We had radio time receivers (Rugby MSF, now Anthorn MSF) for a long time in the UK. Just plug them into an RS232 hole and have a site-wide master NTP server on

We had radio time receivers (Rugby MSF, now Anthorn MSF) for a long time in the UK. Just plug them into an RS232 hole and have a site-wide master NTP server on that box, fire up the daemon and you're done. I think the last one we paid for was in the region of $250 as the hardware is very simple. http://www.npl.co.uk/science-technology/time-frequency/products-and-services/time/msf-radio-time-signal http://www.npl.co.uk/science-technology/time-frequency/produ... GPS is an interesting prospect but they are pretty HF which is a PITA if you have a unit inside a rack inside a machine room inside a building. MSF is 60KHz so is ground wave propagation so it had great coverage.