[time-nuts] Home made GPS disciplined atomic clock

Esa Heikkinen scifiscifi at sci.fi
Sun Jan 25 14:10:57 EST 2009


> Do not forget the Trimble was never intended to be a frequency standard.

Ok, then it might be a better idea to use only it's 1 PPS output to 
count the frequency of the some other oscillator and build own steering 
electronics for that. Infact my original plan was to do right that.

If the count/steering period is set long enough there should be any 
problem caused the satellite hopping or such things anymore. Let's say 
that if I make 24 hours running average for 10 MHz using Trimble's 1 PPS 
as a reference to determine the oscillator control then I would get the 
better results, right?

But if LPRO is useless, which oscillator should I seek for main output? 
With low short therm drift and good phase noise characteristics etc?

Also the goal is to build the reference with surplus (etc) parts as a 
hobby project, no interest to invest thousands for that.

-- 
73s!
Esa
OH4KJU




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