-------- Pluess, Tobias writes: > In my very first GPSDO I built, I used a STM32F303. This one had a quite > bad PLL stability, the frequency was varying over time in a sawtooth like > manner for some reason.
It's called "spread-spectrum" and is done deliberately to game the EMI criteria for various certifications. By sweeping the frequency through a range, the peak energy of any one frequency, as averaged over a second, drops correspondingly. In many cases you can actually disable it, but you may have to punk the manufacturer quite hard to find out what bit to set or clear. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [email protected] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ time-nuts mailing list -- [email protected] -- To unsubscribe send an email to [email protected] To unsubscribe, go to and follow the instructions there.
