les...@veenstras.com said:
> Software 60Hz PLL
Yup. It probably needs an AGC too.
Anybody got code I can start with?
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2012 13:37
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] 60Hz extra PPS: got one
b...@iaxs.net said:
> Hal, do you have a resonant 60 Hz filter in the pickoff?
Not by intent. It's just a wall-wart transformer and then some resistors to
get the rig
azelio.bori...@screen.it said:
> What do you mean with "it finds noise"? When the PLL can no longer track the
> sinewave?
I was thinking of a PLL to track the input and then a simple compare of raw
input vs filtered output. If they don't match closely the difference is the
noise that the PLL
b...@iaxs.net said:
> Hal, do you have a resonant 60 Hz filter in the pickoff?
Not by intent. It's just a wall-wart transformer and then some resistors to
get the right level. There are the standard cables (wall wart, RS-232,
audio, clip leads). I'm sure there are resonances in there but not
Hal, do you have a resonant 60 Hz filter in the pickoff? The waveform
in Aug-09-a1 certainly had multiple zero crossings.
Remote-controlled tap changers can do things like that.
If I got the UTC offset right, that happened at about 2 PM local time,
when a big transformer tap could have been chang
What do you mean with "it finds noise"? When the PLL can no longer track
the sinewave? I think that a simulator with such a behaviour must be
written specifically for that capability.
On Fri, Aug 10, 2012 at 10:51 AM, Hal Murray wrote:
> Actually, there were 2 extra pulses.
>
> Here is the PPS vi
Actually, there were 2 extra pulses.
Here is the PPS view:
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a-pick.png
(Samples every 10 seconds.)
Here is the audio view:
http://www.megapathdsl.net/~hmurray/time-nuts/line/2012-Aug-09-a0.png
http://www.megapathdsl.net/~hmurray/
