It depends on the IRIG card used. With a basic reader card you can sync down to 1 millisecond based on the 1 KHz IRIG-B time code. More elaborate cards have a phase locked 10 MHz oscillator on board, and software to replace the PC's RTC so time comes directly from the card. Sync to a few microseconds and lower is possible. Take a look at Symmetricom (board level products originally from Datum), and Spectracom (boards originally from Odetics via KSI).
Rob Kimberley -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Predrag Dukic Sent: 31 October 2009 21:30 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] IRIG B(1) sample wav file Does anybody know what is the time difference (or error) between two PC-s set this way? (I mean the difference between two PC internal RTCs). Can this method be used to sinc two sound cards, contained in two PCs some distance apart. Predrag Dukic At 17:10 31.10.2009, you wrote: > There's a nice package called NMEATime which will generate > IRIG-B code using your sound card. > > http://www.visualgps.net/NMEATime/default.htm > > Lots of other neat software on that site as well. I bought > VisualGPS and NMEATime many moons ago. > > Happy tweaking. > >*********** REPLY SEPARATOR *********** > >On 31-Oct-09 at 15:50 Robert Atkinson wrote: > > >Hi, > >Anybody got a .wav file of a modulated IRIG-B timecode? I just want > >something to do a quick test on a display. My nomal IRIG generator is > >buried in the garage. A simple app to drive a sound card would also do. I > >know at least one of the Linux NTP implementaions can do this but I'm not > >running Linux and don't really want to do a lot of setting up, just a > >quick go/no-go check. > > > >Robert G8RPI. > > > > > > > >_______________________________________________ > >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. > > > >__________ Information from ESET Smart Security, version of virus > >signature database 4560 (20091031) __________ > > > >The message was checked by ESET Smart Security. > > > >http://www.eset.com > > >-=-=-=-=-=-=-=-=-=-=-=- >Bruce Lane, Owner & Head Hardware Heavy, >Blue Feather Technologies -- http://www.bluefeathertech.com >kyrrin (at) bluefeathertech do/t c=o=m >"Quid Malmborg in Plano..." > > >_______________________________________________ >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. > >__________ Information from ESET NOD32 Antivirus, version of virus >signature database 4561 (20091031) __________ > >The message was checked by ESET NOD32 Antivirus. > >http://www.eset.com _______________________________________________ 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.
