On Tue, April 10, 2018 8:12 pm, Bob kb8tq wrote: > Since your typical PC does not have anything in it that is accurate to 0.1 > ppm, you still need something as a reference to compare things to. > A GPS module or a GPSDO are probably the easiest things to get ahold of.
Catching up on some of the time-nuts traffic, some of the messages about GPS API on phones make me wonder if a phone would not be a better option for a typical non-time-nut user than a PC. Setting up a GPS receiver with PPS output with a modern PC that does not have a RS232 port available can be pretty tricky (you would probably be starting with a bare circuit board rather than a nicely packaged GPS device for starters), so maybe a phone with GPS built in that lets you grab raw time data would be a better setup for a user with limited experience setting up time measurement systems. Or maybe a GPS Arduino shield and build a calibration system from a second Arduino. Multiple possibilities that are hard to rule out until the hard performance limits are defined. -- Chris Caudle _______________________________________________ time-nuts mailing list -- firstname.lastname@example.org To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.