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21. [RFI] just what everyone needs! (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Mon, 10 Sep 2012 13:47:38 -0700; I am not in total agreement with you Dale, but I see your point. If an absorber were in the path of a critical purposeful reflection a change in pattern could occur. I look at this seeing a wire that; /archives//html/RFI/2012-09/msg00040.html (9,085 bytes)
22. [RFI] Noise changes when room lights turn on / off (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Thu, 13 Sep 2012 20:16:08 -0700; Most likely the reason the noise changes when you switch your light on is there is a small line voltage drop. This would cause a free running oscillator such as used in switching power supplies to sh; /archives//html/RFI/2012-09/msg00070.html (9,024 bytes)
23. [RFI] RFI with sound bites (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Sun, 2 Dec 2012 11:05:50 -0800; Gary, I took a look at your satellite view. There sure seems to be potential for noise in what I see. Are those electric train tracks near your house? I can just imagine the noise from an arcing powe; /archives//html/RFI/2012-12/msg00003.html (7,608 bytes)
24. [RFI] RFI with sound bites (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Sun, 2 Dec 2012 22:31:29 -0800; Gary, Generally the closer to the arcing source the higher in Frequency you will be able to hear it. From your descriptions I believe your noise source may well be over a mile away. The lower frequen; /archives//html/RFI/2012-12/msg00007.html (7,466 bytes)
25. [RFI] Oh, happy daze!! (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Wed, 5 Dec 2012 18:39:41 -0800; Hi Charlie, In a previous life I sold fence chargers and other farm supplies for a living. A couple things I remember. You are very right in that a good ground is needed. Some of the application note; /archives//html/RFI/2012-12/msg00017.html (8,144 bytes)
26. [RFI] Ultrasonic Dish (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Wed, 2 Jan 2013 09:32:35 -0800; plastic or metal: Cook ware, kids snow saucers, etc. Just go into Lowe's, Home Depot, Sears, Koh'ls, or hard ware stores and look around. I have to take issue with this statement as I spent several; /archives//html/RFI/2013-01/msg00012.html (8,267 bytes)
27. [RFI] Ultrasonic Dish (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Wed, 2 Jan 2013 09:54:05 -0800; the Midnight Science RX2 and was not happy. The new RX3 is much more sensitive. I have no idea how it compares with the expensive commercial units. I bought all the parts to build the W1TRC receiver; /archives//html/RFI/2013-01/msg00013.html (8,623 bytes)
28. [RFI] Ultrasonic Dish (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Wed, 2 Jan 2013 14:07:57 -0800; In my experience, once you get into an area where the interference is, the best tool is to use an A.M. receiver on a frequency between 300 and 800 MHz. The receiver should have a decent signal stren; /archives//html/RFI/2013-01/msg00021.html (8,272 bytes)
29. [RFI] RFI on 1.8 mhz (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Tue, 22 Jan 2013 08:34:02 -0800; I am able to identify street lights gone amuck 100% of the time just from the sound of the audio here. Lee K7TJR _______________________________________________ RFI mailing list RFI@contesting.com h; /archives//html/RFI/2013-01/msg00115.html (8,054 bytes)
30. [RFI] RFI on 1.8 mhz (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Tue, 22 Jan 2013 10:11:47 -0800; Street lights for some reason have a very throaty low pitch to their sound. Although the frequency is fixed by the line voltage, the harmonic content makes the lights at least here have a very disti; /archives//html/RFI/2013-01/msg00119.html (8,643 bytes)
