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161. Re: [RFI] RFI with Dish Network (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 22 May 2005 16:38:46 -0500
It is most likely common mode on the coax, in which case the RIGHT ferrite choke will work. Single ordinary snap-ons won't make a dent in it. They are designed for VHF, but you can turn them into HF
/archives//html/RFI/2005-05/msg00029.html (7,149 bytes)

162. Re: [RFI] RFI From Wireless Internet Radio (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 06 Jul 2005 12:24:16 -0500
I suspect that at least some of the trash may be common mode radiation from the Ethernet cables that connect it to the rest of your system, or to the DSL or cable modem, or both. There is an applicat
/archives//html/RFI/2005-07/msg00001.html (8,049 bytes)

163. Re: [RFI] RFI From Wireless Internet Radio (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 08 Jul 2005 09:30:24 -0500
it, Your description reinforces my suspicions that common mode radiation from the Ethernet cable is likely a major component of the problem. The trash is generated at both ends of the cable. Thus, th
/archives//html/RFI/2005-07/msg00003.html (8,530 bytes)

164. [RFI] Fwd: Three One-Day Advanced EMC Public Seminars offered byHenry Ott Consultants (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 14 Jul 2005 09:53:06 -0500
I just received this announcement of Henry Ott's fall public seminars. I attended last year's version, and enjoyed it immensely. Mr. Ott teaches in a clear and no-nonsense manner that is both rigorou
/archives//html/RFI/2005-07/msg00017.html (7,929 bytes)

165. Re: [RFI] Fwd: Three One-Day Advanced EMC Public Seminars offeredby Henry Ott Consultants (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Fri, 15 Jul 2005 09:25:58 -0500
And of the 1988 second edition that is the bible of everyone I know who can read and write EMC. An excellent text, and my favorite reference on EMC. BTW, Henry is WA2IRQ. Jim K9YC ___________________
/archives//html/RFI/2005-07/msg00019.html (7,503 bytes)

166. Re: [RFI] 14028 to 14034 hashbirdietrash (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 27 Jul 2005 21:34:06 -0500
this. 1. I am SURE that this IS Ethernet trash. 2. I believe it is 10BaseT traffic, which can occur on a 100BaseT connection if there are 10BaseT cards. Many cable modem and DSL modem outputs are 10B
/archives//html/RFI/2005-07/msg00034.html (9,502 bytes)

167. Re: [RFI] 14028 to 14034 hashbirdietrash (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 27 Jul 2005 23:51:04 -0500
In general, that will only work for one source at a time, because it nulls a specific direction and phase offset. Now, since each source is on its own frequency, if you have the patience to tweak eac
/archives//html/RFI/2005-07/msg00039.html (8,337 bytes)

168. Re: [RFI] 14028 to 14034 hashbirdietrash (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 28 Jul 2005 09:19:48 -0500
I agree with you completely! Jim K9YC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi
/archives//html/RFI/2005-07/msg00045.html (8,589 bytes)

169. Re: [RFI] 14028 to 14034 hashbirdietrash (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 06 Aug 2005 10:00:42 -0500
Frank, Why? You are beating a dead horse. You are hearing Ethernet traffic, radiated common mode from the Ethernet wiring, and directly from poorly shielded Ethernet gear. Jim Brown K9YC ____________
/archives//html/RFI/2005-08/msg00010.html (6,886 bytes)

170. Re: [RFI] 14028 to 14034 hashbirdietrash (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 09 Aug 2005 15:45:56 -0500
That should kill everything except what the boxes radiates due to poor shielding, and from their power leads. I wouldn't expect that to be a fix unless you use a lot better quality gear. The problem
/archives//html/RFI/2005-08/msg00019.html (8,818 bytes)

171. Re: [RFI] Power Line Ultrasound Detector (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 16 Aug 2005 15:18:23 -0500
At a hamfest this past weekend, I paid about $10 for a used 432 Yagi that is about 4 ft long and has a coax connector on it and a mast clamp on one end. That's pretty portable -- it wouldn't be to to
/archives//html/RFI/2005-08/msg00040.html (8,486 bytes)

172. Re: [RFI] GFI Outlets (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 17 Aug 2005 10:41:23 -0500
I wouldn't. I can run a KW on 160-10m into wire dipoles and long wires that are within 20 ft of several GFI's. When I first fired up the KW, one was constantly tripping, and eventually smoked. I repl
/archives//html/RFI/2005-08/msg00051.html (7,805 bytes)

173. Re: [RFI] BPL Propaganda, ARRL Rebuttal on NPR's Morning Edition (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 18 Aug 2005 16:53:30 -0500
As noted, a VERY effective rebuttal was read today on Morning Edition. So the local reporter, Wade Goodwin, who reported the story was hornswoggled, but at least NPR had the professionalism to choose
/archives//html/RFI/2005-08/msg00074.html (8,944 bytes)

174. Re: [RFI] Internet Cable interference (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Thu, 29 Sep 2005 07:39:37 -0500
I don't know about the +/- 61 kHz component, but the 14030 stuff is Ethernet-related, and is emitted by MANY devices that use Ethernet for their interconnection, including, but not limited to, cable
/archives//html/RFI/2005-09/msg00066.html (9,179 bytes)

175. [RFI] RFI and the electric company (score: 1)
Author: Mike Brown <k9mi@sbcglobal.net>
Date: Tue, 04 Oct 2005 03:45:08 +0000
I have had 3 problems with RFI from the electric lines in our neighborhood. Number 1, they were out the next day, and although it took maybe 3 months to fix, I was happy because they were at least tr
/archives//html/RFI/2005-10/msg00012.html (7,640 bytes)

176. [RFI] Toyota SUV's For Mobile? (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 30 Oct 2005 19:50:33 -0500
I'm thinking that I want to buy a Toyota Sequoia (an SUV on their Tundra truck frame) or Land Cruiser. Does anyone have HF mobile experience with either of these (or other big Toyotas or equivalent L
/archives//html/RFI/2005-10/msg00041.html (6,563 bytes)

177. Re: [RFI] Stereo/audio EMC question (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sun, 27 Nov 2005 12:58:26 -0600
Virtually ALL computer audio interfaces have massive pin 1 problems, and are thus open doors for common mode RF. In other words, those audio interface cables function as antennas, and the resulting R
/archives//html/RFI/2005-11/msg00013.html (8,122 bytes)

178. Re: [RFI] stereo/audio EMC (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 29 Nov 2005 00:35:43 -0600
That's part of my standard practice. Jim K9YC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi
/archives//html/RFI/2005-11/msg00016.html (6,977 bytes)

179. Re: [RFI] 160m sets off CO Detector (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Tue, 29 Nov 2005 00:40:54 -0600
Bad advice. Simple beads are useless below about 50 MHz. For a problem on 160m, you need a choke wound on the big #31 toroids discussed in my ferrite paper. http://audiosystemsgroup.com/publish And K
/archives//html/RFI/2005-11/msg00017.html (6,863 bytes)

180. Re: [RFI] 1996 Lincoln Town Car (score: 1)
Author: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Wed, 07 Dec 2005 08:28:50 -0600
One of my friends is chief engineer of a 50 kW clear channel AM. Their transmitter is in the far SW burbs of Chicago. He told me several years ago that he got lots of phone calls from owners of Fords
/archives//html/RFI/2005-12/msg00007.html (7,818 bytes)

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