I was more interested in the technical details of how to adjust the output of a RbO without sacrificing the short and long term stability. I have seen a few designs that used a DDS to generate the 10 MHz output which lends itself to this but they all suffer from DDS and tuning noise. I see now that the RbO can be adjusted with an external magnetic field.
On Thu, 12 Jan 2012 07:34:44 -0600, "J. L. Trantham" <jlt...@att.net> wrote: >David, > >I have been following discussions on the list about a GPSDRbO for a year or >so. Some interesting challenges and probably best implemented in a 'stable' >environment rather than portable operation but as best I can tell, it would >require a very stable and good antenna location, stable and clean power, and >I was thinking of using something like an LPRO-101 with an Ext C Field >input, a Shera type controller, and a GPS timing receiver, though, I suspect >there are likely to be some 'multi-tasking' receivers out there that will >look at several sources including GPS, GLOSNASS, etc. > >While the project might be fun, for portable work, it is likely far easier >and probably just as good (almost), to use a Tbolt. > >In any event, something to think about for the future. > >Joe > >-----Original Message----- >From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On >Behalf Of David >Sent: Wednesday, January 11, 2012 11:12 PM >To: Discussion of precise time and frequency measurement >Subject: Re: [time-nuts] FE-5680A Mechanical Question > > >How would a GPSDRbO work? Phase lock the DDS output to the GPS? Phase lock >a VCXO to the GPS and then phase lock to the RbO on loss of GPS lock? > >On Wed, 11 Jan 2012 22:55:58 -0600, "J. L. Trantham" <jlt...@att.net> >wrote: > >>Bill, Brian, Bill, and Peter, >> >>Thanks for the info. All I need now is a 'project' to incorporate the >>unit into. >> >>In the back of my mind, I have the thought of a 'box' that will be >>battery powered or 110 VAC powered (perhaps with an internal SLA >>battery) and include a GPSDO and Rb unit (possibly a GPSDRbO) for the >>purpose of a 'reference' for portable operation in the microwave >>regions. > >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to >https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. > > >_______________________________________________ >time-nuts mailing list -- time-nuts@febo.com >To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
