[time-nuts] FE-5680A Mechanical Question

EWKehren at aol.com EWKehren at aol.com
Thu Jan 12 10:37:53 EST 2012


with the good long term performance of Rb's and the presently available  
5680A for $ 40 a Shera Type controller will make available to any one on the  
list a reference better than a Tbolt for less money than a Tbolt. Repeating 
my  self I would also add a "clean up" OCXO in order to get the very best.
Bert Kehren
 
 
In a message dated 1/12/2012 8:34:54 A.M. Eastern Standard Time,  
jltran at att.net writes:

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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