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: [email protected] [mailto:[email protected]] 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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>-=-=-=-=-=-=-=-=-=-=-=-
>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..."
>
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