Hi, On 08/29/2015 11:24 AM, Neville Michie wrote:
A PLL locks on to the nearest cycle, is a Time Locked Loop different?
Yes and now. In a signal conveying time, rather than letting a rising edge denote "0 degrees of phase" you have some even time measure occuring, of some known nominal rate. You know what "time" it was on the time-scale, so that you know how much your local replica time-scale is off when compared. This time difference does go beyond the nearest cycle, but typically for locked situations is the nearest cycle.
Don't ask how I know, I just know.
If the decoded time from a GPS system is used discipline an oscillator then leap seconds would have to have a frequency transient to maintain lock.
No, as GPS time in itself does not have leap-seconds, it's nominally the TAI time-scale offset. GPS signal conveys the difference between GPS time and UTC, and thuse the UTC can be conveyed.
If you use the output to say drive a radio telescope monitoring a distant object you would want Earth’s rotation to be phase or sidereal Time locked. I realise that for such a task far more complex computation would be required. So is a time locked loop a valid concept?
Yes, whenever the enumeration of cycles to some time-scale is relevant. Cheers, Magnus _______________________________________________ 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.
