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References: [ +from:w0ivj@tomthompson.com: 76 ]

Total 76 documents matching your query.

41. Re: [RFI] Broadband RFI... (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Wed, 1 Jun 2016 01:29:54 -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/msg00006.html (8,297 bytes)

42. Re: [RFI] Broadband RFI... (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Wed, 1 Jun 2016 19:42:25 -0600
Scott, I would like it, also. Tom W0IVJ On 6/1/2016 4:59 PM, Dave Cole wrote: On Wed, 2016-06-01 at 18:22 -0400, nm8rmedic wrote: If of interest to anyone, I can provide the model number of a commerc
/archives//html/RFI/2016-06/msg00013.html (8,418 bytes)

43. Re: [RFI] LEDs et al (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Sat, 2 Jul 2016 12:22:53 -0600
Nice post, Dave, I really like your approach and the information you have on your web page. I think trying to correct the problem without getting the authorities involved initially is definitely the
/archives//html/RFI/2016-07/msg00015.html (15,596 bytes)

44. [RFI] TAC Noise Floor Inquiry (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Tue, 5 Jul 2016 16:12:20 -0600
Hi Everyone, I just checked the FCC web site to see the responses to the TAC Noise Floor Inquiry. So far there have only been 10 responses and the filing date closes August 11. I would encourage all
/archives//html/RFI/2016-07/msg00022.html (8,158 bytes)

45. Re: [RFI] TAC Noise Floor Inquiry (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Wed, 6 Jul 2016 09:39:49 -0600
Hi Rob, I think you are correct in what the TAC is looking for, but some of the questions are aimed at a methodology for studying the problem. Only a few questions are aimed at technical studies on t
/archives//html/RFI/2016-07/msg00025.html (8,607 bytes)

46. Re: [RFI] Portable DFing at HF (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Fri, 12 Aug 2016 07:29:31 -0600
Kelly, http://tomthompson.com/radio/ReceivingLoop/loop.html 73, Tom W0IVJ On 8/11/2016 2:57 PM, Kelly Johnson wrote: I am trying to locate a new source of RFI in my neighborhood. I can get a decent d
/archives//html/RFI/2016-08/msg00077.html (7,768 bytes)

47. Re: [RFI] Tom's Loops (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Fri, 12 Aug 2016 09:24:14 -0600
Hi Dave, All the housing are plastic. Tom I noticed that you don't show any sort of housing with your loop tuning caps in them on your page, however one photo shows the top of a plastic housing with
/archives//html/RFI/2016-08/msg00081.html (8,043 bytes)

48. Re: [RFI] Portable DFing at HF (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Fri, 12 Aug 2016 12:09:48 -0600
Kelly and all, My experience has been that local HF RFI is almost always vertically polarized unless you are very very close to it. This means that the null is looking through the loop. My last RFI h
/archives//html/RFI/2016-08/msg00085.html (10,990 bytes)

49. Re: [RFI] Portable DFing at HF (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Fri, 12 Aug 2016 14:16:09 -0600
Kelly, I can easily hear an S-7 noise on my 40m dipole at 700 feet with my AL loop. With the larger CU loop I can hear even further or weaker RFI. Tom W0IVJ On 8/12/2016 1:42 PM, Kelly Johnson wrote:
/archives//html/RFI/2016-08/msg00092.html (13,410 bytes)

50. Re: [RFI] How very interesting... (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Thu, 25 Aug 2016 12:13:10 -0600
I have used the SDRPlay in the same manner with good success. See https://www.youtube.com/watch?v=HIGMmEgzhv0 I built LC band pass filters for the ham bands. That helps alleviate the overload problem
/archives//html/RFI/2016-08/msg00150.html (13,763 bytes)

51. [RFI] Frequency Shifting RFI (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Fri, 26 Aug 2016 12:27:14 -0600
Hi all, This one is going to be difficult to find with a conventional receiver. Guess I am going to have to activate my SDRPlay from the car. https://youtu.be/626BWEsZA9I Tom W0IVJ __________________
/archives//html/RFI/2016-08/msg00160.html (6,545 bytes)

52. Re: [RFI] Frequency Shifting RFI (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Fri, 26 Aug 2016 13:36:03 -0600
I figured it was switcher, but I have never seen one move in frequency so far so fast. Anyway, when I get around to finding it, I'll report back. Tom W0IVJ On 8/26/2016 1:11 PM, David Robbins wrote:
/archives//html/RFI/2016-08/msg00162.html (8,440 bytes)

53. Re: [RFI] Frequency Shifting RFI (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Fri, 26 Aug 2016 19:49:55 -0600
Hi Dave, When I look at the video, it starts with lower resolution and then clears up so I can read the frequency scale. Nevertheless, the scale goes from 3920 kHz to 3995 kHz and the RFI sweeps abou
/archives//html/RFI/2016-08/msg00166.html (8,512 bytes)

54. Re: [RFI] Grow light RFI (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Thu, 1 Dec 2016 11:32:11 -0700
Roger, Here is an independent lab evaluation of a Galaxy ballast the may be a good bet. http://tomthompson.com/radio/GrowLight/RFI_Tests_Galaxy_902220_FCC-Report.pdf Tom W0IVJ 73, Roger _____________
/archives//html/RFI/2016-12/msg00001.html (7,269 bytes)

55. Re: [RFI] Grow light RFI (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Fri, 2 Dec 2016 08:56:31 -0700
Scott, I have not tested the Galaxy ballast, but all the ballasts I have encountered, which include the Lumatek LK1000, the Micromole 1000, and the Quantum Series, will not meet FCC specifications I
/archives//html/RFI/2016-12/msg00004.html (11,974 bytes)

56. Re: [RFI] Grow light RFI (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Fri, 2 Dec 2016 20:53:22 -0700
Scott, Does your ordinance apply just to marijuana grow light ballasts? Tom Actually we are well beyond the formative period for this ordinance. It has been in place for about a year-and-a-half. I di
/archives//html/RFI/2016-12/msg00008.html (14,072 bytes)

57. Re: [RFI] RF (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Fri, 23 Dec 2016 13:57:11 -0700
Jim is right. I have been fighting a motion activated night light for the last 2 days. Since the motion activated device is so small, common mode current is probably not the culprit. I built a differ
/archives//html/RFI/2016-12/msg00073.html (8,747 bytes)

58. [RFI] Spectrum RFI Tracking (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Sat, 4 Feb 2017 13:35:05 -0700
Some time ago, I posted information about using a spectrum display for RFI tracking. One issue that arose was how to use a short vertical antenna (~48 inches) as a broad band antenna. In order to do
/archives//html/RFI/2017-02/msg00001.html (6,880 bytes)

59. Re: [RFI] Opinions Please (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Mon, 1 May 2017 10:36:00 -0600
Karin, Since the management group has already agreed to fix the problem, a gentle reminder that they are in violation of part 18 of FCC regulations might speed them up. 73, Tom W0IVJ On 5/1/2017 10:2
/archives//html/RFI/2017-05/msg00001.html (9,202 bytes)

60. [RFI] Polarity Tests (score: 1)
Author: Tom Thompson <w0ivj@tomthompson.com>
Date: Tue, 13 Jun 2017 11:48:11 -0600
Some of you have mentioned in the past about using a tuned loop for tracking RFI. A question has sometimes arose about the direction of the null of the loop. Larry Benko, W0QE, and I did some polarit
/archives//html/RFI/2017-06/msg00018.html (6,697 bytes)

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