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I built a Stratum-1 NTP server at home

My friend Jacques surprised me with a GPS module and I made a good use of it. The components I used are: a Raspberry PI 4 (you can definitely use a v3, and probably a v2 as well), a cheap ass GPS module (less than €5) from Ali, and an optional GPS antenna, stiched to my skylight window, to get a better reception.