[time-nuts] Disciplining Rubidium

Bruce Griffiths bruce.griffiths at xtra.co.nz
Thu Apr 24 17:42:50 EDT 2008

Björn Gabrielsson wrote:
> On Thu, 2008-04-24 at 02:16 -0400, SAIDJACK at aol.com wrote:
>> Hi Bruce,
>> either way GPS can't give you parts to the 14 short term as was  claimed. 
>> Also there are not many affordable carrier phase GPS receivers out  there as far 
>> as I know.
> Hi Said,
> What is affordable for you?
> For some $330 you can get a L1 GPS receiver outputting carrier phase
> measurements at 5Hz. This receiver also have a 10MHz tcxo driving the
> whole receiver. Pseudorange measurement rms of a few dm. Carrierphase
> rms below 1cm.
> Btw... the Oncore VP did carrierphase measurements.
> --
>    Björn
Even the Rockwell/Connexant Jupiter GPS receivers have carrier phase 
measurement capability.
However you will need to replace the 10.95MHz crystal with a 10.95Mhz 
source phase locked to the OCXO being disciplined.
The 3.3V version of this module has been available at very low cost from 
time to time on ebay.
Whilst not suitable for production purposes they should be more than 
adequate for experimental purposes.


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