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61. [RFI] Complex Impedance Measurement Instruments (score: 1): Author: "Jim Brown" <jimbrown.enteract@rcn.com>; Date: Thu, 03 Jun 2004 07:24:22 -0500; For some research I am doing into RFI elimination, I need to measure the complex impedance of chokes made using various ferrite cores. I'm specifically looking at reducing common mode current on audi; /archives//html/RFI/2004-06/msg00000.html (6,911 bytes)
62. [RFI] Linksys Routers, EMC, and Ferrite Chokes (score: 1): Author: "Jim Brown" <jimbrown.enteract@rcn.com>; Date: Sun, 06 Jun 2004 12:36:56 -0500; I've been doing some research here in my office/ham shack and have learned some interesting things. I have two Linksys beasts in my office -- one of the BEFR wireless routers that is cited in the cla; /archives//html/RFI/2004-06/msg00004.html (8,356 bytes)
63. RE: [RFI] Linksys Routers, EMC, and Ferrite Chokes (score: 1): Author: "Jim Brown" <jimbrown.enteract@rcn.com>; Date: Sun, 06 Jun 2004 17:22:41 -0500; Don't know. Listen to it and tell us what you hear! In addition to my station receivers, I use a Kenwood TH-F6A (HT that also has a poor HF receiver) to probe around suspected sources and wiring. If; /archives//html/RFI/2004-06/msg00007.html (7,460 bytes)
64. Re: [RFI] TVI (score: 1): Author: "Jim Brown" <jimbrown.enteract@rcn.com>; Date: Tue, 08 Jun 2004 07:10:11 -0500; I suggest that 1) you give the TV a fighting chance by connecting it to a real antenna, connecting the antenna via coax and, if required, a proper balun. 2) If the lights dim in your home with key-do; /archives//html/RFI/2004-06/msg00014.html (9,012 bytes)
65. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Jim Brown" <jimbrown.enteract@rcn.com>; Date: Thu, 17 Jun 2004 17:09:03 -0500; Twisted pair cable picks up far less differential mode RF than untwisted cable, and the higher the twist ratio, the better the rejection. Go straight to CAT5. You may still have problems with common; /archives//html/RFI/2004-06/msg00049.html (7,637 bytes)
66. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Jim Brown" <jimbrown.enteract@rcn.com>; Date: Thu, 17 Jun 2004 22:43:51 -0500; My 6m SSB radio was getting into the landline in my wife's office. A 1" long Fair Rite #43 clamp-on took it right out. You might be surprised to learn that multiple turns around large ferrite cores y; /archives//html/RFI/2004-06/msg00057.html (8,871 bytes)
67. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Jim Brown" <jimbrown.enteract@rcn.com>; Date: Fri, 18 Jun 2004 08:19:49 -0500; Before you make this statement, you should measure chokes built with some of these cores. I have done so, and in a disciplined way. In general, the resistive component of the core's permeability (wha; /archives//html/RFI/2004-06/msg00061.html (13,043 bytes)
68. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Jim Brown" <jimbrown.enteract@rcn.com>; Date: Fri, 18 Jun 2004 08:59:36 -0500; Yes, it does, because Tom's post is aimed at the mindless application of clamp-ons, and mine is aimed at a thoughtful engineering approach. My original post observed that 1) replacing the parallel wi; /archives//html/RFI/2004-06/msg00062.html (9,284 bytes)
69. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 18 Jun 2004 14:03:37 -0500; Reading the latest (July) QST, I see that I'm not alone in recommending this technique. See "Workbench" on pages 54-55, with a photo of about 10 turns of coax wound around a toroidal core. The author; /archives//html/RFI/2004-06/msg00064.html (8,336 bytes)
70. Re: [RFI] CAT 3 Cable? (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 20 Jun 2004 22:42:09 -0500; Tom, I think it's time to play "I'll show you mine and you show me yours." Here are data for a large Fair Rite clamp-on -- 2" OD, 1" ID, 2" long. http://audiosystemsgroup.com/BiggestClampZ.jpg http:/; /archives//html/RFI/2004-06/msg00070.html (9,162 bytes)
