[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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