Hello Steve, that sounds like an interesting project; a couple of friends and I went to the US for GRCON'14, rented a car and somehow Sirius and XM spiked our interest, but as you can imagine, it's kind of hard to receive those in Europe.
Could you share a bit of your flowgraph with the community? What synchronizer blocks are you using? Not having played around with them overly much, I've heard people having great success using the PFB clock recovery, as that seems to be pretty robust against amplitude variation, so that'd be my "Hm, I guess you could try that" idea. Cheers, Marcus On 08.04.2016 01:30, