[time-nuts] Is it sensible to update every few seconds from NTP server?

[paul swed]

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 <davidwhess at gmail.com> 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
> <david.kirkby at onetel.net> 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.
> >
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