[RFI] Dimmer Switch Help

Jim Brown jim at audiosystemsgroup.com
Fri Mar 13 18:36:25 PDT 2009

FWIW, the so-called technical advice on the Lutron website is mostly a bunch of 
technomumbojumbo doubletalk, and your buddy redacted isn't much better. Since 
the dimmer mfrs refuse to make RF-quiet dimmers, my solution is no dimmers. 
Blame everyone but themselves for the noise their dimmers generate. It's not 
the contractor's fault, it's theirs.


Jim Brown K9YC 

On Fri, 13 Mar 2009 20:09:59 -0400, Charlie Gallo wrote:

>> To paraphrase the racing guys, RFI suppression costs money. How low do you
>> want to go?

>> There are a couple of factors involved--one is how the device responds to
>> noise on the line before we dim, the other is how we do the dimming.

>> The best possible solution is made for hospitals and MRI centers--zero RFI.
>> Lotsa bucks. The next best solution is our GP dimming panels--very little
>> RFI, but lotsa bucks. Then comes our LP dimming panels, with the new 
>> FET-based A-series dimming module. Much more modestly priced, but this is
>> still Lutron. (Depending upon how much the electrical contractor marks it
>> up, you're still probably around a hundred dollars per circuit or so.)

>> Want more? Here's the Lutron FAQ for RFI:

>> http://www.lutron.com/default.aspx?pid=6#faq8

>> Note the last suggestion--install an electronic low-voltage lighting 
>> system, with an ELV dimmer. Then comes the big tip: a separate neutral.
>> Lots of times these days electricians will wire a building with a common
>> neutral--combining the white wires and running a lot of circuits back to
>> the panel on a single white wire. This is a bad thing to do--because you
>> get all kinds of nasty noise on the line, and the noise appears on all of
>> the circuits. But it happens (it saves the contractor wire).


>73 de KG2V

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