor design. The K-Com filters are known to work on the RF coupled from the phone line. Google to find them. Yes. And you may find tha; /archives//html/RFI/2007-03/msg00008.html (7,197 bytes)
267. Re: [RFI] Very nasty noise (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 19 Mar 2007 11:00:35 -0700; Perhaps a battery charger for someone's new drill, mobility cart, etc. Jim K9YC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman; /archives//html/RFI/2007-03/msg00019.html (6,595 bytes)
268. Re: [RFI] Variable speed drives (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 27 Mar 2007 08:35:39 -0700; On Tue, 27 Mar 2007 09:36:38 -0500, dgsvetan@rockwellcollins.com wrote: Yes. We occasionally run into big problems with VFD's in pro audio installations, where they are used for elevators, HVAC syste; /archives//html/RFI/2007-03/msg00031.html (8,587 bytes)
269. Re: [RFI] Solar Arrays, etc. (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 07 May 2007 02:56:19 -0700; YES! AE6RF, a neighbor of mine, is currently attempting to beat his neighbor's solar system into submission. One potential cause is an current impulsing system designed to prevent degradation of the; /archives//html/RFI/2007-05/msg00001.html (6,742 bytes)
270. Re: [RFI] Noisey PSU (Laptop) on HF Decodeing (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 29 May 2007 17:57:23 -0700; I own five IBM T-series laptops (T20, T21, T22, T41), and none of the power supplies have RFI issues. In Chicago, I used them within a few yards of receiving antennas. Here in CA, I've got a lot more; /archives//html/RFI/2007-05/msg00064.html (8,696 bytes)
271. Re: [RFI] Noisey PSU (Laptop) on HF Decodeing (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 29 May 2007 20:52:04 -0700; Don't count on that being a factor -- a 2.4GHz antenna is VERY unlikely to be big enough to couple RFI from your ham station to any place it can get detected unless you're on 2.4 GHz, and then it wou; /archives//html/RFI/2007-05/msg00066.html (7,898 bytes)
272. Re: [RFI] Was RFI from Astron power supply (score: 1): Author: Michael Brown <k9mi@yahoo.com>; Date: Sat, 9 Jun 2007 08:05:08 -0700 (PDT); What happens when you remove the antenna from the radio? 73, Mike K9MI A local electrical company here ran a deticated outlet for the power supply. I had 40 s-units of noise with the old outlet and 3; /archives//html/RFI/2007-06/msg00004.html (8,839 bytes)
273. Re: [RFI] Was RFI from Astron power supply (score: 1): Author: Michael Brown <k9mi@yahoo.com>; Date: Sat, 9 Jun 2007 10:36:24 -0700 (PDT); I guess I should have clarified that as "coax" as you wouldn't want to go taking an antenna down for no good reason. Is the noise you hear like a frying sound, or static, or??? If you can take the co; /archives//html/RFI/2007-06/msg00006.html (7,570 bytes)
274. Re: [RFI] Long distance grounding (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 14 Jun 2007 17:55:01 -0700; Computer systems, especially sound cards, but also serial ports, are notorious for being built with "pin 1 problems." A connection to earth is rarely a fix for RFI. Proper shield termination is. See; /archives//html/RFI/2007-06/msg00016.html (8,363 bytes)
275. Re: [RFI] TVI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 20 Jun 2007 21:03:19 -0700; Sure. Lousy shielding is a common problem and possible culprit. In other words, it could be picked up on the wiring within the TV. That means replacing the TV. However: It still might be coming in on; /archives//html/RFI/2007-06/msg00020.html (7,137 bytes)
276. Re: [RFI] N6CW TVI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 22 Jun 2007 10:07:50 -0700; I agree with ALL of Tom's comments, including his bonding recommendations for TV antennas (and cable TV lead-ins) and about his comments on filters. That bonding will certainly divert any common mode; /archives//html/RFI/2007-06/msg00029.html (10,099 bytes)
277. Re: [RFI] N6CW TVI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 22 Jun 2007 22:01:58 -0700; You are correct, it IS irrelvant. Of course! The proximity that counts is ANTENNAS to the victim equipment, and WIRING for the victim equipment. Jim Brown K9YC ______________________________________; /archives//html/RFI/2007-06/msg00032.html (7,150 bytes)
278. Re: [RFI] N6CW TVI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 24 Jun 2007 21:38:43 -0700; Plugging and unplugging a cable does THREE very important (and very different) things. First, it removes one device from a circuit. Second, it removes a current path for noise current that may be flo; /archives//html/RFI/2007-06/msg00038.html (9,390 bytes)
279. Re: [RFI] Ethernet Extenders (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 25 Jun 2007 09:16:57 -0700; The problem is only on 40M and 30M. This tells us that it is NOT a grounding problem, nor is it related to noise or the grounding between buildings. The most likely cause is that some wiring is actin; /archives//html/RFI/2007-06/msg00044.html (8,636 bytes)
280. Re: [RFI] Ethernet Extenders (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 25 Jun 2007 12:14:00 -0700; Are you saying that you have this problem transmitting into a dummy load? Hmmm. Maybe RFI in either the 480 or the box that talks to it. Ferrite choke there? Maybe even a software problem, and not an; /archives//html/RFI/2007-06/msg00048.html (10,289 bytes)

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