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1. Re: [RFI] Sylvaniai LED bulb interference 20 meters too (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Mon, 10 Jan 2011 06:33:10 -0600 (CST); I bought 2 LED bulbs at dayton, one had a wide voltage range, like 80-240v, it made all sorts of nasty noise. i am guessing it had a switching regulator in it. the other is a lower power one that has; /archives//html/RFI/2011-01/msg00087.html (7,716 bytes)
2. Re: [RFI] RFI weekend from Hell... (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Tue, 25 Jan 2011 07:39:30 -0600 (CST); Just remember when dissecting that the glass tube contains mercury... and they probably didn't design it to be easily taken apart! Oops, I replied too soon, I see you are already looking into that Ku; /archives//html/RFI/2011-01/msg00201.html (7,711 bytes)
3. Re: [RFI] LED streetlight noise. (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Mon, 02 May 2011 11:23:01 -0500 (CDT); how do you know they are pulsed? and is it intentional or just the result of poor filtering? most likely problem i would suspect are the likely use of cheap switching power supplies driving long wire; /archives//html/RFI/2011-05/msg00006.html (7,351 bytes)
4. Re: [RFI] DFing (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Wed, 04 May 2011 09:48:38 -0500 (CDT); personally i start with a coat hanger soldered on an so239... unless its really, loud then a clip lead wrapped in a little loop is better. Here is a link to a Picasa site showing some pictures of som; /archives//html/RFI/2011-05/msg00030.html (9,092 bytes)
5. Re: [RFI] Possible Satellite Internet Interference (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Wed, 11 May 2011 08:47:48 -0500 (CDT); keep us informed... i have had a noise like that for years, the closest i can get is a house about 1/2 mile away that has satellite internet. i had the previous owner turn off power to the house and; /archives//html/RFI/2011-05/msg00053.html (8,116 bytes)
6. Re: [RFI] RFI free UPS (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Tue, 28 Jun 2011 14:37:36 -0500 (CDT); I have had good luck with both APC and TrippLite. Can anyone point me to some reviews of known RFI-free UPS's? Dan -- N3ND _______________________________________________ RFI mailing list RFI@contest; /archives//html/RFI/2011-06/msg00026.html (6,794 bytes)
7. Re: [RFI] Solar Inverter. (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Tue, 20 Mar 2012 13:38:35 -0500 (CDT); I would make sure you contact the manufacturer... the specs for that say it passed fcc class a and b... which if it did pass means likely one of these: 1. defective equipment (maybe they left out a f; /archives//html/RFI/2012-03/msg00037.html (9,558 bytes)
8. Re: [RFI] Single-point grounding (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Mon, 02 Jul 2012 06:35:02 -0500 (CDT); short = straight bends = not shortest path loops = multiple bends a widely published lightning expert who advises me has told me that he knows of no reason why bends are bad for lightning ground exce; /archives//html/RFI/2012-07/msg00018.html (10,170 bytes)
9. Re: [RFI] Lightning Protection (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Mon, 02 Jul 2012 06:41:19 -0500 (CDT); my advice on things like that is to not waste your time... they can't even put a dent in the fields that are caused by lightning producing storms. If you believe in static dissipation arrays, you can; /archives//html/RFI/2012-07/msg00019.html (7,379 bytes)
10. Re: [RFI] Lightning Protection (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Mon, 02 Jul 2012 13:06:50 -0500 (CDT); the voltage difference between the shield and tower or shield and center conductor can't be any higher than the puncture strength of the insulation anyway. ___________________________________________; /archives//html/RFI/2012-07/msg00031.html (8,231 bytes)
11. Re: [RFI] Lightning Protection (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Mon, 02 Jul 2012 13:12:23 -0500 (CDT); you can't 'discharge' the buildup of charge, there is no where for it to go since the whole area under the downward moving step leader has charge being sucked into it by the field under the leader. t; /archives//html/RFI/2012-07/msg00032.html (9,502 bytes)
12. Re: [RFI] Getting a Gas Furnace, and Electric AC unit... (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Mon, 13 Aug 2012 10:23:48 -0500 (CDT); i have lennox heaters and they don't put out anything i can hear... so in general, no, they don't put out rfi. Hi, Is there a list of Gas furnaces which put out RFI? Do they in general put out RFI? -; /archives//html/RFI/2012-08/msg00062.html (8,246 bytes)
13. Re: [RFI] ISOBAR (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Tue, 18 Sep 2012 09:56:10 -0500 (CDT); the one thing that many people forget is that it is not just the impedance, its the distance. The size of a typical shack, house, and grounding system, is NOT small with respect to the wavelengths in; /archives//html/RFI/2012-09/msg00110.html (8,405 bytes)
14. Re: [RFI] ISOBAR (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Tue, 18 Sep 2012 11:36:23 -0500 (CDT); not necessarily... yes, but its not the resistance that matters in the case of a lightning stroke (or even when talking about 'rf' grounds)... the length has MUCH more of an effect than the resistan; /archives//html/RFI/2012-09/msg00113.html (10,769 bytes)
15. Re: [RFI] AM Radio Interference On 75 meters (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Tue, 18 Sep 2012 11:54:21 -0500 (CDT); 3960khz is not a harmonic of 1530khz so something else is also happening here. listen carefully to the kfbk signal and see if there is some other signal mixing with it. check for other harmonics and; /archives//html/RFI/2012-09/msg00115.html (9,315 bytes)
16. Re: [RFI] ISOBAR (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Tue, 18 Sep 2012 12:12:48 -0500 (CDT); the basic problem of understanding the biggest lightning problems is throwing away the traditional concepts of inductance and resistance, and even impedance. most hams and even electrical engineers u; /archives//html/RFI/2012-09/msg00116.html (9,703 bytes)
17. Re: [RFI] AM Radio Interference On 75 meters (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Tue, 18 Sep 2012 12:49:15 -0500 (CDT); It appears kfbk does switch patterns from day to night, see if you can correlate the start/end of the signal with their switching patterns... it should roughly follow sunrise/set time, but i'm not su; /archives//html/RFI/2012-09/msg00122.html (12,586 bytes)
18. Re: [RFI] ISOBAR (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Wed, 19 Sep 2012 11:22:49 -0500 (CDT); Sep 19, 2012 11:55:43 AM, svetanoff@earthlink.net wrote: " I have 2 aluminum entrance panels: a small one on the south end of the house and a large one on the north end, 54 feet apart. They are both; /archives//html/RFI/2012-09/msg00130.html (9,004 bytes)
19. Re: [RFI] ISOBAR (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Wed, 19 Sep 2012 13:41:23 -0500 (CDT); it may have worked so far, but it still has that hole in it. and it is the 'phase differential' as you like to call it that causes the problem... though it is better called the propagation speed of t; /archives//html/RFI/2012-09/msg00132.html (13,637 bytes)
20. Re: [RFI] RFI Audio Cuts... (score: 1): Author: David Robbins <k1ttt@verizon.net>; Date: Tue, 23 Oct 2012 08:58:10 -0500 (CDT); there was a site that did this, i think it was run by a ve3... a good googling should find it if it is still active. Hi, I would like to collect a large number of RFI audio cuts for my web site. This; /archives//html/RFI/2012-10/msg00033.html (7,808 bytes)

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