Hi You can indeed do this, the question is - do you *really* want to?
Depending a bit on your GPS module, the 1 pps output can jump around a few nanoseconds on a second to second basis. Keeping the 100 MH edge locked implies modulating the 100 MHz by at least a few ppb at some rate faster than 1 Hz. That will degrade the phase noise on the outputs more than a little …. A deeper issue is that the GPS module really isn’t reporting “GPS time” at the 1 second level. It’s reporting GPS Time + atmospheric noise. What you would be tracking is more the bounce in the atmosphere than anything that GPS actually is doing. Something like an L1 / L2 receiver would help some with this. Bob > On Jun 24, 2018, at 6:37 AM, Martyn Smith <expertengin...@live.co.uk> wrote: > > Hello, > > I am a newbie question. > > I have an application where I have a 10 MHz and 100 MHz squarewave output > from my GPS frequency standard. > > The frequency standard uses the PRS10 rubidium. The 100 MHz output is just a > 100 MHz VCO locked to the 10 MHz. > > These outputs are disciplined by the GPS's 1 pps (as far as frequency). But > they are not in phase with it. > > I need the rising edges of both the 10 MHz and 100 MHz squarewave outputs to > be aligned with the GPS 1 pps (UTC) to within 1 ns. > > Anyone already done this? I'm sure I've seen a distribution amplifier that > does this at 10 MHz. > > But the 100 MHz is actually the more important one that I need to align. > > Regards > > Steve > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > https://lists.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to https://lists.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
