Re: USB cable quality and QRM in a spyserver setup with an Airspy Hf+ and Raspberry PI3. 6 microUSB cable test. #airspyhfplus #bestpractice #raspberrypi


that seems very strange to me.
After testing USB cables (with and without ferrite chokes), Filters and reading application notes
for a couple of months my only solution seems to be a good USB Filter
like the Wuerth EPLE + blocking the USB shield to pcb ground with
a 1M Ohm resistor in parallel with a 4n7 Cap. 

To stop and restart the Software had no effect (and if so it would have surprised me)

vy 73`s de

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