Dave, How do I adjust the loop time constant so that it is shorter??
>> The integral component should be retained. The effect of having too >> long a loop time constant should be that the system fails to track clock >> wander, so would be more vulnerable to temperature changes or forgetting >> to disable power management of clock frequency. -----Original Message----- On Behalf Of David Woolley Sent: Monday, May 16, 2011 2:01 AM To: questions@lists.ntp.org Subject: Re: [ntp:questions] Loop Filter Gains vs. Polling Interval Mischanko, Edward T wrote: > Can anyone tell me, does the sensitivity for frequency adjustment lessen > as the polling interval increases? I ask because I'm observing that my They are linked, but I have a feeling that the loop time constant is not clamped, even though the poll interval is. The aim is to always achieve a certain level of oversampling. At the very least, the intent is to vary the time constant and then choose a poll interval that is appropriate for that. > offset increases and the frequency adjustment decreases to the point I > fall out of sync at polling intervals above 256. What am I doing wrong? The integral component should be retained. The effect of having too long a loop time constant should be that the system fails to track clock wander, so would be more vulnerable to temperature changes or forgetting to disable power management of clock frequency. _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions _______________________________________________ questions mailing list questions@lists.ntp.org http://lists.ntp.org/listinfo/questions
