On 7/21/2020 11:10 AM, Ignacy wrote:
Perhaps the USB cable acts like an antenna.
That often happens. But it can also excite a Pin One in whatever it is
connected to on either end.
For RFI transmitted via USB cable, try USB isolator. E.g.,
https://www.amazon.com/SMAKN-Isolator-Digital-Isolation-Industrial/dp/B00XXPO4UG
If you have more money than you need, perhaps. But all it takes is to
wind multiple turns of the "USB antenna" through a #31 ferrite clamp-on.
They cost a few bucks if you buy from industrial vendors like Arrow and
hit their minimum order of $50 for anything in stock. Fill up that
quantity with more ferrite cores -- most of us need them to kill noise
from the dozens of sources in our own homes!
See http://k9yc.com/KillingReceiveNoise.pdf
73, Jim K9YC
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