[GPS_Standard] GPSstd_PLL - today's plot of SM1/SM2 at about 53 hours in

[Bob Stewart]

Chris,

Now that I look at the actual data, you have found a bug.  I went into holdover for 2 seconds at 23:03 on the 13th, and when it came out, it issued the change upward that looks out of place on the plot.  I need to stop updating the states while it's in holdover.  In fact, I may need to reset the state to zero.  Thanks!  

Bob





>________________________________
> From: Chris Howard w0ep <w0ep at w0ep.us>
>To: Bob Stewart <bob at evoria.net> 
>Sent: Thursday, November 14, 2013 2:05 PM
>Subject: Re: [GPS_Standard] GPSstd_PLL - today's plot of SM1/SM2 at about 53 hours in
> 
>
>
>Can you explain a bit more about what we are looking at?
>
>I think I understand DAC value (control voltage) being the top plot.
>What is the bottom plot?  Why does it go from -10 to 10?
>
>What do you think about the rapid excursions in the bottom plot
>appear to be all slanting downward?  I'm talking about
>near 00:00 11/13  06:00 11/13 and 00:00 11/14.
>The DAC doesn't seem to do that.  Any idea on that?
>
>
>Chris
>
>
>On 11/14/2013 1:10 PM, Bob Stewart wrote:
>> I left it running, as promised, and here is the link.  It seems to have settled down to an interesting pattern over the past 12 hours with no net phase crossings.  However, as there is nothing in the software to account for oscillator aging, this will eventually change and reach some new temporary equilibrium.
>> 
>> In looking at the plot, though, I only see 8 phase crossings once it reached stability at about 11:00 AM no November 12.  All things considered, that's quite good.  I've got a number of new ideas that I'd like to try, but I think I'll let this continue to run for awhile.  The temperature variation near the GPSDO over the past 24 hours has been between 73 and 79 degrees F.
>> 
>> http://www.evoria.net/AE6RV/GPSstd_PLL/Plots/SM1SM2.53hrs.png
>> 
>> Bob - AE6RV
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