Phil Kane wrote:
On Sun, 23 Mar 2008 22:53:54 EDT, Klystron wrote:

Wouldn't it make more sense to include WWV and WWVH along with WWVB?
Are you familiar with the Internet-based ntp system? Then, there is the
matter of GPS, which has a time capability that is incidental to its
navigation function.

Want some fun? Compare the time ticks received from WWVB, WWV,
NIST-on-line, and GPS. What, they are not all simultaneous? Welcome
to the real world. GPS time does not correlate with UTC by any means
(several seconds difference).

Each GPS sattelite has it's own on board atomic clock and the system can
easily provide UTC with accuracy on the few microseconds level with an
ultimate limit of +/- 340 nanoseconds using an appropriate receiver and
hardware.

GPS is the basis for most of the current NTP time servers.

http://www.ntp-time-server.com/gps-t...ime-server.htm


--
Jim Pennino

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