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101. Re: [RFI] Ferrite Beads (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 18 Oct 2004 19:52:03 -0500; I have measured a LOT of ferrites, beads and otherwise, and I agree in general. BUT: Download and study the EXCELLENT pdf catalog from Fair Rite (google to find them), and study the app note on the u; /archives//html/RFI/2004-10/msg00051.html (9,082 bytes)
102. Re: [RFI] Ferrite Beads (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 19 Oct 2004 00:32:03 -0500; There are other options. Look at the Fair Rite catalog (study it carefully -- it takes hours to digest this stuff, and more hours to select the right parts). There are some VERY large clamp-ons of #3; /archives//html/RFI/2004-10/msg00058.html (8,923 bytes)
103. Re: [RFI] Ferrite Beads (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 21 Oct 2004 13:49:00 -0500; Unless 1) our labor is worth only a few pennies per hour or 2) you want to reinvent the wheel, or 3) you want to turn this into a science project, I STRONGLY suggest that you proceed as follows. 1) S; /archives//html/RFI/2004-10/msg00079.html (8,601 bytes)
104. Re: [RFI] Ferrite Beads (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 21 Oct 2004 23:45:04 -0500; Several people, myself included, who have spent MUCH time studying the behaviour of beads have suggested that you do the same, pointed you to the place where you can study them, and given you LOTS of; /archives//html/RFI/2004-10/msg00084.html (9,611 bytes)
105. Re: [RFI] RFI vs QRO? (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 22 Oct 2004 13:13:03 -0500; Two things at play. First, virtually all detection is square law, so once you above a threshold where detection takes place, a 6 dB increase in power will cause a 12 dB increase in the strength of th; /archives//html/RFI/2004-10/msg00093.html (9,315 bytes)
106. Ie: [RFI] Ferrite Beads (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 22 Oct 2004 13:27:40 -0500; I certainly did not belittle you nor anyone else. I did suggest (indirectly) that you were being lazy, expecting others to do your work for you. I did give you a bunch of specific suggestions about h; /archives//html/RFI/2004-10/msg00094.html (10,184 bytes)
107. Re: [RFI] RFI Services bullcrap smell test :) (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 26 Oct 2004 08:29:38 -0500; The comments from Eddie Edwards and others who have noted the significance of the loading on the BPL system highlight the important point also made by W4EF -- if my data is in conflict with solid sci; /archives//html/RFI/2004-10/msg00127.html (9,689 bytes)
108. Re: [RFI] NOISE GADGETS (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 08 Nov 2004 22:36:12 -0600; You have encountered an example of what my friend Bill Whitlock (www.jensentransformers.com) calls "audio jewelry." It is sold to gullible "audiofools" (the mis-spelling is intentional) with a load o; /archives//html/RFI/2004-11/msg00012.html (9,218 bytes)
109. RE: [RFI] NOISE GADGETS (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 09 Nov 2004 14:47:59 -0600; Ah, but you understand the laws of physics rather well! You've correctly identified it as 100% serpent lubricant. Jim _______________________________________________ RFI mailing list RFI@contesting.c; /archives//html/RFI/2004-11/msg00013.html (7,062 bytes)
110. Re: [RFI] NOISE GADGETS (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 09 Nov 2004 16:52:49 -0600; First, audio cables are too short and the wavelengths of audio signals too long for transmission line behavior of audio cables to be a factor. The mfrs of exotic cables would have you believe that is; /archives//html/RFI/2004-11/msg00014.html (10,937 bytes)
111. Re: [RFI] NOISE GADGETS (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Tue, 09 Nov 2004 18:27:16 -0600; West Penn, Gepco, and Belden all make stranded twisted pair cable in the #12 - gauge range. You can also "roll your own" out of stranded THHN from Home Depot by sticking it in a twist drill. And you; /archives//html/RFI/2004-11/msg00015.html (8,770 bytes)
112. RE: [RFI] NOISE GADGETS (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 10 Nov 2004 10:35:31 -0600; Read the parts of my original post about the woofer "flopping around" if there is too much resistance between it and the power amp. It is NOT transmission line behavior at all, but it IS a simple, lu; /archives//html/RFI/2004-11/msg00017.html (8,935 bytes)
113. Re: [RFI] NOISE GADGETS (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 10 Nov 2004 19:19:26 -0600; You might want to take another look at this, Tom. I just did, looking at the circuit analysis of some of the line filters in my junkbox. It never occurred to me to try it, but I think Dave is right -; /archives//html/RFI/2004-11/msg00026.html (9,950 bytes)
114. Re: [RFI] NOISE GADGETS (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 10 Nov 2004 20:50:58 -0600; In a central office or studio, that's absolutely true. But if I'm miles of wire from the central office it isn't. I strongly agree that the filtering is a completely different ballgame if you're tryi; /archives//html/RFI/2004-11/msg00030.html (8,528 bytes)
115. Re: [RFI] DSC Alarm Panel 75 Meters/False Alarms (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 17 Nov 2004 07:16:26 -0600; Common split cores are optimized for 50 MHz and us, and would not be expected to be effective at 4 MHz. Your tone sounds defensive -- it should not be. DSC is the guy with the problem, and THEY shoul; /archives//html/RFI/2004-11/msg00040.html (10,205 bytes)
116. Re: [RFI] DSC Alarm Panel 75 Meters/False Alarms (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 17 Nov 2004 09:25:21 -0600; It depends on how the RF is getting in. If it is a pin 1 problem, it probably would not fix it. If it was differential mode, it probably would. To understand why, I'll review what "the pin 1 problem"; /archives//html/RFI/2004-11/msg00044.html (11,185 bytes)
117. Re: [RFI] DSC Alarm Panel 75 Meters/False Alarms (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 17 Nov 2004 11:07:49 -0600; A bypass cap on the signal conductor to the chassis does not help a pin 1 problem. A bypass cap from the shield to the chassis may help, hurt, or not be enough. It would help by lowering the Z of the; /archives//html/RFI/2004-11/msg00046.html (9,810 bytes)
118. [RFI] Conductive Concrete and Grounding (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 19 Nov 2004 08:43:05 -0600; Gentlemen, I'm doing some reasearch for an applications note I'm preparing on power and grounding for audio and video systems, and wanted to mention the use of a Ufer as a ground electrode. This got; /archives//html/RFI/2004-11/msg00055.html (8,651 bytes)
119. Re: [RFI] Ethernet RFI Elimination? (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 01 Dec 2004 18:37:14 -0600; Hi Eric -- sorry for the late response -- I've been on the road. 14,030, 21,052, and the bottom 20 kHz of 10 meters are some that I have identified. Shielded CAT5 is NOT necessary, and will probably; /archives//html/RFI/2004-12/msg00000.html (7,641 bytes)
120. Re: [RFI] routers & wall warts (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sat, 04 Dec 2004 11:55:00 -0600; Your conclusions are in agreement with mine that this is the dominant mechanism for the best behaved products. Some products may also radiate directly due to a combination of poor circuit layout and; /archives//html/RFI/2004-12/msg00009.html (7,847 bytes)

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