One variable is the size and quality of the contact surface with the
slider,
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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