Hi To be clear - the idea of going to a non-100 ns multiple is a good one. You probably should avoid multiples of 1/10.24 MHz as well.
Bob On Nov 21, 2013, at 8:00 AM, Azelio Boriani <[email protected]> wrote: > 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 <[email protected]> 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 <[email protected]> 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 -- [email protected] >>> To unsubscribe, go to >>> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >>> and follow the instructions there. >> >> _______________________________________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
