[time-nuts] GPSDO using 100Hz
Mike Monett
XDE-L2G3 at myamail.com
Tue Nov 25 00:20:07 UTC 2008
> Mike
> Note: I gave you a simple example of why it is not possible to
> just buffer the High Freq osc . The actual working get a bit more
> complicated.
> In short when it is time to give out the next pulse whether it is
> 1 Hz or 100 Hz It sends it outs as close as possible to the
> correct time, using some internal clock. What I have seen on the
> Oncore is that this causes a peak of +- 50ns of jitter. It works
> the same with the 100Hz or the 1 Hz, both have the same peak to
> peak rising edge jitter, which is different for each pulse sent.
> The 1Hz timing error message it sends out has little to do with
> the 100 Hz timing.
> And is not relevant when using the 100Hz except for a few advanced
> alising issues.
> I hope that answers your questions. Can I ask why the interest?
> Warren
Ok, it seems they are calculating the best time for each 100Hz pulse
individually. That makes life a bit easier for a PLL.
My interest is I have a totally new way of locking to the 1PPS pulse
that should improve the performance dramatically. The question is
would it also work with a 100Hz signal.
The answer is yes. It would also work with a 10KHz signal, but this
would require a bit more horsepower. I was planning on using a
simple inexpensive microprocessor for everything but I don't know if
it would be fast enough to do 10KHz.
But there's not many of those around anymore, are there?
Best Regards,
Mike Monett
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