Well, yes. No one would rely on a windows PC for timing accuracy, surely This is what I did to get a fully coherent timing and frequency locked system for a narrowband LF receiver using an FTDI interface to a PC. http://g4jnt.com/Coherent_LF_Receiver.pdf
Andy www.g4jnt.com On Fri, 5 Nov 2021 at 18:44, Bill Dailey <docdai...@gmail.com> wrote: > There is significant jitter using USB for timing. Has been done poorly > for a long time. Well known. > > Bill Dailey > > Negativity always wins the short game. But positivity wins the long game. > - Gary Vaynerchuk > > Don’t be easy to understand, > Be impossible to misunderstand > - Steve Sims > > > On Nov 5, 2021, at 1:33 PM, Andy Talbot <andy.g4...@gmail.com> wrote: > > > > Use FTDI USB serial ports - you can't go wrong with them. > > https://ftdichip.com/ > > > > I have, at the last count, used something like 200 of their FT232 device > in > > one form or another on the shack PC. I know that, because device > manager > > has registered up to COM200. Every time a new one is plugged in, a new > COM > > port is set up. > > > > Andy > > www.g4jnt.com > > > > > > > >> On Fri, 5 Nov 2021 at 18:26, Alec Teal <a...@unifiedmathematics.com> > wrote: > >> > >> A friend of mine who lives and breaths this stuff (I wont tell you what > >> he does - but suffice to say he's authoritative) basically said to me on > >> something about serial ports that you can't go wrong with USB stuff, > >> even on Linux. > >> > >> Would that work? > >> > >> Serial ports certainly are getting scarce! You'd get 2 to a board an > >> embarrassingly long time ago! > >> > >>> On 05/11/2021 06:10, Darren Freeman wrote: > >>> On Thu, 2021-11-04 at 22:36 -0700, Rich Wales wrote: > >>>> However, mobos with a serial port are becoming harder to find. > >>> That's not really been my experience, they just moved it to a header. > >>> You will need to supply a DE9 to ribbon cable, say on a bracket, or > >>> installed in a cutout elsewhere in the case. > >>> > >>> This is the first one that I checked, and it has such a port labelled > >>> COMA, along the left/bottom edge. > >>> https://www.gigabyte.com/Motherboard/B450-AORUS-M-rev-1x/sp#sp > >>> > >>> Also note that the Linux PPS driver supports the standard PC parallel > >>> port, which you can usually find as a header. If you are having > >>> performance issues with one, try the other. (But you may need to supply > >>> negative-going edges to the parallel port.) > >>> > >>> > >>> Have fun, > >>> Darren > >>> _______________________________________________ > >>> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe > >> send an email to time-nuts-le...@lists.febo.com > >>> To unsubscribe, go to and follow the instructions there. > >>> > >> _______________________________________________ > >> time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe > send > >> an email to time-nuts-le...@lists.febo.com > >> To unsubscribe, go to and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe > send an email to time-nuts-le...@lists.febo.com > > To unsubscribe, go to and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send > an email to time-nuts-le...@lists.febo.com > To unsubscribe, go to and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.