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Total 11 documents matching your query.

1. [RFI] likely frequency for LED bulbs? (score: 1): Author: Greg Troxel <gdt@lexort.com>; Date: Fri, 09 Jan 2015 14:22:06 -0500; I have 2 LED bulbs (60W incandescent replacement) and have been unable to hear them, which is good. Today I bought 3 more types (at the local Ace, because I can return them if they make noise). So I'; /archives//html/RFI/2015-01/msg00026.html (7,902 bytes)
2. 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)
3. Re: [RFI] likely frequency for LED bulbs? (score: 1): Author: Greg Troxel <gdt@lexort.com>; Date: Fri, 09 Jan 2015 20:14:34 -0500; [build current probe] Thanks; that should get me far more accurate data than what I did. Since sending my earlier note, I made some measurements. I have posted them at: http://www.lexort.com/blog/ama; /archives//html/RFI/2015-01/msg00028.html (7,115 bytes)
4. Re: [RFI] likely frequency for LED bulbs? (score: 1): Author: wa4tuk <wa4tuk-rf@comcast.net>; Date: Sat, 10 Jan 2015 00:37:40 -0500; Greg: Thank you for posting your results. Information about what makes noise and what is (relatively) quiet is hard to find. I will say I am surprised. So far I have avoided LED lamps (A19 style) and; /archives//html/RFI/2015-01/msg00030.html (8,033 bytes)
5. Re: [RFI] likely frequency for LED bulbs? (score: 1): Author: Greg Troxel <gdt@lexort.com>; Date: Sat, 10 Jan 2015 07:52:33 -0500; I was surprised when I got the first one. Please note that I said I have other RFI sources; an attic antenna is not a good situation to start with. I had dealt with a number of them, but the base lev; /archives//html/RFI/2015-01/msg00033.html (8,130 bytes)
6. 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)
7. Re: [RFI] likely frequency for LED bulbs? (score: 1): Author: "George VE3YV" <ve3yv@pathcom.com>; Date: Sat, 10 Jan 2015 14:31:38 -0500; No problems noticed here on HF with either CFLs (many years) or LEDs (more recent), both regular and the dimmables on a dimmer purchased at a big box supplier. Experienced one CFL that became noisy j; /archives//html/RFI/2015-01/msg00035.html (7,796 bytes)
8. 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)
9. 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)
10. Re: [RFI] likely frequency for LED bulbs? (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sun, 11 Jan 2015 05:29:02 -0500; A spectrum analyzer is great for this. Most have the sensitivity of a receiver and any noise peaks (in or out of the ham bands) are almost immediately identified Depending on the scope you can view f; /archives//html/RFI/2015-01/msg00038.html (11,515 bytes)
11. Re: [RFI] likely frequency for LED bulbs? (score: 1): Author: "Roger (K8RI)" <k8ri@rogerhalstead.com>; Date: Sun, 11 Jan 2015 05:35:31 -0500; So far, I've replaced about 7 CFLs with 60 to 100 watt equivalent LEDs. Two 120 watt floods in the garage. I just took them off the shelf at Lowe's and Ace. There are natural light and warm white. No; /archives//html/RFI/2015-01/msg00039.html (10,176 bytes)

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