Hello,
thanks for the information.
But the question is nothing extraordinary and simple:
Suppose you have just tested with the nanovna 2 filters 2 poles 45mhz. They look identical.
If you want a 4 pole filter, how do you plug them in. (They are often serial with the 2 center legs connected to a capacitor to ground)
The question is: You serialize them in the order of the nanovna test or you reverse the direction of the 2nd filter?
or how is the black dot determined if the question is asked differently?
Simple no?
cdt
Gerard