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

EWKehren at aol.com EWKehren at aol.com
Mon Jan 30 05:43:18 EST 2012


Where can you get a LEA-6T for $ 65?
Bert Kehren
 
 
In a message dated 1/30/2012 5:34:56 A.M. Eastern Standard Time,  
bruce.griffiths at xtra.co.nz writes:

The  100PPS output from Motorola receivers is phase jerked every second 
in the  same fashion.

Bruce

Azelio Boriani 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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