Interesting I am unaware of any amateur service requiring that tight of a timing relationship. At least modern PC clocks do not drift that badly in a few minutes. So it is pretty odd. Without further detail I am at a loss for why you need to do that. Maybe he is tinkering with spreadspectrum? Regards Paul
On Wed, Nov 7, 2012 at 5:04 PM, David <[email protected]> wrote: > Some Windows NTP clients like Tardis can calculate and implement a > clock frequency adjustment instead of stepping the clock if the time > adjustment is below a specified limit. If he was using an application > that was upset by the time being stepped, then that might allow less > frequent updates. > > If he is polling that often to maintain accurate time, then I would > assume he is using a local known to be accurate NTP server. > > There are Windows NTP clients which will synchronize to GPS PPS time. > That should be better than stock hardware and Windows can handle > anyway. Something like a Garmin GPS18 is specified to be within 1uS > and has a pulse to pulse jitter in the 10s of nanoseconds. > > On Wed, 7 Nov 2012 21:41:36 +0000, David Kirkby > <[email protected]> wrote: > > >Someone at my radio club uses some mode of operation where accurate > >time is required. He said the standard Windoze clock does not keep > >sufficiently accurate, so he has software which updates from an NTP > >server every 4 seconds or so. It's not exactly a denial of service > >(DOS) attack, but seems almost close to it in NTP terms to me. I can't > >really believe updating every few seconds is sensible myself, but he > >assures me it works very well. (I'm rather hoping it does not use a > >stratum 1 server!) > > > >I'm sure someone will say if you want accurate time on a PC, to use > >some combination of GPS, rubidium or OCXO with a 1 pps pulse and a > >serial port on a FreeBSD or similar computer. But that's probably not > >practical if your software only works on Windoze. > > > >Any comments? > > > >Dave, G8WRB. > > > >_______________________________________________ > >time-nuts mailing list -- [email protected] > >To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
