[time-nuts] Advise on building a DIY GPSDO?

Attila Kinali attila at kinali.ch
Mon Apr 4 23:27:13 UTC 2016


On Mon, 4 Apr 2016 17:56:29 -0400
Bob Camp <kb8tq at n1k.org> wrote:

> The variable frequency output on the uBlox (and other) GPS receivers
> has come up many times in the past. 
> If you dig into the archives you can find quite a bit of data on the
> (lack of) performance of the high(er) frequency outputs from the various GPS
> modules. They all depend on cycle add / drop at the frequency of their free
> running TCXO. Regardless of the output frequency, that will put a *lot* of
> jitter into the output. 

That's why you should put the output frequency of the ublox modules
to an integer divisor of 24MHz. Ie 8MHz works but not 10MHz.

			Attila Kinali

-- 
It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
                 -- Miss Matheson, The Diamond Age, Neil Stephenson



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