[RFI] Dimmer Switch Help

kd4e doc at kd4e.com
Tue Mar 17 08:17:09 PDT 2009

One variable is the size and quality of the contact surface with the 
poor quality and/or small surface area increases the probability of noise.

Also, a poorly sealed unit or one that uses moisture-sensitive materials
will degrade under certain environmental conditions.

I would prefer a good quality step switch to a slider for noise mitigation
in a variable light-level control.

> My own tests indicate that the Lutron dimmers produce far less RFI than 
> those made by Leviton.  I recently installed a Leviton dimmer that was 
> boldly branded as having an RFI filter.  But on 160m-80m, its filtering was 
> much less effective than the comparable Lutron model.  I have since replaced 
> all Leviton dimmers in our household.
> For years, my shack's 120VAC equipment was simply plugged into the nearest 
> shack wall outlets.  These outlets share the same circuit with a couple 
> other rooms on a common breaker.  Running 100W from an HF rig resulted in a 
> slight dimming of the room's incandescent lights.
> About a year ago, I decided to run two dedicated 20A circuits into the shack 
> fed from a tandem breaker -- each breaker feeding one 20A duplex outlet in 
> the shack.  Each outlet subsequently feeds an isolation transformer, which 
> is then routed to a two-circuit, 16-outlet Ethernet-controlled power strip. 
> Gone is the room light dimming and almost miraculously, other RFI/EMI has 
> also disappeared.
> FYI - I put a bit of money into the outlets.  They are Leviton 
> hospital-grade, isolated ground, with built-in surge protection (Catalog 
> 8380-IGW).  At first glance they seem absurdly expensive, but comparing the 
> cost to a high-quality surge-protected power strip, the cost was comparable.
> Paul, W9AC

Thanks! & 73, doc, KD4E
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