> You need to come up with the ramp/parabolic which will compensate your > oscillators linear frequency error and frequency drift and the only way to do > that properly is to compare it to something which is better. So, you need to > compare against a Cesium or GPS, and then calculate the parameters, and then
Even if you compare to something better you seem to imply that a given quartz oscillator has "parameters" as if they were some fixed immutable value valid for all times and scaleable up or down for any tau. This is not the case. Drift rate specifications can be made per day or month or year. These are not specs of how the oscillator must perform or will perform; they are often guaranteed limits on how bad the oscillator will perform. You can measure the actual daily drift rate by taking a month of data and dividing by 30. But if you do this my guess is you will be amazed how much the daily drift rate varies from day to day, or hour to hour. > redo this. In order to handle other perturbations such as random phase jumps > and result of mechanical chock, you need to do this on a regular basis. > What you now have is a control-loop of some sort, wherein a PLL is really just > one perticular class. E.g., GPSDO. /tvb _______________________________________________ time-nuts mailing list [email protected] https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
