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Build a Stratum 1 PTP Grandmaster on a Budget
11–13 of 13 posts
Re: Build a Stratum 1 PTP Grandmaster on a Budget
#12I saw guides for how to do it with the pi5, but I couldn't get it to lock to the pps reliably and chrony said I had way more jitter on pps and nmea than there should've been. Might try following this one minus the difference in pps
are you trying to use gpio for the pps? feeding the pps into the NIC clock is what gets you the great accuracy, doing it with gpio on the main processor will have much worse jitter
PPS into GPIO will get you sub-millisecond error levels - you've got interrupts, after all!
Sub-millisecond jitter isn't perfect, but it should lock quite happily, you can get a lock on time sources with orders of magnitude more jitter.
Re: Build a Stratum 1 PTP Grandmaster on a Budget
#13I will preface this with I am very supportive of time nerdery. I am thrilled that this person is build and documenting that build. I will now commence shitposting, so please look away now. Booo use a pendulum like a real time lord: https://gentsofleicester.com/project/alanb/ Obviously you really want a tank/vacuum master clock, but they are expensive and big. this GPO Type 46 however is small and more importantly giv…
Or you could head up north and meet the true Grand Master... sorry, T'Grand Master. Oooh, and 'e were grand! 'E were full of wise sayings like "There's nowt wrong wi'owt what mitherin' clutterbucks don't barley grummit!". Of course you'll have to wear t'at of a novice initially...