The speed of dark is your friend. I can't help but think there is a way to take advantage of the delay when a signal goes down a coax to generate the first derivative or rate of change of a signal. Suppose you put your signal into an op amp non-inverting input. And you run that same signal through 3 ft of coax to the inverting input of that op amp. The inputs are 3 nanoseconds apart. The output of the op amp is the instantaneous first derivative. By sampling this at a fixed rate we have the first derivative of the desired signal. Essentially this is what the quadrature sampling does. There must be a way to take advantage of this coax delay to demodulate signals :-)
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