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What you posted is fine for looking at a signal from your rigs receive audio out or your transmitted audio if you have a monitor function.  Like the incoming signal, PSK 31 or whatever you are hearing in the rigs speaker.  What he is looking for is a unit to sweep the incoming signal input similar to the spectrum display on an Icom 756 ProII or III.  You can get free software to look at the former but the latter can be pretty expensive. You also need a converter board that connects to the radios receive circuitry to convert the incoming data  so it can be displayed on the scope.