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

Magnus Danielson magnus at rubidium.dyndns.org
Wed Oct 25 20:07:23 EDT 2017

Hi naugthy schoolboy Mark,

On 10/26/2017 01:30 AM, Mark Sims 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  ;-)

In the music world, some really like caotic oscillators.
You just built a very expensive one. :)0

>>   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.

Well, holdover is the behavior, but a typical design can have several 
states which is deemed as hold-over. Everything else than tracking is 


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