[Elecraft] PX3 signal artifact - still seeking a solution

[Jim Brown]

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