Or use 1ns per foot of antenna cable. That will get you closer. Sent from mobile
> On Dec 8, 2014, at 8:16 AM, David J Taylor <[email protected]> > wrote: > > Hi > > On *most* GPSDO’s, the simple answer is “there is a cable delay adjustment to > align it”. Without some sort of reliable representation of UTC (at the ns > level) it’s tough to measure. If you happen to live at USNO or NIST, you can > access that sort of timing. For the rest of us - not so easy. The NIST two > way GPS “modem” setup is about the only practical method that I know of. > > The PPS out of any GPSDO will be much lower jitter than the pps from a normal > GPS module. > > Bob > ====================================== > > Bob, > > Thanks for your comments. The antenna location and cable lengths are very > similar (either 0, 5m or 10m) so I was expecting somewhat less than 50 ns > difference. 200+ ns is rather more than I expected for the LTE-Lite, so I > did wonder whether anyone else had measured it. > > Although I've not checked it rigorously, most of the GPS/PPS units here of > various brands are within under 100 ns of each other, hence my expectation. > > Cheers, > David > -- > SatSignal Software - Quality software written to your requirements > Web: http://www.satsignal.eu > Email: [email protected] > _______________________________________________ > 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.
