James said: > I haven't tested it yet, as I'm attempting to 'improve' my PPS over USB > setup.
Do you know what you are getting into? 1/2 ;) It's either fun if you are in the right mood, or a pain in the butt if you are unlucky. Do you know about hanging bridges? http://www.leapsecond.com/pages/m12/sawtooth.htm You can get the same thing with the USB clock beating against the PPS clock. The USB clock is derived from the CPU clock. That varies with temperature. I have one setup that gets a good hang on a cold winter night. If your clocks aren't close to in-sync, then ntpd will average over several/many samples with a random offseet. That's the common case. Your clock will be 1/2 ms off if you are using real slow USB and 1/2 of 125 microseconds if it's using the faster USB. I forget what USB calls them. Most GPS USB gizmos are slow and don't have PPS. If the clocks get very very close to in-sync, then the offset isn't random. If the clocks are close enough to in-sync, then all the samples will be close to the same offset. Putting ntpd on top of that adds another layer of complexity. -- These are my opinions. I hate spam. _______________________________________________ devel mailing list [email protected] https://lists.ntpsec.org/mailman/listinfo/devel
