开云体育

Adding a ferrite core improved results with USB connection:

Unfortunately ferrite don't helps

On my unshielded black "worse" nanoVNA before adding ferrite,
differences in Smith and logmag noise for 50 Ohm CH0 termination in 100-1200MHz sweeps
with and without USB attachment was easily seen.

I repeater the nanoVNA measurements while running the nanoVNA from a clean 5Volt supply
No differences in measuring the 25ohm resistor or the cables

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Erik, PD0EK