[time-nuts] Using a frequency synthesizer replacement for motherboard oscillator

Bob Camp lists at rtty.us
Sat Dec 1 00:26:29 UTC 2012


In the case of the Soekris, it was not the real time clock that we all played with. THe clock you fiddle is the CPU clock. The system is running FreeBSD or Lunix, so it's a cut above a typical embedded system. A RTOS (like Windows CE) will indeed do a bit better with a good CPU clock. Anything like conventional Windows will still have issues, even with a good clock.


On Nov 30, 2012, at 7:10 PM, Sarah White <kuzetsa at gmail.com> wrote:

> On 11/30/2012 6:30 PM, Eric Garner wrote:
>> the actual RTC on modern (Intel based) PC's is driven from a standard
>> 32,768 Hz crystal attached to the PCH. some of them are in incredibly small
>> packages now instead of the old tuning fork-in-a-can ones. peeling off the
>> load caps and crystal from the board would allow you plenty of spaces to
>> tack down a lead from an external synthesizer.
> Yeah, the one on the (Soekis) example was pretty small. So far none of
> of the replies have indicated that anyone on here has experience beyond
> an embedded system.
> Mostly I started this thread because there have been a few with people
> discussing implementing NTP on embedded microcontrollers, arduino, etc.
> and I was thinking of doing it from the other side (turning a nice-ish
> server into a rock-solid timekeeper)
> Thanks so far everyone. Really impressed that I already managed to get
> 4x replies so quickly :)
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.

More information about the time-nuts mailing list