[time-nuts] Using Thunderbolt to Discipline FE 5680A?

Chuck Forsberg WA7KGX N2469R caf at omen.com
Thu Dec 22 15:13:55 EST 2011

Phase is the integral of frequency.  That is why matching phase is
much more sensitive, as you can integrate for a long time.

Unlike the fine adjust on the Racal 1992, adjusting the frequency offset
on the 5680A is immediate and without a long time constant.

You can set the initial phase to whatever you like by setting a large 
freq offset
and watch the phase change.  Reset it when the phase gets to what you want.

On 12/22/2011 11:49 AM, Chris Albertson wrote:
> On Thu, Dec 22, 2011 at 9:52 AM, Chuck Forsberg WA7KGX N2469R
> <caf at omen.com>  wrote:
>> You could disable the Tbolt's oscillator and put the Rb output in its place.
>> Then write a program that reads the PPS and/or OSC offset and issue
>> appropriate commands to the Rb to bring it in line.
> I don't think it is possible to do that.  The RS232 commands don't
> allow the level of control that is required.  All you can do is step
> the frequency, no way to adjust the phase of the Rb 10MHz output.
> 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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