31. Re: [RFI] Strong, broadband noise during wet conditions (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Fri, 15 Mar 2013 20:44:09 -0700; Matt, If you live within a mile or two of any 100 to 500 KV power lines you may be getting corona noise. At my previous QTH I could count on the high pitched buzz any time it rained or snowed or even; /archives//html/RFI/2013-03/msg00081.html (7,622 bytes)
32. [RFI] LED Bulbs (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Wed, 12 Feb 2014 10:54:35 -0800; For me this discussion is of a minor problem. I have had a wood products company move within 200 yards of my antenna field. Not only have they caused a rather loud audio noise but they have installed; /archives//html/RFI/2014-02/msg00069.html (10,366 bytes)
33. Re: [RFI] More on "my" noise. (score: 1): Author: "Lee K7TJR" <k7tjr@msn.com>; Date: Mon, 28 Apr 2014 15:07:37 -0700; Ken, You might look around your neighborhood for a new installation of a water pump, sewer pump or any facility using a large electric motor. These modern VFD motor drives are killer on wideband nois; /archives//html/RFI/2014-04/msg00237.html (10,755 bytes)
34. [RFI] RFI via Florescent Lights (score: 1): Author: Lee STRAHAN <k7tjr@msn.com>; Date: Thu, 7 Apr 2016 21:16:12 +0000; A lady friend of mine owns the local bowling alley. She decided to replace the fluorescent lights over the alleys with direct wire 4 foot LEDs. When 2/3 done and waiting for more bulbs she reported h; /archives//html/RFI/2016-04/msg00012.html (8,856 bytes)
35. [RFI] Florescent TUBE style, LED replacements (score: 1): Author: Lee STRAHAN <k7tjr@msn.com>; Date: Tue, 7 Jun 2016 20:59:50 +0000; Here is another place to get LED replacements They have treated me well https://www.earthled.com/ Lee K7TJR _______________________________________________ RFI mailing list RFI@contesting.com http://; /archives//html/RFI/2016-06/msg00042.html (8,151 bytes)
36. [RFI] Noise - where do I start? (score: 1): Author: Lee STRAHAN <k7tjr@msn.com>; Date: Sun, 25 Sep 2016 17:55:10 +0000; Tom and RFI guys, One other trick that may be available to you with your spectrum analyzer is to sync the sweep with the line frequency. Most analyzers have this capability. Its just marked "Line" in; /archives//html/RFI/2016-09/msg00058.html (8,369 bytes)
37. Re: [RFI] Strange noise on 80m (score: 1): Author: Lee STRAHAN <k7tjr@msn.com>; Date: Wed, 14 Dec 2016 01:27:16 +0000; Martin, This looks almost exactly like the noise I get from the wood products manufacturer next door. They use VFD drives on several motors there. One is 100 horsepower. I get the interference also i; /archives//html/RFI/2016-12/msg00051.html (8,438 bytes)
38. Re: [RFI] Antenna Polarization Tests (score: 1): Author: Lee STRAHAN <k7tjr@msn.com>; Date: Tue, 13 Jun 2017 19:42:22 +0000; So Tom, Am I reading your data correctly, I see only a 9.7 dB difference as the loop is rotated from broadside to inline with the vertical source in the first two columns of A and B. Or am I missing; /archives//html/RFI/2017-06/msg00023.html (8,498 bytes)
39. Re: [RFI] Connectors for 1/2" tinned copper braid strap? (score: 1): Author: Lee STRAHAN <k7tjr@msn.com>; Date: Mon, 26 Feb 2018 17:53:33 +0000; You will find larger terminals at almost all auto parts stores. Lee K7TJR OR I've got some 1/2" tinned copper braid strap on hand that I'd like to use for bonding between my station equipment. I'm wo; /archives//html/RFI/2018-02/msg00092.html (8,451 bytes)
40. Re: [RFI] Connectors for 1/2" tinned copper braid strap? (score: 1): Author: Lee STRAHAN <k7tjr@msn.com>; Date: Tue, 27 Feb 2018 05:08:56 +0000; Kurt, you are way off base talking about auto parts stores the way you have. You have obviously made an assumption. Trust me, I owned an auto parts store for over 20 years and we, meaning my store an; /archives//html/RFI/2018-02/msg00095.html (9,800 bytes)

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