> If you don't have a scope or TIC to get the Rbs PPS offset from GPS, you > can let NTP do it for you.
You don't even need NTP. The linux PPS driver tags every pulse with a nanosecond time tag. (But on almost all computers the time stamp will have uSec resolution and the lower order digits will be some fixed random value.) Run the program "ppstest" to write these tags human readable form. So if you have PC hardware with a serial port, you have a TIC, interfaced to a computer logger good to about 1 or 2 uS with as many input channles as you have serial or parallel ports. Some people are using this to measure 60Hz mains power frequency. Simply connect AC (using some safe method) to pin one of a serial port and every cycle gets time stamped. The system is fast enough to log 1000 per second easy. Chris Albertson Redondo Beach, California _______________________________________________ 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.
