[time-nuts] How Rubidiums make their frequency

Hal Murray hmurray at suespammers.org
Thu Apr 20 02:03:52 EDT 2006

[Clocks in GPS satellites]

> I said "drift-free Rubidium" :-)
> They last longer.

I've seen comments about Rubidium having better short term stability than 

What's "short" in that context?

How often do the ground stations talk to the satellites?

Is it reasonable to correct for the drift?  If the drift is slow enough the 
communication channel is already in place.  It shouldn't be too much work for 
the ground stations to track the frequency as well as position.

There is probably a good writeup on this someplace.  Anybody seen one?

The suespammers.org mail server is located in California.  So are all my
other mailboxes.  Please do not send unsolicited bulk e-mail or unsolicited
commercial e-mail to my suespammers.org address or any of my other addresses.
These are my opinions, not necessarily my employer's.  I hate spam.

More information about the time-nuts mailing list