[AMRadio] Strange, did aliens arrive?

ww2bom at sbcglobal.net ww2bom at sbcglobal.net
Fri Feb 24 21:54:25 EST 2017

GPS uses as I recall, Cesium standards that can reach stabilities of ≤1.0E-14 after 30 days. Ground stations monitor and track the GPS timing, and can adjust it. In general terms, Cell phone tower sites typically use Rubidium standards that are GPS disciplined and can reach stabilities of <2.5E-12 for site synchronization and timing, which is what your cell phone clock is locked to. I think WWV uses Cesium standards, but I can't say for sure on that with all certainty. 

    On Friday, February 24, 2017 11:38 AM, Donald Chester <k4kyv at charter.net> wrote:

 > Speaking of Cell phone time, that is GPS locked. What does GPS use for a
> standard? If the GPS system is WWV locked, that might explain why I ended
> up in Seattle instead of Ft. 
> Bill,

The GPS carrier signals originate from on-board atomic clocks monitored by ground control stations.
Should be a lot more precise than WWV.


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