Why not put a GPS receiver in it ? It won't always get a lock, but if it gets accurate time every few weeks it can do the long-term tweaking someone suggested in the watch thread (call in to the watch repair two weeks apart). Except it can be done more or less EVERY two weeks.
I agree, a phone app is also a way to implement the time code generator. But there's a lot to be said for a self-contained box for some jobs, and the hassle of linking it to a phone or PC can be avoided for $10 on the BOM. It doesn't even need to be a 'good' one - the TCXO is going to keep it accurate enough over the months you can spend tracking the error. On Thu, Apr 12, 2018 at 11:21 PM, Chris Caudle <[email protected]> wrote: > 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 -- [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.
