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

[Chris Albertson]

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