[time-nuts] IRIG B(1) sample wav file

[Predrag Dukic]

Well, for my application, probably 1 ms is sufficient. Is it possible

with NMEATime alone, without any additional hardware?

That is what was my question about in the first place.

Thanks for all other suggestions, they will certainly be used in the future,

but NMEATime looks like my solution for 1ms.

 From the NMEATime page it seems it uses bit-banging for PPS signal,

possibly triggering serial interrupt directly.  If that is true,

it could even be better than 1 ms. (?)


P. Dukic






At 10:35 2.11.2009, you wrote:
>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-bounces at febo.com [mailto:time-nuts-bounces at 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.
> > >
> > >
> > >
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