71. Re: [RFI] Electrostatic filter rfi (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 28 Jun 2004 14:47:38 -0500; Nothing you have described is likely to have any effect at all at HF. Assuming that the trash is getting onto the power line, you need far more serious filtering than you have described, and filterin; /archives//html/RFI/2004-06/msg00088.html (8,951 bytes)
72. Re: [RFI] Interesting Wireless Broadband article (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Thu, 15 Jul 2004 08:06:39 -0500; My partner owns a former microwave site where we are setting up a ham station (see W6BX on qrz.com). He has just arranged to lease space to a local entreprenour (and radio guy) who is setting it up t; /archives//html/RFI/2004-07/msg00010.html (7,843 bytes)
73. Re: [RFI] RE: Broadband over Power Line (BPL) radio interference (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 16 Jul 2004 09:49:40 -0500; YES! And it is precisely BECAUSE we are the caneries, and that we are VOCAL canaries, that we are so critical to society. I'm not one to quote scripture, but there is a particularly relevant verse th; /archives//html/RFI/2004-07/msg00026.html (8,016 bytes)
74. Re: [RFI] Broadband over Power Line (BPL) radio interference (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 16 Jul 2004 22:15:41 -0500; I strongly agree with this. The issue is a there must be a disproof of their concept. If BPL is implemented, there WILL be BPL users next door to hams The sooner the incompatibility of this adjacency; /archives//html/RFI/2004-07/msg00057.html (12,815 bytes)
75. RE: [RFI] Power Line Noise in Indonesia (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 19 Jul 2004 08:39:24 -0500; a other without have While we're on this general topic -- one of my pro audio engineering friends has pointed out corona discharge as a chronic problem in coastal areas. Can someone address the mecha; /archives//html/RFI/2004-07/msg00077.html (8,640 bytes)
76. RE: [RFI] Canal water! (& BPL) (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 19 Jul 2004 22:54:24 -0500; I strongly agree. Constructive criticism, including, but not limited to, opposing points of view as to how things ought to be handled is NOT bashing, no matter how strongly stated. I am also an ARRL; /archives//html/RFI/2004-07/msg00141.html (10,842 bytes)
77. RE: [RFI] Canal water! (& BPL) (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Mon, 19 Jul 2004 23:02:20 -0500; I thought the one in the most recent QST (July?) titled "Harmful Interference" was damn good. Jim _______________________________________________ RFI mailing list RFI@contesting.com http://lists.cont; /archives//html/RFI/2004-07/msg00144.html (7,913 bytes)
78. Re: [RFI] Question re: Whole House Surge Protection (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Wed, 21 Jul 2004 22:07:50 -0500; Yes. To understand that better, consider this. Virtually all "whole house" surge protectors, and nearly all branch circuit surge protectors, use shunt mode devices (most commonly, MOV's) to short the; /archives//html/RFI/2004-07/msg00166.html (9,285 bytes)
79. RE: [RFI] Amateur transceiver must accept interference? (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Fri, 23 Jul 2004 11:35:39 -0500; It's got a computer interface and digital circuitry that can radiate trash. That part of the radio must conform to Part 15, hence the sticker. Jim Brown K9YC _________________________________________; /archives//html/RFI/2004-07/msg00176.html (7,222 bytes)
80. [RFI] GFI Outlets (score: 1): Author: "Jim Brown" <jim@audiosystemsgroup.com>; Date: Sun, 25 Jul 2004 11:36:10 -0500; Here's a new one (for me, at least). I've always been a medium power guy -- 100 watt barefoot radios have been my standard for 49 years -- but I recently bought a Ten Tec Titan amp (legal limit out); /archives//html/RFI/2004-07/msg00182.html (8,011 bytes)

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