[time-nuts] GPS lock of the FE5680. Current experiment and question

[paul swed]

Good question and the reason for the large counter.
If locked its a hard number and a number above or below that number is how
far its off and in what direction. Yup 24 bits was a bit crazy but it
wasn't anything to do.
That said a single 8 bit counter would have been fine given the stability
the RB seems to have all by itself.

On Fri, Feb 10, 2012 at 8:28 PM, Chris Albertson
<albertson.chris at gmail.com>wrote:

> On Fri, Feb 10, 2012 at 5:10 PM, David <davidwhess at gmail.com> wrote:
>
> > All you need for this is the flip-flop.  Clock the flip-flop with the
> > 1 PPS signal and capture whether the oscillator is leading or lagging.
>
> I can see how this can detect lock.  If the FF is the same each second
> you are good.  But if it changes how do you know the direction of the
> change?
>
> --
>
> Chris Albertson
> Redondo Beach, California
>
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