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.
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