[time-nuts] WWVB phase modulation format?
Peter Monta
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.
Cheers,
Peter
-------------- next part --------------
A non-text attachment was scrubbed...
Name: wwvb-phase.png
Type: image/png
Size: 4805 bytes
Desc: not available
URL: <http://febo.com/pipermail/time-nuts_lists.febo.com/attachments/20120311/6bd1f027/attachment.png>
More information about the Time-nuts_lists.febo.com
mailing list