[time-nuts] Another "atomic" clock question

Magnus Danielson magnus at rubidium.dyndns.org
Sat Mar 8 00:06:10 EST 2014


On 08/03/14 00:52, Bob Camp wrote:
> Hi
>
> With a “real” 12  to 13 bit ADC and a 200 ns TDC pulse you would ideally get  < 200 / 4096 as your LSB. Nothing like this is ever perfect, so you probably aren’t going to get <50 ps. You probably will be below 100 ps. That’s plenty good enough to make sawtooth correction useful.

When you have sawtooth corrections, the actual time of the PPS is not so 
important, but it will be that reference pulse which gives the high 
time-resolution info about the oscillators phase. The sawtooth 
correction will reduce the GPS modules TCXO into a common view 
oscillator which (almost) cancels out.

If you do not have sawtooth corrections, indirect tracking might be 
possible to consider.

Cheers,
Magnus


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