From the ARRL at URL:
http://www.arrl.org/tis/info/touchlamp.html

Light-dimmer Interference Reduction

Radio Amateurs who've have been cursed with RFI from solid-state light
dimmers will be interested to know that at least one domestic
manufacturer -Lutron - produces light dimmers that incorporate RFI
suppression techniques. The Lutron NOVA series uses toroidal chokes that
provide a significant level of RFI suppression.

I bought a Lutron model N-600, which will handle up to 600 watts of
incandescent lighting. Temporarily installed in my radio shack, a generic
light dimmer produced an S9+ reading at 230 kHz (an arbitrary noisy
frequency). The N-600 produced a reading of S3, a difference of about 40 dB.
Admittedly, this is not zero, but installing the N-600 some distance away
provided a reduction in RFI that is very gratifying. Indeed, I new hear new
noise sources, heretofore undetectable through the dimmer din.

You're not likely to find these dimmers at your local discount store, and
they are not inexpensive. Check for the availability of these dimmers at a
lighting fixture store and expect to pay about $25 apiece for them.

-- Richard G. Brunner, AA1P, 10 Brookside Dr., Foxboro, MA 02035

Lutron Electronics Co., Inc.
Suter Rd.
Box 205
Coopersburg, PA 18036
215-282-3800

If you come up with a better solution for these problems, please write to
the RFI Desk with the solution. It sounds like it would be a good candidate
for Hints and Kinks!

"73" from ARRL HQ


--
The Anon Keyboard
I doubt, therefore I might be



"Hank" wrote in message
...
Hello,

I am having my house re-wired and and I am considering putting in
dimmer switches for lights and /or ceiling fans.

I have heard than can cause radio noise.

Any tips about their installation ?
Are some switches better than others ?
If the power is off to a switch, they can not cause noise, can they ?


Ideas ?

Thanks,

me,...........