Topband: 200 Amp low pass filter for power mains?

[JAYB1943 at OPTONLINE.NET]

Try the easy stuff first – I had a similar situation a few months ago and 
got rid of most of it by adding a pair of 0.1 mfd (400 v) capacitors across 
each leg of the 220 vac line inside the junction box.
  GL Jay NY2NY