Didier Juges wrote: > Magnus Danielson wrote: > >> You can acheive much greater speedup by a combined frequency/phase approach. >> You will get a very accurate frequency error estimate, so you will very >> quickly be close enought to go into phase lock. At least if your clock isn't >> too noisy. So, the lock-in time should not be the major concern, but rather >> the behaviour of the full setup when running. Also, another classic trick is >> to vary the bandwidth, so you have a much wider bandwidth in the beginning >> and >> then step down towards your target bandwidth as some suitable conditions have >> been met prior to the step. >> >> >> > My concern is that closing the loop faster by itself does nothing, if it > is not stable enough. What I meant by being able to close the loop > sooner was that the carrier phase data is actually better than the OCXO > sooner after power up. I think you or Bruce said the Allan variance of > the carrier phase signal could be as good as e-10 in 1 second, or > something like that. > Didier
Typically with a good local oscillator you can do even better than that, around 1E-11 in 1 sec is achievable and has been achieved. Even with the on board TCXO typically 3E-11 or so in 1s is achieved. Bruce _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
