[time-nuts] Reference oscillator accuracy

[Glenn Little WB4UIV]

While I was in the US Navy we had two Cesium standards for the 
navigation center on SSBN submarines.
While in port, we would track LORAN C and compute the drift rate of 
the two cesium standards.
Is there a service, that has drift rates published, that I can 
compare my standards to, so that I can determine the standard drift rate.
I do not remember the drift rates that we determined on the 
submarine, that was a few years ago, but, I seem to remember that the 
rate was in the low nanoseconds.
If a rubidium standard drifts in one direction (does it?) a drift 
rate could be calculated and, after a comparison to a known standard, 
with known drift rate, a very accurate standard could be had for the lab.

What would I expect the drift rate, or jitter, to be in a FRK class 
rubidium oscillator?

Is the drift rate constant enough that a drift rate could be applied 
to a rubidium oscillator to determine it's real frequency at any given time.

We calibrated the submarine Cesium standards every three months.
We had to know the drift rate of our standard as well as the drift 
rate of the standard in each of the LORAN stations to be able to do 
the type of LORAN navigation that we did.

I would like to be able to verify that my PTB-100 rubidium oscillator 
is on frequency.

If I compare two rubidium oscillators, what would I expect the 
relative drift rate to be?

Thanks
73
Glenn
WB4UIV