I am purchasing TCXOs from a reputable supplier and building boards to install in Ham radios. Every one is indeed different. They also exhibit hysteresis, sometimes very strong, more than the variation with temperature. They test in one direction and meet the .25 ppm variation spec over temp, but if you change the temp in the other direction, it may be .50 ppm offset from what was measured in the other direction. They also drift with time, several ppm over a year. I also see frequency jumps, likely due to whatever digital process is used inside the TCXO.
Mark On Thu, Aug 1, 2019 at 6:04 AM Bob kb8tq <[email protected]> wrote: > Hi > > If you look at any sort of “TimeNut” sort of level of detail, every unit > in the batch will be different. > > Bob > > > On Aug 1, 2019, at 3:05 AM, Clint Jay <[email protected]> wrote: > > > > I'd imagine the effort required to characterise a TCXO to that level and > > add the monitoring hardware/software would put the cost in the region of > an > > OCXO but it's an interesting idea, I wonder what the variance across a > > batch would be > > > > On Thu, 1 Aug 2019, 08:01 Tom Van Baak, <[email protected]> wrote: > > > >> An email came in asking if it was possible to improve the performance of > >> a TCXO if one monitors the temperature of the PCB or enclosure and then > >> applies timekeeping corrections in s/w based on that data. I don't have > >> specific P/N or other details so treat this as a generic question. Has > >> anyone tried this? > >> > >> /tvb > >> > >> > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > > and follow the instructions there. > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
