Hi > On Dec 19, 2016, at 9:30 PM, Charles Steinmetz <[email protected]> wrote: > > David wrote: > >> This does appear now to be working - see below. I'm not exactly sure what >> was the secret to getting this to work, but the above procedure seemed ok. > > Time. It is not at all unusual for a 58503A that has no almanac (or an > out-of-date almanac) to take several days to achieve disciplined operation > (and much longer for the OCXO to fully stabilize). You may get lucky and > find that it happens faster, but don't count on it. FWIW, HP GPSDOs often > take longer than others to initialize. > > Everyone, please remember -- GPSDOs can take significant time to > re-initialize. No need to post about what may be wrong until at least 3 days > of continuous running after powering on. Chill. > > Same with respect to crystal oscillators settling to low drift rates. No need > to worry about drift (retrace) for at least a month (sometimes 6 or even 12 > or 24 months) of continuous running after powering on. > > Honestly, the best thing to do is turn it on and forget about it for 3 days > (GPSDO) or 1 month (crystal oscillator). DO NOT observe it (log it, if you > feel the need, and don't look at the log until after the 3/30 days).
….. and that’s several days with constant access to satellites (> 6 sats at all times). If your antenna location is “challenged” you can multiply the time required by some factor like 3 or 5 or … This is why some of us spend a lot of time talking about the importance of antenna location on these boxes. Bob > > Precise time and frequency require patience! > > Best regards, > > Charles > > > _______________________________________________ > 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.
