[ntp:questions] Questions about joining pool.ntp.org
albertson.chris at gmail.com
Tue Aug 30 23:05:18 UTC 2011
> If you care about microseconds or nanoseconds, shortwave radio is a poor
> choice. The length of the radio propagation path changes constantly! Not by
> much but if you care about the nanoseconds. . . .
> If you REALLY NEED the nanoseconds, buy an atomic clock and have it
> calibrated by your national standards people. If you don't REALLY NEED
> the nanoseconds you can almost certainly save $50K - $100K.
GPS, eBay and the cell phone industry have changed that. Prices have
fallen to well below $1K or even below $100 if you can do some soldering.
For example Synergy's "12MT+" receiver has a 2 nanosecond (1 sigma) error
and sells for $60 new. It is easy to find a good working Rubidium
oscillator (a kind of "atomic clock") on eBay for $100 to $150.
Redondo Beach, California
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