[time-nuts] Is possible precise 1pps?

Michael Tharp gxti at partiallystapled.com
Wed Mar 13 14:42:03 EDT 2013

On 3/13/2013 13:15, Azelio Boriani wrote:
> Then you will start to
> appreciate things that will lead you to a timing receiver with the sawtooth
> correction.

For what it's worth: I have been evaluating the NEO-6M, a navigation 
receiver, for use in a NTP server which I have posted here in the past. 
It seems to perform quite well. It *does* have sawtooth correction, 
probably because it has a timing cousin (NEO-6T), and is stable enough 
to get RMS jitter to sub-10ns where the "noise floor" of my input 
capture is. It does not, however, have position hold (they have to have 
*some* reason to charge triple the price for a 6T) so over moderate 
timescales it might wander slightly more.

Would I use 6M in a GPSDO? Probably not. But the PPS is pretty good, and 
some navigation receivers *do* have sawtooth correction, which I guess 
was really the point I was getting at.

-- m. tharp

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