I purchased the Plugable® 7-Port USB 3.0 SuperSpeed Hub with 20W Power Adapter. Recently, I have noticed a marked increase in RFI noise from the power supply. A swirling electrical noise coming out the speakers of my radio. It makes listening to the radio impossible unless I unplug the USB Hub power supply. Then, all noise disappears. I have the supply plugged into a high quality Trip-Lite Isobar noise suppressing power strip. I have tried to wrap the power cord thru some ferrite cores. But nothing works. Is there a quieter 5VDC supply available? I have a hard time believing this would pass the FCC test.
Any help you can offer would be appreciated. I can record the noise if you want.