I totally messed up what I wanted to say. Here's the corrected version. In 1 ps, signal travels 0.3mm. Everything has to be on one die (as in die in a chip) as propagation delay in cabling alone will add enough errors.
(I'm sorry tvb.... for creating more job for you to do) --------------------------------------- (Mr.) Taka Kamiya KB4EMF / ex JF2DKG On Wednesday, December 4, 2019, 3:07:34 PM EST, Taka Kamiya via time-nuts <time-nuts@lists.febo.com> wrote: Also, at that speed, signal travels 0.3mm per second, assuming zero velocity factor..... Everything will have to be on chip scale to realize that. --------------------------------------- (Mr.) Taka Kamiya KB4EMF / ex JF2DKG On Wednesday, December 4, 2019, 11:01:12 AM EST, Tom Van Baak <t...@leapsecond.com> wrote: Martyn, > I'm always being asked to provide equipment that can produce two 1 > pps outputs aligned to each other to within a few ps. They should look at their best 1PPS on a 'scope. You can get ns with care; I doubt ps is possible. I mean, that's THz BW isn't it? Can you share with us what their application is? > So they are asking for two of my GNSS frequency standards with 1 pps > outputs. > > The 1 pps outputs being derived from the rubidium oscillator (which > is aligned to GPS/GNSS) > > The best I think I can achieve is in the low ns range. Right. It will be ns, not ps. Forget about using GNSS for ps level timing. > Does anyone know how this can be achieved? Google for papers by high-end national timing laboratories. Words like: active temperature stabilized (phase stabilized) bidirectional optical fiber links. Very possible, very expensive, quite common now. I'd guess most of the timing centers in Europe are linked this way. /tvb On 12/4/2019 1:40 AM, mar...@ptsyst.com wrote: > Hello, > > > > I'm always being asked to provide equipment that can produce two 1 pps > outputs aligned to each other to within a few ps. > > > > These two 1 pps pulses are not in the same location and could be 100 metres > to a few km away. > > > > So they are asking for two of my GNSS frequency standards with 1 pps > outputs. > > > > The 1 pps outputs being derived from the rubidium oscillator (which is > aligned to GPS/GNSS) > > > > The best I think I can achieve is in the low ns range. > > > > Does anyone know how this can be achieved? > > > > Regards > > > > Martyn > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.