[time-nuts] GPS for Nixie Clock

Bob Camp kb8tq at n1k.org
Fri Jul 15 19:14:31 EDT 2016


The only practical way to do a “filter” is with a flywheel oscillator. You will need at least a TCXO to hold the ADEV
somewhere reasonable while the system it doing its thing. Something VCO based will not do the job.


> On Jul 15, 2016, at 6:53 PM, John Swenson <johnswenson1 at comcast.net> wrote:
> Yep, that is theory. The fun part is going to be getting the right edge for the new PPS. Half the time it will the one before the PPS from the GPS and half the time it will be the one after. From the sawtooth data I should be able to figure out which is which to align it to the new LO.
> John S.
> On 7/15/2016 3:17 PM, Bob Camp wrote:
>> Hi
>> If you are going to go “full boat” then you probably should get the sawtooth correction out of
>> the GPS and feed that into your control loop. You will need something you can run out at the
>> “few hundred seconds” sort of time constant.
>> Bob
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