On Sun, Jul 10, 2016 at 8:55 PM, John Swenson <johnswens...@comcast.net> wrote:
> I'm thinking about converting a Nixie clock I built years ago into using > GPS for the time base. No real NEED, just for fun. > > > Which is better to use, the 1PPS or the 10KHz? I can easily go either way. > The clock display just goes down to seconds so 1PPS would work. I could > also re-clock the 1PPS with the 10KHz. You have to use the 1PPS. It is in phase with the UTC second. Your seconds display increments with every PPS pulse. If you were to use 10KHz, how would you know which of those 10,000 pulses was the UTC second "tick" The way it works with GPS is you first de-code the message from the serial port and hold that data in some internal memory then wait for the PPS pulse. When the pulse happens you move the internal memory data to the display. I don't know what you'd do with 10KHz except divide it by 10,000 to create your own 1PPS but how to get it to "tick" on the exact UTC second? If you were displaying tenths of seconds then you'd need the 10K output (divided by 1,000) to drive a counter that gets reset to zero by the PPS. -- Chris Albertson Redondo Beach, California _______________________________________________ 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.