On Tue, June 9, 2015 11:30 pm, Ed Armstrong wrote: > OK, here is the actual question. Do you think it is OK to consider a > pulse which arise 250 ns early to be close enough?
It is only 250ns early relative to the even second output. What is the even second output referenced to? What most people care about is relation to established UTC, and that you don't know for either pulse. You did not mention measuring the length of the antenna cable and adjusting for that. That will probably be a few tens of nanoseconds. There could be other processing delays or propagation delays in the signal path. Without accounting for all of those, and knowing whether the firmware in the GPSDO takes those into account, you don't really know whether the PPS is early, or the PP2S is late relative to UTC (and assuming you have accounted for antenna delay). -- Chris Caudle _______________________________________________ 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.