maybe the measurement principle is similar to the PicoPak? http://www.stable32.com/PicoPak%20App%20Notes%20Links.htm
Do open it up! And send a high resolution picture to the ist ;) A. On Sat, Aug 31, 2019 at 1:11 AM Mark Sims <hol...@hotmail.com> wrote: > (Hopefully this is not a duplicate post... hotmail has been having issues) > > The FA1 is a small, USB powered frequency counter. You supply it with a > 10 MHz reference and an input frequency of 1 .. 80 MHz. It outputs a text > string of the measured frequency every second. They cost around $80 .. > $120. > > Apparently there is a PLL inside... the text string has a "PLL unlock" > flag. There is no info on how it works and I have not opened mine up. > > I did a simple noise test on one where the input and ref clocks were from > a Tbolt. It looks like the measurement noise is around +/- 0.0002 Hz. > > Lady Heather can now read it. Attached is a screen capture of the noise > test._______________________________________________ > 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. > _______________________________________________ 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.
