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

Azelio Boriani azelio.boriani at screen.it
Mon Jan 30 05:31:58 EST 2012


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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>
>
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