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121. [RFI] re: It's the old story of peeling the onion -- (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 05 Dec 2004 17:47:47 -0600; Thanks for all of this excellent advice, and I can't find fault with any of it. It's part of the next layer of the onion in my shack. But I suspect that after taking care of my own dirty laundry, I'l; /archives//html/RFI/2004-12/msg00011.html (8,370 bytes)
122. RE: [RFI] re: It's the old story of peeling the onion -- (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 05 Dec 2004 22:43:43 -0600; I can't take credit for the onion analogy, but it is an excellent one. I think it might be from the late Dick Heyser, the father of Time Delay Spectrometry (TDS), whose "day job" was at Jet Propulsio; /archives//html/RFI/2004-12/msg00013.html (8,030 bytes)
123. Re: [RFI] Core for common-mode choke? (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 13 Dec 2004 21:59:47 -0600; I have several thoughts. First, you left out some very important information about your problems. It is impossible to consider the design of any filtering without knowing the answers to both of those; /archives//html/RFI/2004-12/msg00016.html (9,233 bytes)
124. [RFI] RE: Topband: FT-240-77 Toroid Impedance R + jX Components (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 03 Jan 2005 17:18:51 -0600; The difference is that the Fair-Rite curves you are looking at are for different materials that have peaks at much higher frequencies. My data and Michael's data correlate quite well, and my data has; /archives//html/RFI/2005-01/msg00003.html (7,088 bytes)
125. [RFI] Fwd: Re: [TenTec] RE 28.634 (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 06 Jan 2005 09:38:55 -0600; Gentlemen, The following post from the TenTec reflector is interesting because it illustrates the obvious need for a list of common "birdie" frequencies and the equipment that produces them. I've edi; /archives//html/RFI/2005-01/msg00006.html (10,710 bytes)
126. Re: [RFI] Buying a new TV (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 11 Jan 2005 08:37:16 -0600; That is true. And selling them for residential use is a violation of FCC rules. But thanks to our downsized Federal government, FCC rules don't get enforced. Thank you, Mr. Reagan. Jim Brown K9YC ___; /archives//html/RFI/2005-01/msg00012.html (7,545 bytes)
127. Re: [RFI] TVI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 12 Jan 2005 09:01:19 -0600; I've been doing considerable research on that, and can offer this advice. The Fair-Rite 2.4" O.D. toroids are listed in the catalog with #43, #78, and #61. I've also just received (and measured) samp; /archives//html/RFI/2005-01/msg00021.html (7,748 bytes)
128. RE: [RFI] TVI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 12 Jan 2005 22:07:14 -0600; 5931003801 In this part number, 59 signifies a toroid, 31 the material, 003801 signifies the toroid that is 2.4" O.D. x 1.4" I.D. x 0.5" L. I concur with those who suggested (on another list) going t; /archives//html/RFI/2005-01/msg00024.html (7,306 bytes)
129. Re: [RFI] Washing machine RFI question (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 18 Jan 2005 22:05:31 -0600; The good news is that if it trashes the TV, it most likely violates Part 15. That should give you and the other guy with the problem a bigger hammer to get it fixed. Jim Brown K9YC __________________; /archives//html/RFI/2005-01/msg00033.html (7,531 bytes)
130. [RFI] High Power Wi-Fi (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 21 Jan 2005 21:22:20 -0600; I just returned from a computer store where I saw a crop of "high power" Wi-Fi routers and PCCard interfaces. The routers claimed 200 mW and has removable antennas (SMA's, I think). The PCCards were; /archives//html/RFI/2005-01/msg00040.html (6,803 bytes)
131. Re: [RFI] Ethernet RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sat, 22 Jan 2005 19:31:15 -0600; See this link to a new applications note on my website about how to use ferrite chokes to kill stuff like this. This one is geared toward keeping RF out of audio, but the physics is exactly the same.; /archives//html/RFI/2005-01/msg00047.html (9,335 bytes)
132. Re: [RFI] Ethernet RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sat, 22 Jan 2005 21:40:59 -0600; You'd better go for a paycheck loan, Ford. :) You (and the tutorial) are absolutely correct that a twisted pair helps TREMENDOUSLY in killing DIFFERENTIAL mode coupling to/from the cable. And we have; /archives//html/RFI/2005-01/msg00053.html (8,268 bytes)
133. RE: [RFI] Ethernet RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 23 Jan 2005 15:15:19 -0600; Not only is correct wiring critical for EMC, it is also quite critical for performance as an Ethernet cable. Understand this basic concept. A CAT5 cable (or CATx, for that matter) consists of FOUR TW; /archives//html/RFI/2005-01/msg00064.html (9,514 bytes)
134. Re: RE: [RFI] Ethernet RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 23 Jan 2005 22:33:02 -0600; transmission test set" test by just eyeballing the RJ45s on each end and making sure the proper color code for the wires was followed. That is, assuming the cable is good quality. If your eyes were g; /archives//html/RFI/2005-01/msg00068.html (8,762 bytes)
135. RE: RE: [RFI] Ethernet RFI (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 24 Jan 2005 08:59:47 -0600; I don't consder myself an expert on this at all, but will offer these thoughts. 1) The shorter any wire is, the less likely it is to couple RF from your rig to the equipment, especially at HF. So fro; /archives//html/RFI/2005-01/msg00071.html (10,417 bytes)
136. Re: [RFI] Far Field, Near Field (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 25 Jan 2005 08:16:52 -0600; Agreed on all counts. Jim Brown K9YC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi; /archives//html/RFI/2005-01/msg00076.html (6,946 bytes)
137. Re: [RFI] Ethernet RFI and connector wiring (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 31 Jan 2005 01:23:21 -0600; No surprise -- it's common mode radiation, NOT differential mode! Jim Brown K9YC _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailma; /archives//html/RFI/2005-01/msg00086.html (7,536 bytes)
138. Re: [RFI] HF Mobile Installation in 2001 Mazda (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 04 Feb 2005 13:06:11 -0600; On Fri, 04 Feb 2005 10:30:31 -0800, digital-conjurers@adelphia.net wrote: Unlikely if you follow good engineering practice. 1) Get your power directly from the battery ( both positive and negative).; /archives//html/RFI/2005-02/msg00009.html (8,653 bytes)
139. Re: [RFI] HF Mobile Installation in 2001 Mazda (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 04 Feb 2005 17:48:15 -0600; You're thinking resistance, not inductance or loop area. When you get the power via the closely paired cable (even better if it's twisted), you minimize the loop area of any issues with RF on that po; /archives//html/RFI/2005-02/msg00011.html (7,847 bytes)
140. Re: [RFI] HF Mobile Installation in 2001 Mazda (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 04 Feb 2005 18:36:30 -0600; Because the question was about whether he would have problems with the on-board computers. The lower the impedance of the power connection at RF, the less likely that is to occur. If the only connect; /archives//html/RFI/2005-02/msg00013.html (7,607 bytes)

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