> On Aug 16, 2015, at 12:31 PM, Tom Van Baak <[email protected]> wrote: > > Anyway, to answer your question -- to measure its true performance you only > need two things. 1) a phase meter (or time interval counter) that's good to 1 > ns or better, and 2) a local reference standard that's maybe 10x better than > the TCXO and the Adafruit GPS. Usually that means a cesium standard, or > supremely qualified GPSDO, or equivalent.
I have a frequency counter, but it’s not a phase meter. I have a scope, but I assume that trying to use a ruler with scope traces isn’t the textbook way of doing that. :D I have considered in the past buying a used rubidium standard off eBay, but have hesitated because I don’t know how much life there is left in the tube, and I just have to take it on faith that it’s stable and accurate. I have somewhat more faith in the GPS PPS, but clearly that has limits. > > A number of us here on the time-nuts list have such equipment at home. And > unlike professional labs, we will do it for free/fun if you loan the GPSDO > for a week. I will happily *give* one to someone if they would be willing to help a relative newbie with this stuff. Just one though. They’re kind of expensive to build. :D _______________________________________________ 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.
