Orange Pi Zero NTP Stratum 1 PPS GPS Server with Armbian OS. Link to the Tutorial - http://schwartzel.eu3.org/ntp-stratum1.html
This tutorial uses a 3.3V capable GPS module with PPS output - TOPGNSS GN-701 (u-blox 7) but other similar modules should work.
This tutorial is for the Orange Pi Zero, but will probably work for other boards.
I couldn't easily do a comprehensive hardware and software tutorial on this forum, so I've published it on my web server and linked from here and attached a PDF. Link to the Tutorial - http://schwartzel.eu3.org/ntp-stratum1.html
Tutorial PDF ntp-stratum1.pdf
If you spot any typo's or errors please let me know.
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