[time-nuts] GPSDO control system

[Bob Camp]

Hi

…. and GPS has cyclic issues on a 24 / 48 hour basis ….

Bob


On Mar 23, 2014, at 8:58 PM, Tom Van Baak (lab) <tvb at leapsecond.com> wrote:

> Rule of thumb:
> - really good OCXO have frequency drift rates of 1e-10 to 1e-11/day
> - common Rb have frequency drift rates on the order of 1e-11/month
> - Cs do not have frequency drift
> - H-maser drift rates are 1e-15 to 1e-16/day
> 
> /tvb (i5s)
> 
>> On Mar 23, 2014, at 4:32 PM, Charles Steinmetz <csteinmetz at yandex.com> wrote:
>> 
>> Hal wrote:
>> 
>>> Does anybody have data on the drift of Rs or Cs?
>> 
>> Tom has some data posted at leapsecond.com (for H-masers, too).
>> 
>> John Miles has some at ke5fx.com.
>> 
>> John Ackermann has some at febo.com.
>> 
>> I encourage you to roam widely over all three sites -- you will be well rewarded.
>> 
>> Best regards,
>> 
>> Charles
>> 
>> 
>> 
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