I have a dell laptop running windows 7 with a trible accutime gold gps
that runs my telescope. My timing requirements are rather modest, I'd
like to be within 10 milliseconds of the correct time, but since my
observatory isn't connected to the internet, I use the trible. My
laptop has no temperatur
Rob wrote:
> Martin Burnicki wrote:
>> In the example above the daemon could also just write
>> the sync status to the SHM segment.
>> Since the "noselect" keyword is given ntpd would poll
>> it but not try to use it as normal refclock.
>
> Yes but if I remember well the SHM clock does not hav
Martin Burnicki writes:
> Harlan Stenn wrote:
>> And the General Timestamp API (GTSAPI) project from NTF would nicely
>> wrap this information into a timestamp for you, directly.
>>
>>> For cases 2a) and 2b) there is no absolute time available from the
>>> PPS source. If a status is available this
On Fri, Aug 01, 2014 at 12:59:32PM +0200, Martin Burnicki wrote:
> Miroslav Lichvar wrote:
> >To generalize it a bit more, there could be also a case of a PPS that
> >is not locked in phase and a case of a PPS that's not even locked in
> >frequency. When only a source with poor short-term stability
Martin Burnicki wrote:
> Rob wrote:
>> Martin Burnicki wrote:
>>> This could basically work with all types of refclock, e.g.:
>>>
>>> # refclocks with PPS signal and status, but no absolute time
>>> server 127.127.8.0 noselect
>>> server 127.127.22.0 stat 127.127.8.0 # sync state from parse driv
Rob wrote:
I think your suggestions are very good.
Thanks!
Martin
--
Martin Burnicki
Meinberg Funkuhren
Bad Pyrmont
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Rob wrote:
Martin Burnicki wrote:
A reboot is a restart and on a restart you need an external source for
the seconds.
Why? The time is copied to the CMOS clock regularly, and one could
expect that during the short reboot the CMOS would not drift away so
much that the time could not be synced
Rob wrote:
Martin Burnicki wrote:
This could basically work with all types of refclock, e.g.:
# refclocks with PPS signal and status, but no absolute time
server 127.127.8.0 noselect
server 127.127.22.0 stat 127.127.8.0 # sync state from parse driver
server 127.127.28.0 noselect
server 127.1
Martin Burnicki wrote:
>>> My point is that most of the internal clocks on computers are well able
>>> to maintain the time to better than a second for a long time, even if
>>> they were freewheeling, and if disciplined by a PPS, they are able to
>>> maintain the time forever (well, until the next
Martin Burnicki wrote:
> Rob wrote:
>> Martin Burnicki wrote:
>>> This sounds good. I think we'd have to distinguish some basic cases a
>>> few of which immediately come to my mind:
>>
>> It looks good.
>>
>> What is important for my box (but maybe only for mine...) is that there
>> is some metho
Martin Burnicki wrote:
>>> A reboot is a restart and on a restart you need an external source for
>>> the seconds.
>>
>> Why? The time is copied to the CMOS clock regularly, and one could
>> expect that during the short reboot the CMOS would not drift away so
>> much that the time could not be sy
Miroslav Lichvar wrote:
On Thu, Jul 31, 2014 at 04:31:08PM +0200, Martin Burnicki wrote:
This sounds good. I think we'd have to distinguish some basic cases a few of
which immediately come to my mind:
1) A refclock provides absolute time, status, and a PPS signal
1a) The refclock contains a go
On Thu, Jul 31, 2014 at 10:43:12PM +, Rob wrote:
> William Unruh wrote:
> > I think you need to read up on the cmos clock. As I said, it reports
> > only the seconds, but is settable and "readable" to microseconds.
>
> The CMOS clock is running off a 32768Hz crystal, so no way it can be
> mo
On Thu, Jul 31, 2014 at 04:31:08PM +0200, Martin Burnicki wrote:
> This sounds good. I think we'd have to distinguish some basic cases a few of
> which immediately come to my mind:
>
> 1) A refclock provides absolute time, status, and a PPS signal
>
> 1a) The refclock contains a good oscillator,
Harlan Stenn wrote:
Martin Burnicki writes:
Miroslav Lichvar wrote:
Agreed, it would be useful to have an option to specify the PPS->time
source association for each PPS refclock directly.
In chrony, this is done with the lock refclock option. It's typically
used like this:
refclock SHM 0 off
Rob wrote:
William Unruh wrote:
On 2014-07-31, Rob wrote:
William Unruh wrote:
On 2014-07-31, Martin Burnicki wrote:
Unlike otherwise stated in this thread I don't think it's a good idea to
leave the 1 PPS signal alone disciplining the time of the NTP server.
This can easily yield unfore
William Unruh wrote:
Yes, not entirely surprizing, especially considering the way ntp is
designed right now. This is a combination of bad ntpd design, and
restart when an external source is mandatory.
I think the design was OK when it was originally invented many years
ago. However, as you can
Rob wrote:
William Unruh wrote:
On 2014-07-31, Martin Burnicki wrote:
Unlike otherwise stated in this thread I don't think it's a good idea to
leave the 1 PPS signal alone disciplining the time of the NTP server.
This can easily yield unforeseen problems, similarly as if you use an
IRIG time
Rob wrote:
Martin Burnicki wrote:
This sounds good. I think we'd have to distinguish some basic cases a
few of which immediately come to my mind:
It looks good.
What is important for my box (but maybe only for mine...) is that there
is some method to feed OK/FAULT status to ntpd without a re
Le 1 août 2014 à 00:43, Rob a écrit :
> William Unruh wrote:
>> I think you need to read up on the cmos clock. As I said, it reports
>> only the seconds, but is settable and "readable" to microseconds.
>
> The CMOS clock is running off a 32768Hz crystal, so no way it can be
> more accurately s
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