[time-nuts] Using GPS to Fine Tune a Rubidium Frequency Standard.
paulswedb at gmail.com
Fri Mar 21 14:58:13 EDT 2014
Not to often I can offer useful advice. But I know others on time-nuts have
experimented with the digital dacs in the RBs. There was program quite a
while ago that let you tweak them. Essentially it seems you can not get
them exactly on because of the DAC step function.
Granted they are crazy close, but this is time-nuts.
On Fri, Mar 21, 2014 at 2:24 PM, Chris Albertson
<albertson.chris at gmail.com>wrote:
> I'm working on doing exactly this right now. There is a "ton" of
> information on how to build a GPSDO where the oscillator is an OCXO.
> But it is almost exactly the same thing to build a "GPSDRb" The
> only change is that rather then sending a command to control a DAC
> that in turn controls the OCXO's EFC pin you send data to control the
> Rb. Also of course use some different constants.
> There seem to be two different class of Rb. One takes an EFC just
> like the OCXO so the controller looks just like a GPSDO and the other
> class of Rb accepts serial commends to adjust the frequency. These
> have an internal DAC. But either way the logic is the same.
> On Fri, Mar 21, 2014 at 6:20 AM, Anders Time <anderstime at gmail.com> wrote:
> > Does anyone have a copy of the QEX 2013 november article(Bill Kaune)
> > GPS to Fine Tune a Rubidium Frequency Standard"?
> > I´m really interested in this subject, but I can´t find this magazine in
> > Sweden. I have contacted QEX, but it is very difficult to buy
> > Have any one built this frequency standard and can tell me more about the
> > project?
> > You can access the source code for the project here:
> > /Anders
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> Chris Albertson
> Redondo Beach, California
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