[time-nuts] FE-5680A Mechanical Question

David davidwhess at gmail.com
Thu Jan 12 09:10:56 EST 2012


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" <jltran at 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-bounces at febo.com [mailto:time-nuts-bounces at 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" <jltran at 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.
>
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