[time-nuts] WWVB phase modulation format?
pmonta at gmail.com
Mon Mar 12 03:57:16 UTC 2012
> I believe what they were doing is applying a simple 180 deg phase shift to the carrier (BPSK) during certain one second timecode intervals.
I suppose this will help coherent receivers somewhat, but I was
expecting something DCF77-like. A pity.
Thanks for posting your data. You certainly have good WWVB reception.
Attached is a plot of the real part of the demodulated signal after
carrier estimation. They change the phase 100 ms after the second
marker, halfway between the second marker and a potential change in
amplitude back to full power. So the phase transition always occurs
in the middle of a low-power interval.
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