Kris,
There are no guarantees with line filters. If you can borrow one from
someone, you try it and if it works you install it permanently avoiding
long leads that might cause filter blowby.
Is there a ham club near you? How about at the college there? They
might have a filter in the junk boxes.
If you have an AC isolation transformer, or a tapped USA to Europe
transformer, that you can run as 120 in and out AC volts, you could try
that to see if it helps. A good isolation transformer reduces noise
about 20 dB depending on the frequency. The problem may be Variable
Speed Drives in the appliance, lots of modulated semiconductors
controlling the motor for "Green" efficiency. Oh, the laws of
unintended consequences from the environmentalists!
-Stuart Rohre
K5KVH
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