[time-nuts] 10MHz Rubidium reference source for frequency counter

Karen Tadevosyan ra3apw at mail.ru
Tue Nov 4 04:14:02 EST 2014


Charles,

> 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 am OK with it if it might be interesting to someone...

Karen

> Date: Mon, 03 Nov 2014 15:43:47 -0500
> From: Charles Steinmetz <csteinmetz at yandex.com>
> 
> 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)
> 
> Tom,
> 
> 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
> <http://www.ke5fx.com/tbolt.htm>.)
> 
> Best regards,
> 
> Charles
> 
> 
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