Hi Mark, Have you done any measurements on the 1PPS to see of their 10ns jitter figure is correct? I was doing some comparisons here against my UT+, but I don't have GPIB hooked up yet, so I can't get anything more than a general feel. If you do any accurate measurements, could you please post them? Eventually I hope to set things up so I can compare the jitter between the two with the sawtooth figure the UT+ outputs.
Bob >________________________________ > From: Mark Sims <hol...@hotmail.com> >To: "time-nuts@febo.com" <time-nuts@febo.com> >Sent: Saturday, September 7, 2013 9:15 PM >Subject: [time-nuts] NTP/1-PPS/RS232 question > > >I got in those Adafruit GPS boards. They are a very nice little GPS. VERY >sensitive. I could get good lock indoors on my (windowless) kitchen floor. >The house is 2 story, stucco with wire mesh in the stucco. I could also get >lock in a restaurant that had a tin roof. We were far from any windows. >The 1PPS signal is normally low and pulses high for 100 milliseconds. The >RS-232 adapter board that I built feeds this into an RS-232 transmitter chip >(MAX3232), so on the interface connector CD will be at +V and pulse down to >-V. Is this what stock NTP likes? >Also, I laid out the adapter board so it an accommodate a Trimble Resolution >T or a Crius CN06 receiver. The Crius receiver uses a U-Blox NEO-6M receiver. > They can be had for around $22 at HobbyKing. They seem to perform even >better than the AdaFruit module. It looks like you will need to bodge a wire >onto the TIMEPULSE pin to use it for 1PPS. >_______________________________________________ >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.
