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Swedish Distributed Time Service
"The NTP servers are custom build hardware (FPGA cards) with 10Gb/s interfaces that can answer signed and unsigned NTP questions over both IPv4 and IPv6 at line-rate speed."
Various time-and-frequency projects, including a Beaglebone Black-based wideband SDR that looks pretty neat.
to electronics hp ntp reverse-engineering rf sdr time ... on 08 June 2015
benc technical blog: radio clock NTP server
Using a (very) cheap MSF receiver module with NTP.
to embedded msf ntp radio raspberry-pi ... on 28 April 2014
Building a Raspberry-Pi Stratum-1 NTP Server
I've got a spare GPS module sitting around somewhere...
to clock gps ntp raspberry-pi time ... on 01 December 2013
Raspberry Pi Stratum 1 NTP server with PPS – accurate timekeeping at low cost
Must give this a try. Unfortunately the only GPS module I've got sitting around is one of the few that actually does RS232 rather than TTL signalling -- so I'd need to play a bit with level conversion.
to gps ntp raspberry-pi time ... on 08 April 2013
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tasty by Adam Sampson.