Using an Oscilloscope for measuring Rx Audio Level to TNC-PI
Based on June 2017 experiments, we believe the Rx audio level into the TNC-PI should be about 1.4v peak to peak.
On an oscilloscope, that looks like this:
That represents 500mV per division and about 1.4 divisions high.
I know that the scope says 50mV per division but I was using a non-tektronix probe that has a 10:1 attenuator in circuit.