[time-nuts] Thunderbolt?

Azelio Boriani azelio.boriani at screen.it
Fri Dec 30 06:20:29 EST 2011

The analog computer is the standard good-old-PLL: if you have the 10KHz
from a Jupiter than your analog filter will be simple to build. If you have
only the PPS (or 100PPS from an Oncore) your analog filter will require
more attention (and large capacitors) but I think it is realizable. You
analog computer is the integrating filter out of the phase detector. The
phase detector, made from JK flip-flops so quite digital, gives you an
analog pulse whose length is be integrated to derive the EFC voltage for
the OCXO. You are analog right out of the phase detector.

On Fri, Dec 30, 2011 at 3:35 AM, Chris Albertson
<albertson.chris at gmail.com>wrote:

> > The era of cheap Thunderbolts appears to be history.
> >
> What is the simplest GPSDO you can build?   There are many designs
> around but when the T-Bolts came out I think people lost interesting
> building.
> I think something very simple could work.  If your local oscillator is
> at all decent it will not loose or gain full cycle in one second.  So
> I think you only need to compare the phase of the oscillator and the
> PPS.   Would an analog controller work?   I do software all day every
> day at work so it would be fun to build an analog computer for a
> change.
> Chris Albertson
> Redondo Beach, California
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