As soon as I have finished the aging test, I will use a Shera controller,  
controlling the C field and the 1 pps output of the Tbolt. Having controlled 
all  my Rb's with GPS/Shera with good results I will continue in that 
directions,  unless some one can direct me in a direction with a better 
The next  challenge will be taking the output of the 5680 and improve its 
short term  performance with a high performance OCXO. I have some 10811 
candidate but I am  intrigued by the Morion MV 89 that you can see in the 
background of yesterdays  picture, it is a unit I bought for $ 30. 
Not counting the cost of the Tbolt that most already have, for less than $  
200 one will be able to duplicate using the proper time constants the HP 
5065  spec, not the performance some selected ones display.
It will spread superior time and frequency capability to a larger group of  
time nuts.
Bert Kehren
In a message dated 12/22/2011 12:48:47 P.M. Eastern Standard Time, writes:

You need  a recording phase detector to tell if the 5680A is properly  
I'm sure all of us have a Racal 1992 or similar with a GPIB or  other 
computer interface.

Below: phase plot of FE-5680A vs  Thunderbolt FW=3.0 in seconds (about 
1/2 day).
Frequency offset was set  to -1280 with my software (available at
I have noticed a  bump in the phase plot corresponding to an wobble in 
The  Force
according to Heather.  Think of herding cats made of  granite.  It looks 
like observations
must be made over days or  weeks.

On 12/22/2011 09:20 AM, Chris Albertson wrote:
> On  Thu, Dec 22, 2011 at 8:50 AM, Frederick  Bray<>  
>> Has anyone  successfully used a Thunderbolt to discipline a  FE-5680A?
>> I thought I saw a posting or site where  someone disabled the 10 MHz
>> oscillator on the Thunderbolt and used  the Thunderbolt to discipline the
>> FE-5680A.  However, I can't  find it now.
> I would not do it that way.  My plan is to leave the  t-bolt as is and
> then every 24 or so hours adjust the  FE-5680A  if required to better
> match the t-bolt.  My hope is that after  some time the    FE-5680A
> will less and less frequent  adjustments.  This will be a while as my
> FE-5680A is still in the  mail.
> I think the FE-5680A has to course of adjustment to be  used in the
> "fast" control loop inside the  t-bolt
> Chris Albertson
> Redondo Beach,  California
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Chuck Forsberg WA7KGX N2469R
Developer of Industrial  ZMODEM(Tm) for Embedded Applications
Omen Technology Inc   "The High Reliability Software"
10255 NW Old Cornelius Pass  Portland OR 97231    503-614-0430

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