Hi I would be careful with that paper since part of what it says is not (in general) correct.
Bob > On Jun 8, 2022, at 1:22 PM, Ross P via time-nuts <time-nuts@lists.febo.com> > wrote: > > Hi,Thank you very much, this paper answered some questions. > > On Wednesday, June 8, 2022 at 12:38:04 PM PDT, Hans-Georg Lehnard via > time-nuts <time-nuts@lists.febo.com> wrote: > > Hi, > > read this paper from Connor-Winfield about differences AT/SC cuts. > > http://www.conwin.com/pdfs/at_or_sc_for_ocxo.pdf > > Am 2022-06-08 04:04, schrieb Ross P via time-nuts: > >> Hello,My first post.I have created a 64-bit frequency counter, 15.9 digits >> after converting to floating point. >> Oscillator random walk is +- 0.01 ppm with an SC cut crystal at 10 Hz >> filtered, and 0.1 ppm with at cut.Is it the crystal or the oscillator >> electronics (inside a can) that determines the noise?The oscillators I am >> using are 1 double oven SC 10 MHz vs 1 single oven AT cut 10 MHz in one >> test,and 2 generic crystal oscillators (on a Terasic DE1 cyclone II FPGA >> board) for the other test.I assume the single oven oscillator will have >> better stability than commodity oscillators.I am able to chart random walk >> at up to a few thousand samples per second at full double >> precisionresolution, and FFT shows some alien tones in the walk pattern that >> come and go suddenly, I thinkdue to oscillating mode changes in the >> oscillator itself, mostly show in the commodity crystals.My question is: is >> the SC quartz the most stable for random walk.I would like to know if such a >> frequency counter / alien to detector is useful enough to be producedfor >> sale? It would require at least 3 separate frequencies of > refer >> ence time standards and > 50Klogic elements in the FPGA for 3 cross coupled >> monitors to cover a range of 0 to 50 MHz. >> Quite a risk if no one needs it. 3 separate high stability reference >> oscillators are expensive.rp >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@lists.febo.com >> To unsubscribe send an email to time-nuts-le...@lists.febo.com > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-le...@lists.febo.com > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe send an email to time-nuts-le...@lists.febo.com _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com
