You need a recording phase detector to tell if the 5680A is properly tweeked. 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<>  wrote:
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

<<attachment: m1280.gif>>

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