[time-nuts] I've been thinking about a GPS receiver experiment

Dana Whitlow k8yumdoober at gmail.com
Wed Oct 25 20:24:11 EDT 2017


What "naughty schoolboy"?  How else is one supposed to learn feedback
theory?

Dana

On Wed, Oct 25, 2017 at 6:30 PM, Mark Sims <holrum at hotmail.com> wrote:

> >  No, you set up an oscillator so that is why you have that problem.
>
> I hooked the two rubidiums together just to see what would happen.   It
> pretty much did what I expected... chaos...   the time-nut equivalent of a
> naughty schoolboy putting a microphone up to the speaker of the public
> address system.  I't's a tough job, but somebody gotta do it  ;-)
>
>
> >  No, not really. The rubidium would be the real hold-over clock.
>
> Symmetricom calls the disciplining state where it can't lock to the 1PPS
> signal the "holdover" state.  It's sort of like a GPSDO holdover state.
> Their discipline firmware does let you set the time constant and damping
> values.  I tried a little playing around with them, but never found any
> settings that worked consistently well with the LEA-5T.
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