[time-nuts] 10MHz Rubidium reference source for frequencycounter

Didier Juges shalimr9 at gmail.com
Mon Nov 3 21:26:41 EST 2014


You can always upload time-related material to my Manuals page:


Didier KO4BB

On November 3, 2014 2:43:47 PM CST, Charles Steinmetz <csteinmetz at yandex.com> wrote:
>Tom wrote:
>>As I understand it, his project is to use the high frequency output 
>>of a ublox NEO-7M to discipline a MV89 with a James Miller-style
>analog PLL.
>>    *   *   *
>>(perhaps someone can post an English translation for us)
>I have a machine-translated PDF (~2.5MB), but nowhere to put it 
>up.  If you have web space for it, please feel free to do so 
>(assuming that Karen does not object).
>I have reservations about the potential of any Miller-style GPSDO, 
>because using an analog PLL essentially guarantees that the crossover 
>to GPS will be at a tau orders of magnitude lower than it should be 
>-- the Miller unit crosses over about 3 OOM too low (see attached 
>plot, from <http://www.leapsecond.com/pages/gpsdo/>).
>The beloved Thunderbolt also crosses over about 2.5 OOM too early, if 
>you use the factory loop settings (id.).  But it has an ADPLL with 
>adjustable parameters, so a time nut can tune the loop for best 
>performance with the particular OCXO in the unit.  (See 
>Best regards,
>time-nuts mailing list -- time-nuts at febo.com
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