On Wed, 10 Mar 2021 06:39:46 -0800 "Charlie" <char...@drhabekost.com> wrote:
> My question is thus: It seems that procuring a more precise PPS/time output > unit is quite a bit more costly than what I have; even more costly is a unit > that has both more precise PPS/time output, The question is more whether it is good enough. How accurate do you need your time? How precise does it need to be? If the answer to both questions is smaller than 100ns, then you are good with anything you can get your hands on, even the cheapest GPS receiver. If you need better than that, you need to look more closely and calculate each contributor to uncertainty, both random and systematic and see where you can and want to improve (or compromise). > and a really stable 10 Mhz > output ( I might add that I am a Ham, where 1 uhz error is detrimental). At what time scales you need that 1µHz stability? Is it for a few seconds? Or over a few hours? How accurate does it have to be? And are you sure it is really 1µHz @ 10MHz? Because that's a stability better than 1e-13. Which isn't something most people just have in their lab. You need a an exceptionally good OCXO to reach down there (an OCXO that costs you as much as a car) and even those reach it only over a very limited τ between about 1s and maybe 100s. Beyond a τ of 1000s you have the option of using a HP5065, possibly with Corby's Super-HP6065 modifications. Even GPS takes until somwhere like 100ks to reach down to 1e-13. If you need better than that, either at shorter or longer τ, then we are clearly deep in atomic clock territory. Either hydrogen maser. caesium beam standard or cold atomic clock. Attila Kinali -- The driving force behind research is the question: "Why?" There are things we don't understand and things we always wonder about. And that's why we do research. -- Kobayashi Makoto _______________________________________________ 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.