On Mar 11, 2012, at 12:53 PM, John Seamons wrote:

> I took a look at this. Pictures and video here: http://jks.com
> I believe what they were doing is applying a simple 180 deg phase shift to 
> the carrier (BPSK) during certain one second timecode intervals.
> Whether there was anything fancier going on or not (like what DCF77 does) I 
> couldn't tell immediately, although I did make a 192 ksps sound card 
> recording for future analysis.

Okay, so I did a little analysis of the data. See the website for details. For 
the few minutes I recorded there was a fixed pattern of phase changes that 
repeated each minute. They did not seem related to the changing timecode. I 
tried interpreting the bits as various things, including ascii characters, but 
no luck. Maybe one of you will figure it out, or I suppose we could ask.

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