[time-nuts] Building a GPSDO & trouble using Jupiter-T

Azelio Boriani azelio.boriani at screen.it
Tue Jan 31 04:26:15 EST 2012


OK, will check the uBlox datasheet, until now I was assuming that the uBlox
series was capable of more than 1 fix per second in navigation and in
timing.

On Tue, Jan 31, 2012 at 3:17 AM, Didier Juges <shalimr9 at gmail.com> wrote:

> You have to spend good money to get a GPS receiver capable of calculating
> it's time and/or position more than once per second. I am not aware of that
> being done for timing applications, but it is available for navigation GPS
> receivers, such as those used to track race cars (for a race car, one
> second is an eternity). I have seen navigation receivers capable of 10
> fixes/second, I am sure there are better ones yet. They cost a lot of
> money.
>
> Didier KO4BB
>
> On Mon, Jan 30, 2012 at 4:31 AM, Azelio Boriani <azelio.boriani at screen.it
> >wrote:
>
> > OK, now I know and wonder if other GPS receivers that have frequency
> > outputs behave in this manner. For example the Motorola 100PPS output,
> the
> > uBlox 800Hz, the Navsync variable frequency output and so on. It is
> > possible to compute solutions from GPS satellite at greater than 1 second
> > rate so the phase of these signals should be adjustable at a rate that
> > could minimize the phase jump... this is only my opinion, not the real
> > possibility.
> >
> > On Mon, Jan 30, 2012 at 11:15 AM, Bruce Griffiths <
> > bruce.griffiths at xtra.co.nz> wrote:
> >
> > > The 10kHz is continuous but its phase jerked on the second.
> > > The new phase is held until the next jerk.
> > >
> > > Bruce
> > >
> > >
> > > Azelio Boriani wrote:
> > >
> > >> Ah, is it a burst of 10KHz once a second? I don't have a Jupiter-T and
> > I'm
> > >> a PPS-type discplining fan but I thought it was a continuous 10KHz.
> > >>
> > >> On Mon, Jan 30, 2012 at 10:33 AM, Attila Kinali<attila at kinali.ch>
> >  wrote:
> > >>
> > >>
> > >>
> > >>> On Sun, 29 Jan 2012 00:50:35 -0600
> > >>> Ray Xu<rayxu123 at gmail.com>  wrote:
> > >>>
> > >>>
> > >>>
> > >>>> For those who have experience using the Jupiter T GPS:
> > >>>> I have bought this
> > >>>>
> > >>>>
> > >>>>
> > >>> http://www.ebay.com/itm/**Navman-jupiter-T-Tu60-GPS-Kit-**
> > >>> 1pps-10khz-GPS-Module-/**260790984470<
> >
> http://www.ebay.com/itm/Navman-jupiter-T-Tu60-GPS-Kit-1pps-10khz-GPS-Module-/260790984470
> > >
> > >>>
> > >>> Ouch... For that price you get already a new LEA-6T, which is a state
> > of
> > >>> the art timing GPS receiver. Beside having the better sensitivity
> > >>> (more satelites in difficult conditions) it features also an
> frequency
> > >>> output that can go up to 10MHz (or 8MHz if you want low jitter).
> > >>>
> > >>>
> > >>>                        Attila Kinali
> > >>> --
> > >>> The trouble with you, Shev, is you don't say anything until you've
> > saved
> > >>> up a whole truckload of damned heavy brick arguments and then you
> dump
> > >>> them all out and never look at the bleeding body mangled beneath the
> > heap
> > >>>                -- Tirin, The Dispossessed, U. Le Guin
> > >>>
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