Sorry, I meant "even if the recipient is in the EU". Interesting the proposed use of the LEA-6T time stamping...
On Mon, Mar 26, 2012 at 11:10 PM, Dennis Ferguson < [email protected]> wrote: > > On 26 Mar, 2012, at 12:56 , Chris Albertson wrote: > > On Mon, Mar 26, 2012 at 12:50 PM, Attila Kinali <[email protected]> > wrote: > >> Moin, > >> > >> I have the numbers together for the group buy of the u-Blox LEA-6T. > > > > I have not been able to locate a spec sheet for there. Do you have a > > link? Or maybe you could say how these are improved over the M12M? > > Apart from other issues it may potentially provide significantly > more accurate time for computer timekeeping via the Time Mark input, > depending on the accuracy of measurements on that input. > > That is, rather than connecting the PPS output to a computer input pin > and then trying to timestamp when the interrupts occur, one can instead > tie an output pin from the computer to the Time Mark input and poll > for timestamps measured by the LEA-6T, say with a programmed sequence like > > <get computer clock timestamp> > <toggle Time Mark pin> > <get computer clock timestamp> > . . . > <ask LEA-6T for Time Mark timestamp> > > If done well that may get the time ambiguity at the computer end down from > the > microsecond level of interrupt latency to the < 100 nanoseconds it > should take for a PIO write to a hardware register to complete. If the > LEA-6T takes Time Mark timestamps with that precision then this may be a > significant improvement. > > Dennis Ferguson > > _______________________________________________ > 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.
