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

WarrenS warrensjmail-one at yahoo.com
Thu Dec 22 15:11:55 EST 2011

IF? the RS232 command changes the freq and does not reset the phase,
then the way to get there is to use dither or PWM between two frequency 
Example: to change the phase 1ps, change the freq by 7e-13 for 1.4 seconds 
and then put it back.
If you want finer resolution than 1 ps then update faster.


>Using the digital input will only give you 7 E-13 steps. I will use it for 
>Bert Kehren

 albertson.chris at gmail.com writes:

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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