[ntp:questions] Tighter regulation?

Mischanko, Edward T Edward.Mischanko at arcelormittal.com
Sun May 26 20:21:02 UTC 2013


> -----Original Message-----
> From: questions-bounces+edward.mischanko=arcelormittal.com at lists.ntp.org
> [mailto:questions-
> bounces+edward.mischanko=arcelormittal.com at lists.ntp.org] On Behalf Of
> David Woolley
> Sent: Sunday, May 26, 2013 3:52 AM
> To: questions at lists.ntp.org
> Subject: Re: [ntp:questions] Tighter regulation?
> 
> Mischanko, Edward T wrote:
> 
> >
> > I tried reducing the Allan Intercept to 7 and the result was wild swings
> in
> >  frequency ppm.  I don't know why?  Is the FLL broken?  Has anyone else
> >  observed this behavior?
> 
[Mischanko, Edward T] 

To be more specific, I get wild adjustments in frequency when polling at or
 above the allan intercept setting with current FLL gain settings.  Again,
 I don't know why?  I don't understand how the frequency locked loop works
 verses the phase locked loop -- the differences?

> If you are not suffering from wild swings in frequency, you should not
> be trying to reduce the measured offsets.  There are basically two
> causes of high offsets, errors in you own frequency and errors in
> measurement of the time.  The latter you should be trying to get ntpd to
> ignore, and only take the long term average of the time measurement.
> 
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