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Old 3rd Apr 2021, 9:38 pm   #3
Julesomega
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Join Date: Dec 2012
Location: Stockport, Greater Manchester, UK.
Posts: 2,085
Default Re: Odd PSU behavior

Could it be 100Hz hum? More likely with a SMPS which usually have a bridge rectifier to generate the 350V which is then switched. The hand effect probably shows you are diverting some of the Transmitter RF which otherwise passes through the bridge on its way to ground/metalwork and gets modulated at 100Hz
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