[time-nuts] GSP clock stabilitiy, Rb vs Cs

Bob Camp lists at rtty.us
Sun May 5 08:08:07 EDT 2013


All the data is in an adev plot. In this case short is < 100 seconds, and long is > 10,000 seconds. Those are rough numbers, since a really good Rb (like Corby's) may cross over a bit earlier. A really crummy Cs (low beam current) might not cross over for a couple of days against a well stabilized Rb or Maser. A good BVA OCXO will give the Rb a bit more of a run for it's money ….

The cross overs will happen. Where is going to depend entirely on the specific individual standards you happen to have. If you are making decisions about which of your boxes to use, you have to measure them.


On May 5, 2013, at 12:53 AM, Hal Murray <hmurray at megapathdsl.net> wrote:

> tvb at leapsecond.com said:
>> Rule of thumb: quartz is best short term, Rb or H-maser mid-term, and Cs by
>> far the best long-term. 
> What is short, medium, and long?
> Radio astronomers use H-masers.  Can I assume that they are mid-term and that 
> H-masers are better than Rb (at mid-term)?
> Does the classic ADEV graph contain all the information, or is it making an 
> assumption that is valid in most cases that allows it to compress/hide lots 
> of information that is interesting for only a few obscure types of 
> applications?
> -- 
> These are my opinions.  I hate spam.
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