Matthias Welwarsky said: > Only frequencies that are even multiples of the internal crystal frequency > (48MHz) are "clean". Everything else is, as Bob puts it, "drop a pulse, add a > pulse" approximations. However, that's normally easy to filter.
How clean? It's a GPS, not a GPSDO, so I'd expect the 48 MHz is free running rather than locked to GPS time. Take the PPS case. There will be adds/drops going on to correct for the frequency error in the 48 MHz crystal. The pattern will change as the frequency changes with temperature or whatever. That's how you get hanging bridges. :) Assume it is off by roughly 1 PPM. That's well within specs for a crystal. I just want a number for the back of an envelope. For 10KHz, 1 PPM is an add/drop every 100 cycles. I'll bet you can catch that on a scope running in persistance mode. -- These are my opinions. I hate spam. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe send an email to time-nuts-le...@lists.febo.com
