[time-nuts] NIST's WWVB phase modulation format paper from PTTI 2011

Jim Hickstein jxh at jxh.com
Fri Mar 16 01:02:37 UTC 2012


 > If I'm right, that's another broken egg in the frequency reference 
basket.

I read the paper, but I could use an expert ruling from the list:

What does this actually mean for my Spectracom 8170 and Spectracom 8164, 
i.e. the twins?  The latter I frankly don't use much (I'm early in the 
time-nuts disease progression), but the 8170 I want to continue to rely 
on, at least to set itself.  A little phase noise I can tolerate.  But 
the recent transmission-format experiments coincided (to a first 
approximation) with the recent coronal mass ejection that knocked the 
8170 on its ass for most of a week, so my observations are not conclusive.

The circuit (still a-building) to set my SWCC clock will take the 1PPS 
edge, but the speed of the solenoid, not to mention the time constant of 
the current-loop, I'm sure vastly outweighs this new source of error. 
Right?  Will the strip-chart recorder on the 8164 provide a new source 
of amusement, as it tries to plot the 180-degree phase changes every second?



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