[time-nuts] Is possible precise 1pps?

Azelio Boriani azelio.boriani at screen.it
Wed Mar 13 18:03:37 EDT 2013

so we can see that position hold -> can use down to one satellite, sawtooth
correction -> we can squeeze the most out of the PPS precision, whatever
receiver (navigation/timing/other) we have. Good to know that the NEO-6M
navigation receiver has the sawtooth correction.

On Wed, Mar 13, 2013 at 7:42 PM, Michael Tharp <gxti at partiallystapled.com>wrote:

> 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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