[time-nuts] Using Thunderbolt to Discipline FE 5680A?
EWKehren at aol.com
EWKehren at aol.com
Thu Dec 22 13:46:38 EST 2011
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 solution.
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
In a message dated 12/22/2011 12:48:47 P.M. Eastern Standard Time,
caf at omen.com 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
Below: phase plot of FE-5680A vs Thunderbolt FW=3.0 in seconds (about
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
according to Heather. Think of herding cats made of granite. It looks
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<fwbray at mminternet.com>
>> 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 caf at omen.com www.omen.com
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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