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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:


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.

Some modern nodes use a Chinese 200khz digital scope to have continuous availability for monitoring a selected receiver. See TNC-PI -> Audio Monitor for one way to hook up a permanent scope to the node.

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