>> One of the questions I've needed to answers is just how good is good enough >> when it comes to making a high performance GPSDO.
>There is no single answer to this. One man's high-performance >is another man's low-performance. It all depends on where you >are in your quest. >> Some of the self build units I've heard being used can be 100 to 1000 or >> more >> times worse than desired for best performance. >> >> WarrenS >That is correct. Because time can be measured more precisely >than any other physical quantities it is quite normal for amateur >projects or even professional products to span many orders of >magnitude in performance. It is also true that the requirements >have as great a span. Someone needing a time source simply >for NTP (milliseconds) can get by with a solution a million times >less precise than someone trying to tune the C-field of their own >cesium standard (nanoseconds). > >/tvb **************** My mistake, I should not of assumed as I did, that everyone would understand what "good enough" means for a "high performance GPSDO". Good enough means: so as NOT to degrade the limited and available accuracy of the GSP signal. i.e at least 3 to 6 db better than the noise. The correct answer is not a function of the user, it is a function of the GPS signal. Warren _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
