On Friday, January 21, 2011 10:38:07 AM UTC-5, pacman101 wrote:
...
> I am still trying to quantify the problem. FYI I am not trying to cancel
> Acoustic Noise, but RF noise. The noise being generated is right on top of
> my frequency band. The switch is part of a system that for some reason
> generates RF noise (EMI) when it is on but not when it is off.
I hope it goes without saying that the best way to deal with the noise is suppressing it at the source. That may be as simple as a bypass capacitor or a common-mode suppressor (you see those on some computer signal cables). If that fails, then get fancy.
Jerry