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Mike,
Try powering the unit with a 12v battery and see if that removes the problem, if it does then you have isolated the Powersupply as being the cause of the the interference as opposed to the Robofocus itself.
Many power supply supplies are sold with little ferrite cores that go around the power cable to reduce this sort of interference.
Appropriate capacitors to smooth the high frequency ripples might work, but lets work out what is causing it first.
Rally
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