[time-nuts] GPSDO "accuracy"

[John Ackermann N8UR]

Hi Donald --

Over a 10 second interval, you're really looking at the short term 
stability of the oscillator in the GPSDO, which could vary be several 
orders of magnitude.  The GPS component will set the nominal frequency, 
but the noise around nominal will be that of the OCXO.

A quite good GPSDO, like a Z3801A or Trimble Thunderbolt, can show short 
term stability in the 12s, but not all will be that good.  An 
inexpensive unit like the Bodnar might be more like 1 PPB.

John
----

On 9/9/20 7:04 PM, donald collie wrote:
> Can any list member please tell me the "accuracy" that can be expected from
> a typical GPSDO
> over, say, a 10 second interval? I have several measuring instruments
> connected to my Trimbal GPSDO, and would like to know what to expect. At
> the moment I am guessing about 1 to 2 parts in 10^12.
> Thankyou,................................................................................Donald
> Brett Collie
> 
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