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Building a Raspberry-Pi Stratum-1 NTP Server
Adding PPS to a cheap USB GPS stick | Brendan's Radio Blog
An NTP Stratum-1 clock usng a GPS 18 LVC and FreeBSD
Time Server
PPS over USB
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How to use GPS module for real-time location and PPS clock synchronization service
Datasheet of multiple GNSS mouse, LS2307x-G series
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