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

Didier Juges shalimr9 at gmail.com
Mon Jan 30 21:17:35 EST 2012


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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