On 8/30/2011 12:05 AM, NPG wrote:
On 8/29/2011 9:59 PM, Chris Albertson wrote:
The other source of time is CDMA. This is a signal sent from cell towers.
This can be better then WWV/WWVB. There are many CDMA based NTP
servers. Some pool servrs are CDMA but I bet you will not find any WWV
based servers
OK, I'm learning how not to do it. and a few ideas on how to do it.
It sounds like the WWV or WWVB signals are not desirable for accurate
timekeeping.
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.
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