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21. Re: [RFI] Grow Light RFI (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Sat, 23 Jan 2016 09:14:50 -0700; Hi Don, Here is an update for the group concerning grow light ballasts. I have posted links to two commercial filters and an EMI test of a Galaxy ballast. The link to my web site is: http://tomthomps; /archives//html/RFI/2016-01/msg00053.html (9,842 bytes)
22. Re: [RFI] Grow Light RFI (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Sat, 23 Jan 2016 12:04:30 -0700; Hi Larry, I have not tried any of the commercial filters, however, Kevin Jones, W7LOZ, reduced his neighbor's ballast RFI by 30 dB using the Revolution filter. The RFI reduction must be dependent on; /archives//html/RFI/2016-01/msg00057.html (11,862 bytes)
23. Re: [RFI] Galaxy Grow Light Ballast Update (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Mon, 1 Feb 2016 10:46:28 -0700; Hi Jim, My experience has been similar to yours. When I was developing my ballast filter, I not only found that the filtering was more effective on the lamp side, but I could gain another 10 dB by no; /archives//html/RFI/2016-02/msg00009.html (10,003 bytes)
24. Re: [RFI] Galaxy Grow Light Ballast Update (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Mon, 1 Feb 2016 14:19:07 -0700; Jim, I respectfully disagree. The choke in the green wire and the common mode choke both are 300uH. A short circuit current between the hot and the green wire would pass through both chokes in series; /archives//html/RFI/2016-02/msg00011.html (12,581 bytes)
25. Re: [RFI] Galaxy Grow Light Ballast Update (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Mon, 1 Feb 2016 16:49:53 -0700; Jim, This choke is on the *Lamp *side of the ballast, not on the *Line *side, so it is unclear what a short circuit among any of the wires on the Lamp side will do. It largely depends on the ballast; /archives//html/RFI/2016-02/msg00015.html (10,238 bytes)
26. Re: [RFI] Galaxy Grow Light Ballast Update (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Tue, 2 Feb 2016 16:55:13 -0700; I did an LTSpice simulation of switching 120 volts through a 600 uH inductor into an 8 ohm load. The inductor delays 30 amps of current through the load by 600 microseconds and 15 amps by 200 microse; /archives//html/RFI/2016-02/msg00021.html (11,353 bytes)
27. Re: [RFI] cops zero in on noisy grow light ballasts (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Wed, 3 Feb 2016 11:00:32 -0700; Ed, When I find a grow operation in my neighborhood that is causing RFI, I point out the fact that they are advertising their grow cycle. Mentioning this generally changes their demeanor, and makes t; /archives//html/RFI/2016-02/msg00023.html (12,153 bytes)
28. Re: [RFI] cops zero in on noisy grow light ballasts (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Wed, 3 Feb 2016 12:04:25 -0700; Gary, You make a good point. So far most the growers I have found have been students and they have not been confrontational. I have been very careful to point out that I do not care what they are gro; /archives//html/RFI/2016-02/msg00028.html (15,602 bytes)
29. Re: [RFI] HF Handy Talkie for RFI Detection? (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Fri, 5 Feb 2016 21:48:36 -0700; Tony, I have been using an SDRPlay ($150 from HRO) and a small laptop or tablet running HDSDR (free). If you build or buy a high impedance preamp, you can use a 3 ft. whip with a magmount and you hav; /archives//html/RFI/2016-02/msg00038.html (8,906 bytes)
30. Re: [RFI] Using the SDRPlay receiver for RFI for searches (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Tue, 9 Feb 2016 11:30:01 -0700; Hi Frank, I have used SDR Console and HDSDR and decided that HDSDR is the best app for me. It takes some time to learn, however. I have recently been tracking down some CenturyLink modem uplink leaka; /archives//html/RFI/2016-02/msg00045.html (12,093 bytes)
