[Voyage-linux] Re: PPS kernel patches

[Mark Phillips]

Any thoughts/comments on this Punky?



On Mon, 2007-12-10 at 14:33 -0500, Mark Phillips wrote:
> I have mine setup in a similar way but it is not a true time server in
> that because of the lack of a disciplining kick on a regular basis it is
> able to drift between time updates.
> 
> The problem with NMEA time strings is that they tend to come in a
> cluster and not at all every second or 3 seconds or 5 seconds. They come
> along whenever the GPS processor has time to spit them out.
> 
> The 1PPS pulse from the GPS system is not derived from the decoded data
> but rather is an inherant component of the GPS signal along with the
> 10KHz pulse and thus is more reliable.
> 
> I'd still like to see a 1PPS patched kernel particularly as it would
> then allow for connections to things like Frequency Standards and LORAN
> RX's etc. Heck, one could even connect it up to the mains after a very
> simple signal divider (trick used on clock radios etc) is added.
> 
> Mark 
> 
> On Thu, 2007-12-06 at 19:24 +0800, Kim-man 'Punky' TSE wrote:
> > Hi guys,
> > 
> > Forget to mention, I have setup voyage attached to Garmin GPS18/USB and 
> > get NTP time sync'd.  Of course, this device is not PPS-capable, but it 
> > works without any patch to the kernel and NTP daemon.   See my blog article:
> > 
> >     http://www.punknix.com/?q=node/116
> > 
> > Regards,
> > Punky
> > 
> > Mark Phillips wrote:
> > > Now I think about it, updating the gpsd package would also be useful for
> > > this purpose.
> > >
> > > FYI, my NTP server is running Voyage on a Neoware N3000 thin client
> > > (ebay $20). It has a 300MHz via processor in it as well as an IDE
> > > interface which is now running a CF card. The GPS RX plugs into ttyS0
> > > and I'm running gpspipe on ttyS1 to allow my Nixie tube clock to correct
> > > itself.
> > >
> > > Mark
> > >
> > > On Fri, 2007-11-30 at 05:10 +0000, Clark wrote:
> > >   
> > >> Mark Phillips <g7ltt at ...> writes:
> > >>
> > >>     
> > >>> Hi all,
> > >>>
> > >>> Is there anywhere that I can register a feature request for adding PPS
> > >>> to the kernel for use in NTP apps? This would be really handy I think.
> > >>>
> > >>> Thanks
> > >>>
> > >>> Mark
> > >>>
> > >>>       
> > >> I would really like that too!  
> > >>
> > >> I have been using Voyage to try to create an NTP appliance  'cause the
> > >> commercial ones are WAY beyond my budget!
> > >>
> > >> I appreciate the work on Voyage so far!
> > >>
> > >> Thanks!
> > >>
> > >>
> > >> _______________________________________________
> > >> Voyage-linux mailing list
> > >> Voyage-linux at list.voyage.hk
> > >> http://list.voyage.hk/mailman/listinfo/voyage-linux
> > >>     
> > 
> > 
-- 



Mark Phillips, G7LTT/NI2O
Randolph, NJ