[time-nuts] Home made GPS disciplined atomic clock

Bruce Griffiths bruce.griffiths at xtra.co.nz
Sun Jan 25 21:15:51 UTC 2009


EWKehren at aol.com wrote:
> Sorry, I offended you Bruce. True time and frequency are definitely inter  
> related, but as you and Esa pointed out the Trimble has an output that does  
> change under certain circumstances. And the reason Esa is pursuing his approach  
> is that for his need as a frequency standard the unit is not doing the job.  
> Bert
>   
Bert

Since the Thunderbolt produces the PPS output by dividing down the
10MHz, except during jam sync the 2 signals should have similar noise.
Since its more complex to lock to a PPS signal than lock to a 10MHz
signal, its perhaps simpler to lock to the 10MHz output with a suitably
large loop time constant.
Low noise analog phase detectors can then be used.


Bruce




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