After a lot of fussing with questionable USB cables and less than 4.8 volts at the far end of the cable I bought one of the little 3 amp Adjustable buck converters off ebay, adjusted the output to 5.3 volts and wired it directly to the USB 3.0 hub circuit board. ?No more loose or questionable connections or low voltage creating strange problems. ?I was particularly interested in RFI interference and was prepared to put add an external filter on the output but measuring the output noise with a scope showed about 2 millivolts of high frequency noise, non that interfered with the raspberry pi however I will put a copper shield around the buck converter and include an RFI filter for peace of mind. ? ? ? ?
Bill P.