Dave,
You may be able to knock this noise source down with effective line
filtering. The first thing to try is winding many turns of the AC cable
around a #31 ferrite core. It won't help noise that is radiated
directly by wiring inside the unit, but it can take the AC cable out of
the picture. And you should also approach the manufacturer and firmly
insist that they fix it.
73, Jim K9YC
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