Dave Tweed wrote:
> My guess would be that the air conditioner controls the compressor with a
> triac, and this is producing some high-frequency harmonics on the power
> line. The compressor motor itself should be an induction motor, and not
> producing harmonic distortion. A brute force low-pass filter on the AC
> line, or maybe a ferroresonant transformer, would help confirm this.

You mean, like a 0.1uF cap across the 110V lines? Maybe with a choke in 
series with the load?

How about an off-the-shelf line conditioner, or an online UPS?

Vitaliy 

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