[Elecraft] Filtering RFI from LED & flouresence Dimmer Switches

[Bob]

In a past job, I designed low and medium power phase cut dimmers.  Ferrite
clamps/beads will be almost useless.  Well designed filters will have
rather large series inductors (1 to 10 mH) and high voltage caps designed
to filter the high harmonic content caused by the Triac switching.  Cheap
ones barely pass the FCC conducted noise requirements.  More expensive ones
tend to have more robust filtering.

LED Dimmers are a horse of a different color.

I agree it would be easier to purchase a decent (not cheap) dimmer than try
to retrofit one.  Drop some serious bucks on a Lutron model and try it.
Take it back if it doesn't work.

73, Bob, WB4SON

On Mon, Jan 25, 2016 at 9:38 AM, David Cole <dave at nk7z.net> wrote:

> Hi,
> I have a series of three articles on RFI, located at:
>
>
> http://nk7z.net/category/info/mitigation-of-rf-interference/i-have-rfi-series/
>
> the second article down, titled "I have RFI, now what: House Cleaning"
> has the some of the correct part numbers for the Fair-Rite corporation
> snap on ferrites.
>
> Best is to replace the dimmers though...
>
> --
> Thanks and 73's,
> For equipment, and software setups and reviews see:
> www.nk7z.net
>
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>
>
> On Sun, 2016-01-24 at 21:56 -0500, johnpierce wrote:
> > I have several dimmers around my house that generate 20db of noise on
> the HF
> > bands.  I have seen some recommendations for ferrite beads that can be
> used
> > for filtering.  However, I cannot find that info.  Some were snap on
> beads.
> > I am assuming that locating them in the power feed lines to the dimmer
> box
> > would help in reducing the RFI.  What do you recommend?
> >
> >
> >
> > John
> >
> > AD2F
> >
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