Re: Computer RFI problems-FARMERIK
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huelbe_garcia@fastimap.com <huelbe_garcia@...>
Hi Farmerik,
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one of the most common sources of RFI (as noticed by colleagues here in Brazil) are the Compact Fluorescent Lights (CFL). Some brands generate lots of noise, other not that much. If you open one of these (be careful) its base contains a high frequency, harmony rich oscillator. Although the placeholders are marked in the circuit board, cheap brands hardly install the inductors/capacitor meant to mitigate the RFI. PY2WM DeMarco wrote an article specifically on CFL-generated noise and how to solve it. The translated article (by Google Translator) is available here: http://tinyurl.com/4hfjqzt the original article is here http://py2wm.qsl.br/RFI/More_on_RFI_lamps/Filter.html --hg ----- Original message -----
From: "farmerik" <farmerik@...> To: ultralightdx@... Date: Wed, 12 Jan 2011 19:34:38 -0000 Subject: [ultralightdx] Re: Computer RFI problems-FARMERIK It looks like the smaller mixture numbers are better for lower frequencies, so I had that wrong in my first post. My focus is the AC house wiring, all circuits seem to be loaded with RFI. If I put a portable radio next to a filament bulb, I get tons of RFI when I switch it on, and the higher the bulb wattage, the more noise. I started down this road when I had way too much noise in my Hammerlund HQ-100, even on the standby position, with no antenna connected. Not much sense working on antennas, if the house is so full of RFI. I did read that excellent article [tried to understand what I could] and went to the Fair-rite catalog. I don't see split chokes for LW and AM though. I see Delta make power filters for RFI, which may be what I need most. Thanks for the help, there is a lot to learn about this. -FARMERIK --- In ultralightdx@..., "Mike Mayer" <mwmayer@...> wrote:
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