[time-nuts] WWVB test: some results

John Seamons jks at jks.com
Sun Apr 15 23:38:21 UTC 2012


It appears that, like last month's test, the phase data pattern transmitted is constant and repeats every minute. The pattern is different than last time however:

+-- sec 0
v
vvvv April 15 2012
1001100101 0100000011 1110111100 1110101100 0010111000 1101101000 <-- sec 59
1011011110 0000100111 1001100111 1111010010 0100101111 1111111110
^^^^ March 11 2012

vvvv April 15 2012
sync=01001100101010 tpar=00000 hour=11110111101110101100 min=010111
sync=01011011110000 tpar=01001 hour=11001100111111010010 min=100101
^^^^ March 11 2012

vvvv April 15 2012
dston=0 leap=0 dlpar=110 dst=110100 r=1000
dston=1 leap=1 dlpar=111 dst=111111 r=1101
^^^^ March 11 2012

I'm pretty sure I have the phase ambiguity correct since the two sync bits between minute frames (at secs 0 and 59) have the same value across both tests.

But the other bits and fields don't make any sense with respect to the NIST spec: The minute field doesn't increment, the dston/leap parity bits aren't correct, etc.
So my guess is that they're only testing the autocorrelation properties of different sync patterns rather than the full protocol. But who knows..





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