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A comment on FriendlyElec NanoPi R5S as PTP Grandmaster Clock with GNSS/GPS Discipline (2022). Parent comment

Re:FriendlyElec NanoPi R5S as PTP Grandmaster Clock with GNS... by willis936 on Monday October 14, 2024 @07:48AM (#41836629)
The phase of the OCXO's PPS will need to be disciplined to GPS, otherwise your offline time reference will be a stable, low jitter, and wrong.

Edit: I see you mean not feeding in PPS, only 10 MHz where phase doesn't matter. I didn't know Chrony supported that. You could also use a good reference multiplied to replace the Pi's clock.

Gepetto's GPSDO has been tempting to me for a long time. I've just never had an application to justify the cost.

https://www.tindie.com/products/nsayer/gps-disciplined-ocxo/

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Re:FriendlyElec NanoPi R5S as PTP Grandmaster Clock with GNS... by magicalhippo on Monday October 14, 2024 @08:30AM (#41836897)
Sorry, sloppy wording. My circuit will allow for both, with a small uC doing the 10MHz to PPS division and also run a DAC to control the OXCO fine-adjustment.

But I figured I'll try the simple approach first.

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