[time-nuts] GPS Timing Source -- looking at buying

Chris H timenuts at archnetnz.com
Fri Jul 9 19:10:35 EDT 2010


Yeah the AES / EBU timing is just to sync clocks in house, it's not
actually going to be used as a genlock source for equipment.. just slave
clock displays...



On Fri, 2010-07-09 at 08:38 -0400, Bob Camp wrote:
> Hi
> 
> The Thunderbolt has a GPS and an OCXO inside it. It's built in smarts align a PPS created from the OCXO to the GPS PPS. This allows the PPS to be more stable than a normal GPS PPS (less jitter). It also provides holdover on the PPS if and when GPS sat's are not available. 
> 
> Since your ultimate objective is (I think) AES / EBU timing, jitter is an important consideration.
> 
> Bob
> 
> 
> On Jul 9, 2010, at 3:10 AM, Chris H wrote:
> 
> > I might go for the Garmin one to start with, and see how it all works..
> > and then move up to a more reliable source of timing source in the
> > future...
> > 
> > When you say Reliable, what exactly do you all mean---
> > does it loose time? 
> > Does it loose lock to the satellites?
> > because it's only millisecond accurate, is that your concerns....
> > 
> > Please correct me if I am wrong: 
> > 
> > If it's pulsing every second, and that second is generated by the lock
> > to the satellite, then should it not be as accurate as the device that
> > it's getting it's lock from?
> > 
> > (Sorry I am new to all this)
> > 
> > 
> > On Fri, 2010-07-09 at 19:02 +1200, Chris H wrote:
> >> Yes sorry -- stratum 1 -- brain fart :(
> >> 
> >> 
> >> 
> >> On Fri, 2010-07-09 at 06:32 +0000, Paul Nicholson wrote:
> >>> Chris H wrote:
> >>>> Would be good as a timing source for GPS
> >>>> ... make a PC into a Stratum 0 timing device?
> >>> 
> >>> I think it would count as stratum 1, since you are 1 hop
> >>> away from a master time source.
> >>> 
> >>> This page may be of interest,
> >>> 
> >>>  http://www.satsignal.eu/ntp/FreeBSD-GPS-PPS.htm
> >>> 
> >>> Trimble Thunderbolts have been recommended on this list as a
> >>> proper timing grade GPS, superior to these EOM Garmin GPS units.
> >>> 
> >>> There's a reliable source of Thunderbolts on E-bay.  I currently
> >>> have one of these on order,
> >>> 
> >>>  http://cgi.ebay.co.uk/290322053618
> >>> --
> >>> Paul Nicholson
> >>> --
> >>> 
> >>> 
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> >> 
> >> 
> >> 
> >> 
> >> 
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> > 
> > 
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