I think there is an overlay modulation. I'll try dig up the source where I saw that. On Apr 7, 2016 16:30, "Steve Katzberg" <[email protected]> wrote:
> Jason, > > I am involved in a project that needs the bit stream from XM but we do not > need it decrypted. The acquisition of the unencrypted Channel 1 would be > fun to do, but so far I cannot get Gnuradio blocks to properly lock on to > the signal. The Costas loop drifts through he QPSK constellation, but > won't stay locked on it. That probably means I don't have something right > in GRC or there is an overlay modulation that confuses the Costas loop > phase locking. Until either my hybrid hardware/GRC setup starts locking > onto the XM signal there will be no Channel 1. > > Steve Katzberg > > ----- Original Message ----- > *From:* Jason Matusiak <[email protected]> > *To:* GNURadio Mailing List <[email protected]> > *Sent:* Thursday, April 07, 2016 5:14 PM > *Subject:* [Discuss-gnuradio] XM on GR > > I was thinking about XM radio today and how channel 1 on it is sent in the > clear (if you don't have a subscription, you can tune to it and hear their > adds). I haven't found a lot of information (so I think I know the > answer), but has anyone looked into an XM receiver in GR? > > ------------------------------ > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > >
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