[time-nuts] UBlox as a reference clock source - accuracy ??

[Bob kb8tq]

Hi

On a second to second basis, the 10 MHz will be off by < +/- 0.02 ppm. 
Averaged over 24 hours ( = your frequency counter is set to a > 80,0000 second 
gate time) you will be much closer. +/- 0.0000001 ppm is a good guess. 

The important point is that the first number is more often the one you bump into.
The second one only “counts” if you have some sort of flywheel that does the 
>80,000 second averaging for you.

Bob

> On Jun 19, 2019, at 4:31 PM, David Slipper <softfoot at hotmail.com> wrote:
> 
> 
> Hi, I am running a UBlox Neo-6M and have configured it with LadyHeather 
> to produce a 10MHz output for use as a better reference for a couple of 
> instruments.
> 
> Is there any way with LH to determine the accuracy of the 10MHz output 
> in ppm??
> 
> I am aware that the 10MHz output is jittery on my scope (is that phase 
> noise??) due to the fact that the internal clock is divided by a 
> non-integral value to reach 10 (I believe the internal oscillator is 
> 16MHz).  If I set it to produce 8MHz it is rock solid.
> 
> I am really interested in the long term accuracy of the 10MHz signal - 
> say over 24 hours.
> 
> I'm a bit of a newbie at this so any clarification would be welcome.
> 
> TIA Dave
> 
> 
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.