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141. Re: [RFI] Whirlpool Duet Washing Machine RFI update (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 11 Feb 2005 13:33:44 -0600; But they still must comply with Part 15. I would insist that THEY do the work that it takes to do that. If there is resistance, I would tell them that your next call is to the FCC. Jim Brown K9YC ___; /archives//html/RFI/2005-02/msg00044.html (7,463 bytes)
142. Re: [RFI] Whirlpool Duet Washing Machine RFI update (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sat, 12 Feb 2005 01:05:13 -0600; Yes, but I'm guessing that it may not conform to Part 15 emissions for Class B. FWIW, variable frequency drives are known to be problematic with audio systems, and it may be due to magnetic fields es; /archives//html/RFI/2005-02/msg00051.html (9,855 bytes)
143. Re: [RFI] rf and insulin pumps (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 13 Feb 2005 22:11:36 -0600; I would take a WAG (wild-assed guess) and say that it's on a VHF TV channel. My understanding is that medical devices have been there for some years. I know they had to do a mad scramble in the Dalla; /archives//html/RFI/2005-02/msg00064.html (7,273 bytes)
144. Re: [RFI] Visit from the power company (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 16 Feb 2005 17:07:29 -0600; Can't imagine why, other than Murphy's law. :) On the other hand, consider yourself lucky -- the new stuff may result in less noise if the old stuff was arcing! Jim Brown K9YC _______________________; /archives//html/RFI/2005-02/msg00074.html (7,047 bytes)
145. Re: [RFI] DSL surge protection (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 24 Feb 2005 13:33:03 -0600; I suggest that you consider the networking hardware as sacrificial --it's all cheap gear and from what you say, difficult to protect while still working well -- and pay more attention to damage to co; /archives//html/RFI/2005-02/msg00077.html (7,804 bytes)
146. Re: [RFI] FCC fines station for exceeding RF field strength limits(andother things) (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 27 Feb 2005 13:24:34 -0600; Yeah, but $25K doesn't even qualify as a slap on the wrist! Jim Brown _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/; /archives//html/RFI/2005-02/msg00098.html (7,339 bytes)
147. Re: [RFI] super transformer dimmer (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 20 Mar 2005 18:34:06 -0600; You need to know a lot more about a filter than this to judge its effectiveness. Jim Brown K9YC Inductance 3.3 mH. _______________________________________________ RFI mailing list RFI@contesting.com; /archives//html/RFI/2005-03/msg00042.html (7,521 bytes)
148. Re: [RFI] Blackberry interference with conference room audio systems (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 21 Mar 2005 12:32:24 -0600; I strongly agree Eddie. I have done considerable research in this area, all of it on my own nickel. That's part of my investment in my business. I've also published much of it, making available to ha; /archives//html/RFI/2005-03/msg00051.html (9,182 bytes)
149. Re: [RFI] Honda Generator RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 22 Mar 2005 18:47:03 -0600; A good commercial line filter at the generator is probably be a good idea. Not all are created equal, so study the specs carefully. You want to ground the filter to the generator with very short lead; /archives//html/RFI/2005-03/msg00063.html (7,563 bytes)
150. Re: [RFI] Honda Generator RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 23 Mar 2005 08:49:25 -0600; While balancing the load between the legs is a good thing, especially in 120/240V systems, I doubt that it has much, if anything, to do with RFI. Jim Brown K9YC ______________________________________; /archives//html/RFI/2005-03/msg00066.html (7,354 bytes)
151. Re: [RFI] Honda Generator RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 23 Mar 2005 09:40:44 -0600; Yes Good. The ground should probably NOT have a toroid on it. Do you have my Power/Grounding white paper? If not, grab it off my website. There must be ONE, AND ONLY ONE, bond between neutral and gro; /archives//html/RFI/2005-03/msg00070.html (11,391 bytes)
152. Re: [RFI] Honda Generator RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 23 Mar 2005 10:18:27 -0600; "Short The word "probably" in my reply is based on the potential for a conflict between safety grounding and RFI suppression. You MUST bond all grounds within an installation for safety, but these co; /archives//html/RFI/2005-03/msg00073.html (10,221 bytes)
153. Re: [RFI] Honda Generator RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 23 Mar 2005 11:07:53 -0600; What magnetics are being saturated, and how? If all the currentcarrying conductors are going through the ferrite choke, the net field is limited to the common-mode current, which ought to be the nois; /archives//html/RFI/2005-03/msg00076.html (9,004 bytes)
154. Re: [RFI] Honda Generator RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 23 Mar 2005 12:06:13 -0600; Immediately adjacent to the service panel would be my choice. And following W8JI's advice, I would try to route the antennas through that common point and bond them (and their protection devices) the; /archives//html/RFI/2005-03/msg00078.html (9,894 bytes)
155. Re: [RFI] Honda Generator RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 23 Mar 2005 13:04:48 -0600; Sorry, brain cramp. I had forgotten we were talking about 120/240 as opposed to 120. Yes, both phases and the neutral need to go through the choke if the resultant field is to be small. Jim _________; /archives//html/RFI/2005-03/msg00080.html (8,826 bytes)
156. Re: [RFI] Honda Generator RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 23 Mar 2005 17:43:31 -0600; The #31 material is relatively new. It is available in some sizes and configurations, but not all. The parts that W4EF and I have tested are experimental parts, and not in the catalog yet. In the Fai; /archives//html/RFI/2005-03/msg00087.html (9,535 bytes)
157. Re: [RFI] Honda Generator RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 24 Mar 2005 08:49:22 -0600; See my email from yesterday on this, Mike, when I ran through what could happen with impedance added to the ground. The issue is lightning protection, and the impedance that gets you common mode nois; /archives//html/RFI/2005-03/msg00095.html (9,609 bytes)
158. Re: [RFI] Lutron Eco-10 Fluorescent dimming ballast? (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 14 Apr 2005 14:42:05 -0500; Several thoughts. 1) Part 18 is a joke for emissions. 2) Electronic dimmers work by chopping at some frequency at roughly 40-60 kHz, and I would expect them to be dogs for HF RFI. Expect lots of harm; /archives//html/RFI/2005-04/msg00009.html (8,751 bytes)
159. Re: [RFI] RFI and Hybrid vehicles - What are MFRs afraid of ? (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 05 May 2005 08:23:49 -0500; hybrid Several thoughts. 1. On what legal grounds do they have the right to do so? You bought it, it's yours. 2. If their warranty forbids it without having disclosed that prior to sale, it seems to; /archives//html/RFI/2005-05/msg00004.html (8,105 bytes)
160. [TowerTalk] Cellular Base Station Power Levels (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 12 May 2005 10:40:30 -0500; For an "RFI for audio guys" applications note I am writing, I would like to know the approximate transmit power levels for cellular base stations. I'm guessing around 100w ERP on peaks? Jim Brown K9Y; /archives//html/RFI/2005-05/msg00024.html (6,855 bytes)

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