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Published on Sep 20, 2013
At one time, it was unusual to display RTTY signals on an oscilloscope to make it easier to get the tuning right. This is a modern version based on an ATmega328, op amp, and LCD display.
BTW, the video rotation is strange - this wasn't how it looked on the phone that recorded it, but I think I may have really confused the phone by moving it around and rotating on a few axes while recording.