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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:

2017_06_oscope_picture_rx_audio

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.

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