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Refer to the image below:

Frequency response with Bode Plot and Evaluate filter performance.

Once you have built the circuit, you are to test if it works fine. Two things should be done:

1. Bode Plot.
2. Pass in the noisy signal generated from GNURadio.  

When doing the above analysis, you use a DIFFERENT input signal. 

Bode Plot: Input is the Yellow wavegen from AD2.

Filter output: Input is the Yellow wire from RTL-SDR.

You should only connect ONE of the above-listed yellow wires at a time to your board, or the wrong result will be generated. 

§ Selected content on this page sourced from the following contributors: Nguyen Thanh Dat, Philippe Vachon.