31. Re: [RFI] cops zero in on noisy grow light ballasts (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Thu, 11 Feb 2016 20:17:41 -0700; It even gets more complicated in that all the dispensaries in Colorado are having to deal in cash because no banks will associate with them because of federal banking laws. Tom W0IVJ On 2/11/2016 7:5; /archives//html/RFI/2016-02/msg00066.html (11,621 bytes)
32. [RFI] Urban noise (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Thu, 11 Feb 2016 20:23:43 -0700; Yesterday, a friend of mine drove down a main street in the suburbs of Denver using a Perseus radio and a wide band antenna. On the 20 mile trip we experienced 45 dB of change in band noise due to va; /archives//html/RFI/2016-02/msg00067.html (7,271 bytes)
33. Re: [RFI] Urban noise (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Thu, 11 Feb 2016 20:25:47 -0700; I forgot to mention that we were monitoring the entire 40m band. Tom W0IVJ On 2/11/2016 8:23 PM, Tom Thompson wrote: Yesterday, a friend of mine drove down a main street in the suburbs of Denver usin; /archives//html/RFI/2016-02/msg00068.html (7,783 bytes)
34. Re: [RFI] Urban noise (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Fri, 12 Feb 2016 08:56:53 -0700; Hi Dave, We were using a 3 ft. whip with a high impedance preamp into a Perseus receiver. The antenna system was mounted on the car using a mag mount. I use a similar setup with an SDRPlay receiver.; /archives//html/RFI/2016-02/msg00071.html (8,530 bytes)
35. Re: [RFI] Urban noise (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Fri, 12 Feb 2016 11:42:23 -0700; Jim, What surprised me was the magnitude. 45 dB above the band noise is a lot!! Tom W0IVJ On 2/12/2016 10:23 AM, Jim Brown wrote: On Thu,2/11/2016 7:23 PM, Tom Thompson wrote: Yesterday, a friend of; /archives//html/RFI/2016-02/msg00076.html (9,348 bytes)
36. Re: [RFI] Help with tracking power line noise (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Sun, 21 Feb 2016 18:05:02 -0700; If it peaks up on 40m, don't rule out a grow light ballast. Tom W0IVJ Perhaps there is something in the house that is generating the noise, that I will be able to locate when the owner gets back to m; /archives//html/RFI/2016-02/msg00119.html (11,494 bytes)
37. [RFI] CenturyLink VDSL2 RFI (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Tue, 15 Mar 2016 10:43:06 -0600; Hi, Here is a link to a movie I made showing up link modem leakage from CenturyLink RFI. https://youtu.be/HIGMmEgzhv0 73, Tom Thompson W0IVJ _______________________________________________ RFI mailin; /archives//html/RFI/2016-03/msg00034.html (6,856 bytes)
38. Re: [RFI] CenturyLink VDSL2 RFI (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Tue, 15 Mar 2016 15:09:36 -0600; Dale, Which item is no longer available? Tom W0IVJ Dale, K9VUJ Hi, Here is a link to a movie I made showing up link modem leakage from CenturyLink RFI. https://youtu.be/HIGMmEgzhv0 73, Tom Thompson W; /archives//html/RFI/2016-03/msg00042.html (8,780 bytes)
39. Re: [RFI] Tescun PL-660 Antenna (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Tue, 19 Apr 2016 14:26:17 -0600; Hi John, I have found that a 3-element yagi in the VHF or UHF range works best for power line noise. Tracking power line noise at HF is difficult because the long lines act as antennas and it is hard; /archives//html/RFI/2016-04/msg00048.html (8,387 bytes)
40. Re: [RFI] Broadband RFI... (score: 1): Author: Tom Thompson <w0ivj@tomthompson.com>; Date: Wed, 1 Jun 2016 01:01:22 -0600; Hi Kurt, I am using an SDRPlay ($150 from HRO) with a high impedance, broadband preamp connected to a 3 ft. whip. See: https://www.youtube.com/watch?v=HIGMmEgzhv0&feature=youtu.be Tom W0IVJ Anyone us; /archives//html/RFI/2016-06/msg00005.html (8,492 bytes)

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