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1. [RFI] computer RFI (score: 1): Author: na4m@arrl.net (Phil Duff); Date: Fri, 01 Mar 2002 05:10:57 +0000; I recently built a system with an AMD Athlon T-Bird 1.2ghz cpu on an ASUS A7V266E mboard. I put it in an Antec SX-630 case with their 300W p.s. It sets under the operating table and it's very RFI qui; /archives//html/RFI/2002-03/msg00002.html (7,116 bytes)
2. [RFI] Cable Modem Interference (score: 1): Author: na4m@arrl.net (Phil Duff); Date: Sat, 01 Dec 2001 14:35:11 +0000; The cable modem crud is coming in the antenna system. Last night I determined that the crud from my cable modem is actually coming from it's power-supply. It's a small 12V 1.25a. output deal that is; /archives//html/RFI/2001-12/msg00000.html (9,089 bytes)
3. [RFI] Cable Modem Interference (score: 1): Author: na4m@arrl.net (Phil Duff); Date: Tue, 04 Dec 2001 00:41:14 +0000; The problem cable modem supply was not a "wall wart" type supply as such but was a small supply with separate AC input cord and DC output cables. See portion of my original note below. Its a little l; /archives//html/RFI/2001-12/msg00006.html (9,279 bytes)
4. [RFI] RE: Computer generated RFI (score: 1): Author: na4m@arrl.net (Phil Duff); Date: Wed, 12 Dec 2001 05:15:08 +0000; I'm considering putting together a new system that would reside on the shack radio table. Any strong recommendations pro/con as to the computer case, power-supply, motherboard, etc specifically regar; /archives//html/RFI/2001-12/msg00030.html (7,481 bytes)
5. [RFI] Cable Modem Interference (score: 1): Author: na4m@arrl.net (Phil Duff); Date: Thu, 29 Nov 2001 00:02:03 +0000; Yep - I get crud off my cable modem also - especially noticeable on the low bands. Mine is provided by Cox Communication and is a "Terayon" unit. I feed my 10/100bT PC card directly from the modem -; /archives//html/RFI/2001-11/msg00032.html (8,201 bytes)
6. Re: [RFI] Recommended PC Components for Low EMI/RFI? (score: 1): Author: Phil Duff <na4m@arrl.net>; Date: Sun, 28 Dec 2003 05:50:23 +0000; At 04:10 12/28/2003, Colburn wrote: I am about to assemble a new PC. I would like to select components that have better than average resistance to external RF and minimal output of same. I'd like to; /archives//html/RFI/2003-12/msg00110.html (8,657 bytes)
7. Re: [RFI] Power Line Noise in Indonesia (score: 1): Author: Phil Duff NA4M <na4m@arrl.net>; Date: Mon, 19 Jul 2004 16:26:43 +0000; At 14:52 7/19/2004, Chuck O'Neal wrote: In my years of locating and having the local, very cooperative, power company repair line noises, we have found that the vast majority of radiated line noise i; /archives//html/RFI/2004-07/msg00091.html (9,266 bytes)
8. Re: [RFI] Electric company problem (score: 1): Author: Phil Duff NA4M & Ann Duff <na4m@arrl.net>; Date: Sun, 11 Dec 2005 16:09:07 +0000; QST some years ago published an article describing a home brew version of much the same thing. It used an Aircraft Band AM receiver available at Radio Shack which was installed inside a metal box for; /archives//html/RFI/2005-12/msg00046.html (9,601 bytes)
9. Re: [RFI] SOLUTION - Keyboard Susceptibility (Sort of) (score: 1): Author: Phil Duff & Ann Duff <na4m@arrl.net>; Date: Sun, 12 Aug 2007 02:39:36 +0000; Another solution - a "real" keyboard - the old IBM Model "M" keyboards are still available: http://www.clickykeyboards.com I just replaced the cable on mine this week after purchasing the keyboard as; /archives//html/RFI/2007-08/msg00030.html (8,194 bytes)
10. Re: [RFI] SOLUTION - Keyboard Susceptibility (Sort of) (score: 1): Author: Phil Duff & Ann Duff <na4m@arrl.net>; Date: Sun, 12 Aug 2007 02:58:23 +0000; Sri - typo. I bought the keyboard in the mid 90's not mid 80's. Another solution - a "real" keyboard - the old IBM Model "M" keyboards are still available: http://www.clickykeyboards.com I just repla; /archives//html/RFI/2007-08/msg00031.html (8,480 bytes)
11. Re: [RFI] Wired vs Wireless Routers for RFI (score: 1): Author: Phil Duff & Ann Duff <na4m@arrl.net>; Date: Thu, 10 Jan 2008 01:25:52 +0000; Betcha a lot of these birdies are from switching type wall warts powering the routers. Build a little sniffer from a couple small loops of wire on the end of a short piece of small coax. Plug one end; /archives//html/RFI/2008-01/msg00019.html (9,720 bytes)
12. Re: [RFI] RFI from flat screens? (score: 1): Author: Phil Duff NA4M & Ann Duff <na4m@arrl.net>; Date: Sat, 16 Jan 2010 14:12:24 +0000; We also got a new Sony Bravia LCD - model 52W5100 I think - a week or two before Christmas. Pleased also to report that so far I've not noticed any RFI crud from the new Sony. Even better - so far it; /archives//html/RFI/2010-01/msg00058.html (7,868 bytes)
13. Re: [RFI] FW: Topband: Exciting noise sources (Tim Duffy K3LR) (score: 1): Author: Phil Duff <na4m@arrl.net>; Date: Mon, 28 Mar 2011 16:14:33 +0000; What about ultrasonic receivers/systems such as the one described by W1TRC in April 2006 QST to zero in on arcing on a pole? I've not seen much if any mention of the use of ultrasonic receivers since; /archives//html/RFI/2011-03/msg00109.html (7,897 bytes)
14. Re: [RFI] Computer birdies (score: 1): Author: Phil <na4m@arrl.net>; Date: Tue, 26 Jun 2012 13:53:15 -0500; Would using shielded CAT6 cables reduce the Ethernet RFI? With or without winding around a toroid? 73 Phil NA4M -. .- .- -- Phil Duff Georgetown, TX _______________________________________________ RF; /archives//html/RFI/2012-06/msg00057.html (9,714 bytes)
15. Re: [RFI] Computer birdies (score: 1): Author: Phil <na4m@arrl.net>; Date: Tue, 26 Jun 2012 15:56:27 -0500; As a quick check/test I found some likely Ethernet RFI crud close to 50.120 and 3.770. Shut computer down - 50.120 E'net crud stops as computer shuts off. Disconnected E'net cable from computer & rou; /archives//html/RFI/2012-06/msg00060.html (8,696 bytes)

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