Keep in mind, SMPTE/EBU is timecode, AES/EBU is digital audio. 3 orders of magnitude difference in the bit rates. Chris was talking timecode. Ed
-----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Bob Camp Sent: Friday, July 09, 2010 8:38 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] GPS Timing Source -- looking at buying 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 >>> -- >>> >>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> >> >> >> >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.