Steve, > 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.
Two comments. 1) If you divide 100 MHz -> 10 MHz -> 1 Hz then (with careful design, calibrated layout / wiring) you can have all three rising edges within 1 ns *of each other*. I assume this is your goal. If you already have a 100 MHz GPSDO then it would surprise me if the outputs are not already synchronized with each other. I mean, almost all GPSDO give a 1PPS output that is derived from the LO, by design. If your goal is 1 ns, you obviously do not want to use the raw 1PPS from the receiver. What make/model GPSDO are you using? 2) On the other hand, if your goal is that all the outputs are within 1 ns *of UTC*, then you have a big problem. Not even national timing laboratories, with a pile of cesium and H-maser references, can get their UTC(k) within 1 ns of UTC. Perhaps you can explain a bit more what you are actually doing. It sounds like an interesting application. Relative timing at the 1 ns level is easy. Absolute UTC timing at the ns level is much, much harder. /tvb ----- Original Message ----- From: "Martyn Smith" <[email protected]> To: <[email protected]> Sent: Sunday, June 24, 2018 3:37 AM Subject: [time-nuts] 1 pps Sync'ing > 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 -- [email protected] > To unsubscribe, go to > https://lists.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://lists.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
