I doesn't sound like the SDR to me it sounds like a ground loop or common mode at the computer. I would first make sure everything is plugged in at the same place, not going through multiple strips each with its own "protection" Ground everything to the same point. Isolate things that carry RF like feedlines that includes the line between the amp and the rig as well as between the amp and antenna. This is the basic minimum then I would start adding ferrite and stuff like that.
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