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241. Re: [RFI] 40M TVI problem (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 13 Nov 2006 09:50:42 -0700; http://audiosystemsgroup.com/publish See the tutorials, with measured data, for ferrite chokes in several common and useful configurations at the link above. What you probably need is a choking Z of; /archives//html/RFI/2006-11/msg00031.html (7,252 bytes)
242. Re: [TowerTalk] [RFI] Haolgens AND . . . (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 20 Nov 2006 12:02:24 -0800; I have the same experience with really nasty switching power supplies for LV lighting fixtures in the house I bought here in CA. Where do you buy them? Can you tell us pecific mfrs and/or part number; /archives//html/RFI/2006-11/msg00067.html (8,437 bytes)
243. Re: [RFI] RFI/EMI MAJOR Problems (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 29 Nov 2006 22:59:13 -0800; I disagree. N3OX was right on target -- the wire that you are calling "ground" is part of the antenna, and it's carrying the full the antenna current and is radiating into your home equipment. Reson; /archives//html/RFI/2006-11/msg00087.html (10,393 bytes)
244. Re: [RFI] Philips Energy Saving Bulbs? (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 04 Dec 2006 06:09:34 -0800; CA electrical rates are VERY high (a graduated scale that works out to be roughly 3X what I paid in Chicago for the same kWh). My first electricity bills put me in serious energy efficiency mode, and; /archives//html/RFI/2006-12/msg00006.html (8,259 bytes)
245. Re: [RFI] ROAD RUNNER CABLE INTERNET SERVICE RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 07 Dec 2006 08:49:02 -0800; I have cable internet service from Comcast here in CA, and had it in Chicago from another vendor. It works fine here, and worked fine in Chicago -- most of the time. But I switched to a DSL service i; /archives//html/RFI/2006-12/msg00020.html (7,950 bytes)
246. Re: [RFI] Low voltage lighting solid state "transformers" (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 17 Dec 2006 08:23:10 -0800; I have a half dozen or so of these little monsters in the home I bought in CA. I've done some things to suppress them, with varying degrees of success. The problem is physical space to mount either t; /archives//html/RFI/2006-12/msg00029.html (10,201 bytes)
247. Re: [RFI] Low voltage lighting solid state "transformers" (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 17 Dec 2006 13:04:00 -0800; I doubt it. The AC wiring between the noise source and the filter will act as an antenna, and in a typical building, is likely to be long enough to be a pretty effective radiator on the HF bands. Now; /archives//html/RFI/2006-12/msg00033.html (9,100 bytes)
248. Re: [RFI] Low voltage lighting solid state "transformers" (long) (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 19 Dec 2006 10:08:14 -0800; Thanks for the link. In addition to this one, they also list model WN 30913, which is a toroidal transformer rated at 50 watts. Retail is listed at $76. The problem is that this part probably won't f; /archives//html/RFI/2006-12/msg00048.html (8,405 bytes)
249. Re: [RFI] New Noise on 80 m (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 04 Jan 2007 10:21:46 -0800; Chasing RFI can be a bit like Sherlock Holmes detective work. Think of what equipment might have been purchased (or received as a gift) at Christmas and used during the evening. Some common RFI sourc; /archives//html/RFI/2007-01/msg00002.html (6,857 bytes)
250. Re: [RFI] Strange radio static problem in vehicle (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 15 Jan 2007 16:56:43 -0800; Chassis bonding in some contemporary vehicles is really poor (or non-existent). The body of my 2006 Toyota Sequoia (large SUV, based on big Tundra pickup) has really awful electrical integrity. It's; /archives//html/RFI/2007-01/msg00006.html (7,302 bytes)
251. Re: [RFI] N6TR JA noise update (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 25 Jan 2007 10:26:07 -0800; VHF noise can be easier to pinpoint, because the strongest radiation tends to be from wires much closer to the source. Driving/walking around with a talkie or mobile VHF rig MIGHT help you zero in on; /archives//html/RFI/2007-01/msg00018.html (6,942 bytes)
252. Re: [RFI] Help on speed drive motor controller RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 28 Jan 2007 14:38:55 -0800; You won't get rid of them -- they are far too closely integrated into the design of the unit. You MAY be able to reduce the RF trash a lot. I suggest that you download and study the tutorial on RFI t; /archives//html/RFI/2007-01/msg00023.html (8,907 bytes)
253. Re: [RFI] Help on speed drive motor controller RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 29 Jan 2007 08:43:33 -0800; I don't think Tom was attempting to disagree with you or me, but rather to add the benefit of his direct experience to the discussion. And it shows pretty clearly that we're all in agreement on this; /archives//html/RFI/2007-01/msg00028.html (7,731 bytes)
254. Re: [RFI] DSL INTERFERENCE FROM 160 METERS (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 06 Feb 2007 21:01:46 -0800; 14 turns of the phone cable around a Fair-Rite #31 2.4" o.d. toroid (the shape commonly called FT-240) makes a very effective common mode choke at 2 MHz. For more details, see the tutorial on my webs; /archives//html/RFI/2007-02/msg00011.html (7,588 bytes)
255. Re: [RFI] RFI to clock radio (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 07 Feb 2007 09:16:07 -0800; Several questions/answers. 1) The long wire probably has something approaching a current maxima near the transmitter, which establishes a very strong magnetic field around it. Since this is also clos; /archives//html/RFI/2007-02/msg00014.html (8,595 bytes)
256. Re: [RFI] Hyperlan interference (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 09 Feb 2007 08:55:00 -0800; If you're right, what you need are common mode ferrite chokes on the LAN cables that are connecting the RF link to your Ethernet system (and maybe the power supply). Don't be too sure that you are ri; /archives//html/RFI/2007-02/msg00018.html (7,264 bytes)
257. Re: [RFI] New to the list - searching for 80 meters noise (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 11 Feb 2007 15:30:28 -0800; Don't worry about the ENTIRELY SELF-CONTAINED solar powered lights that typically are a single LED (or two), with a solar cell on top and a pair of AA's inside. These are harmless. You're looking for; /archives//html/RFI/2007-02/msg00025.html (8,209 bytes)
258. Re: [RFI] All band handheld receivers (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 11 Feb 2007 16:08:08 -0800; My VHF/UHF talkie, a Yaesu TH-F6A, also includes a general coverage receiver, and a built-in loopstick that is the default antenna below 10 MHz. It's not very sensitive, but that's not always a bad t; /archives//html/RFI/2007-02/msg00027.html (7,957 bytes)
259. Re: [RFI] New to the list - searching for 80 meters noise (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 12 Feb 2007 15:50:33 -0800; Keep at it with your AM radio, preferably tuned to the very top of the band, which will hopefully be more representative of 80M. Jim K9YC _______________________________________________ RFI mailing l; /archives//html/RFI/2007-02/msg00035.html (8,442 bytes)
260. Re: [RFI] Hyperlan interference (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 14 Feb 2007 05:30:51 -0800; No, because that's probably not how the RFI is probably is being coupled. I have no idea. I suggest that you study my tutorial on RFI to understand the likely coupling mechanisms. Hopefully that will; /archives//html/RFI/2007-02/msg00039.html (7,315 bytes)

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