Trimble Copernicus feeding a Pi 3 serial NMEA data and 1PPS for a high precision clock. Still getting a ton of jitter on the UART. Need to hook up a scope to see if this is from the module or a Pi / Linux issue. Am able to get 2us precision which is worse than the uputronics module but it may actually be an artifact of using long cables instead of a proper pcb and short traces (line capacitance). Also of note is that the pulse width of 4200ns was too short. I matches it to the 100ms of the upu.

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