On 05/12/2015 07:00 PM, Tucek, Joseph wrote:
I'm looking for information on non-GPS time sources.

...
My endgame worst case is to just do PPS from a stratum 2 NTP (or even a 
freerunning oscillator) and lie to my PTP server; hard sync to UTC is a 
secondary concern so long as the cluster agrees with itself.  Endrun is looking 
pretty good, but I'd really like to have a second option to compare against.

Would WWVB meet your requirements for periodic comparisons, or is this place too noisy for that? When you say 'cave' how deep are you talking?

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