Tried a passive 50 MHz, the usual 3R3, 1nF. I think the 3R3 is ±5% and the 1nF is class 2 ±10% and i remember something about giving them a day after soldering.
Anyways. Did all the voodoo and cargo cult stuff. Still shit. Noise is crazy even when nothing is going through the shunt and you get only crap when something does.
Shit.
It's not like an OP would magically fix that.
>Whats the impedance of a random misshapen solder blob.