On Mar 9, 2012, at 4:28 PM, Peter Monta wrote: > Interesting that WWVB is running a phase-modulation test---thanks for > the links. Is the signal format known? A quick search shows nothing > specific, just "we're testing". > > Could someone record a few minutes of the broadband signal so that > those of us without ready-to-hand LF receivers can have a look? > > Cheers, > Peter
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. Apologies for the crude measurement and presentation. I had to throw this together in a hurry. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
