[time-nuts] FE-5680A arrived

Chris Albertson albertson.chris at gmail.com
Thu Jan 12 23:08:39 EST 2012


On Thu, Jan 12, 2012 at 6:09 PM,  <EWKehren at aol.com> wrote:
> How are you going to measure and adjust and to what level. What error can
> you live with?

What error?  I'd say one DDS step.  The steps are in units of about
5.6E-13 so the max error is 1/2 of that.

How long to measure.  The PPS will be random  the worst case will be
that it is 30 seconds off.   That could take a LONG time.   I think it
is best simply to measure the PPS offset from UTC and leave it.  Just
get the 10MHz right and the PPS will keep a constant known offset.
Any timing application will have a way to enter the offset.

If you really do want to move the phase of the  PPS.  I think a fast
way might be to turn the FE5680 off then back on, repute until you get
"close".

-- 

Chris Albertson
Redondo Beach, California




More information about the time-nuts mailing list