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Try adding ferrite cores to all the wire leads, including the AC power cord if your unit has one.  1000uf electrolytic capacitors across the DC terminals may also help.  Some of the worst units, especially those imported from China with plastic cases and no FCC certification, need to be isolated inside a manufactured or home brew “Faraday shield” cage.  The cage also needs to have its own separate earth ground.   An old microwave oven will make an ideal cage.