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1. [RFI] test2 (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Tue, 26 Aug 2014 14:13:14 -0600; _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi; /archives//html/RFI/2014-08/msg00035.html (6,404 bytes)
2. [RFI] test3 (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Tue, 26 Aug 2014 14:20:28 -0600; _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi; /archives//html/RFI/2014-08/msg00036.html (5,973 bytes)
3. [RFI] Another Grow Light (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Sun, 09 Nov 2014 14:08:06 -0700; I noticed my 40m noise floor had increased slightly, and since it was a nice day, I went out with my loop and noise receiver to see if I could find it. I had it located in about five minutes, when th; /archives//html/RFI/2014-11/msg00001.html (7,141 bytes)
4. Re: [RFI] Another Grow Light (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Sun, 09 Nov 2014 22:04:17 -0700; Hi Dave, The filter is my design but I understand that a very similar filter is in the process of being available commercially. I'll keep the group informed as I find out more details. 73, Tom W0IVJ; /archives//html/RFI/2014-11/msg00004.html (7,193 bytes)
5. Re: [RFI] Another Grow Light (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Mon, 10 Nov 2014 22:01:51 -0700; Hi Don, Here is an example of a grow light ballast without and with a filter. The dead time in between is normal band noise. http://tomthompson.com/radio/GrowLight/Grow%20Light%20Ballast%20Filter%20O; /archives//html/RFI/2014-11/msg00007.html (9,336 bytes)
6. Re: [RFI] Nintendo 3DS After Market Power Supply 160 meters RFI (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Tue, 11 Nov 2014 19:55:37 -0700; Hi Don, Nice documentation. I guess it's going to be a never ending battle with these cheap consumer devices mostly from China. Tom W0IVJ 73, Don Kirk (wd8dsb) _______________________________________; /archives//html/RFI/2014-11/msg00011.html (7,752 bytes)
7. [RFI] Noise Measurements (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Wed, 12 Nov 2014 11:25:22 -0700; I just discovered two nice products from the UK that may be of interest. They are a noise measurement receiver: http://www.crosscountrywireless.net/noise_measurement_program.htm and an active HF Ante; /archives//html/RFI/2014-11/msg00013.html (6,979 bytes)
8. Re: [RFI] Noise Measurements (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Thu, 13 Nov 2014 06:42:10 -0700; Dave, That is sad that they won't produce the receiver anymore. On the good side...the active antenna coupled with a Softrock of some variety will make a good combination. Tom W0IVJ I would have love; /archives//html/RFI/2014-11/msg00022.html (7,559 bytes)
9. Re: [RFI] Grow Light Question... (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Thu, 13 Nov 2014 07:48:52 -0700; Hi Dave, All of the electronic ballasts that I have tested have been very bad from an RFI perspective. That includes the Lumatek LK1000, the Quantum 1000 and the Micromole 1000. All of these ballasts; /archives//html/RFI/2014-11/msg00025.html (7,400 bytes)
10. Re: [RFI] Grow Light Question... (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Thu, 13 Nov 2014 09:42:19 -0700; Right...the magnetic ballasts run hotter than the digital ballasts because they are not as efficient. The magnetic ballasts are also quieter, but that is acoustically, NOT from an RFI perspective. To; /archives//html/RFI/2014-11/msg00028.html (7,844 bytes)
11. Re: [RFI] likely frequency for LED bulbs? (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Fri, 09 Jan 2015 17:48:54 -0700; Hi Greg, I suggest you build a fixture with a bulb socket on one end and an AC plug on the other end so you can light the bulb. Before you put the AC plug on the cord, wrap a toroid (eg FT117-43) ful; /archives//html/RFI/2015-01/msg00027.html (9,046 bytes)
12. Re: [RFI] likely frequency for LED bulbs? (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Sat, 10 Jan 2015 10:43:26 -0700; I just made some light bulb measurements using an RF current probe, an oscilloscope, and a spectrum analyzer. My current probe is flat within 3 dB from 500 kHz to over 50 MHz. The common mode current; /archives//html/RFI/2015-01/msg00034.html (10,005 bytes)
13. Re: [RFI] likely frequency for LED bulbs? (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Sat, 10 Jan 2015 14:24:32 -0700; I forgot to add that the measurements that I made where I saw energy were differential. Tom W0IVJ On 1/10/2015 10:43 AM, Tom Thompson wrote: I just made some light bulb measurements using an RF curre; /archives//html/RFI/2015-01/msg00036.html (11,090 bytes)
14. Re: [RFI] likely frequency for LED bulbs? (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Sat, 10 Jan 2015 15:46:42 -0700; Also, my current probe sensitivity is 30 dB less that the actual power. That is to say if I put 0dBm into a 50 ohm resistor and sample one lead of the circuit, my current probe will show - 30 dBm. So; /archives//html/RFI/2015-01/msg00037.html (12,087 bytes)
15. [RFI] RFI Success (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Sat, 17 Jan 2015 10:47:52 -0700; In the fall discovered that my noise level on 20 meters had increased by about 18 dB above my normal band noise. I suspected a grow light situation so I took a loop reading and headed east where ther; /archives//html/RFI/2015-01/msg00148.html (8,173 bytes)
16. [RFI] RFI Success (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Mon, 19 Jan 2015 12:23:09 -0700; Hi Ed, They had several more lights of the same type that were not producing RFI, so I think it was just a case of a ballast going bad. Tom Do you have the model number of the offending device? I'd l; /archives//html/RFI/2015-01/msg00161.html (10,111 bytes)
17. Re: [RFI] RFI Success (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Mon, 19 Jan 2015 12:39:41 -0700; Both of these lights showed a little difficulty starting, but once lit, they looked normal. It really is insidious isn't it? Tom w0IVJ I've seen exactly that, Tom. It was a CFL that I had in a table; /archives//html/RFI/2015-01/msg00163.html (7,855 bytes)
18. Re: [RFI] ARRL Board of Directors resolution related to FCC enforcement of radio-interference issues (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Wed, 29 Jul 2015 14:43:08 -0600; Ed, Please thank the board. This has been a long time problem. Good luck to all of you with this plan. Tom W0IVJ 39. On motion of Mr. Frenaye, seconded by Mr. Isely, the following resolution was ADOP; /archives//html/RFI/2015-07/msg00112.html (9,957 bytes)
19. Re: [RFI] 160m & 80m RFI issues requesting ideas for ANC4 sense antenna to cancell out local noise (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Sun, 1 Nov 2015 13:30:46 -0700; Hi All, The SDRPlay radio ($150 from HRO) coupled with HDSDR ( free) makes an excellent tool for tracking RFI. I recently was called in to track the source of some 80m interference. This RFI was abou; /archives//html/RFI/2015-11/msg00012.html (11,280 bytes)
20. Re: [RFI] Switch-Mode Noise Source Identified (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Fri, 6 Nov 2015 22:47:48 -0700; Great job, Paul. Thanks for sharing. 73, Tom W0IVJ Yesterday, I went on foot with my RFI locate gear and located the source in under an hour, about a 1/4 mile away. You can read about it at the top o; /archives//html/RFI/2015-11/msg00015.html (7,587 bytes)

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