Yes, do not use tiny offsets, go to 1us: I use microseconds offsets to take PPSes measurements .
On Thu, Nov 21, 2013 at 1:34 PM, Bob Camp <li...@rtty.us> wrote: > Hi > > The counter and offset generator both should be quite accurate at a 1 us > offset. That’s large enough that you are outside the range of most GPS jumps. > If you are going to move things around, you might as well move out to that > vicinity. > > Bob > > On Nov 21, 2013, at 6:20 AM, Tom Van Baak <t...@leapsecond.com> wrote: > >>> Below is a plot so you could see exactly what I measured. What is peculiar >>> is that the time jumps by exactly 100ns to 200ns. Almost as if the GPS >>> receiver decides to offset the time by twice the amount I set it to. Which >>> is why I initially thought it might be a firmware thing. I suppose >>> multipath is a good explanation, it is just odd that the time error is >>> exactly 100ns. >> >> Hi Stephan, >> >> A quick test you could perform is set the offset to 125 ns instead of 100 ns >> and see if the jumps still occur, still occur at 100 ns, or now occur at 125 >> ns. >> >> Since you have three M12's offset the third one by 150 ns and see if it >> experiences jumps too. >> >> Question -- are you using the external 10 MHz reference input or output for >> any of your 53131A counters? >> >> /tvb >> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
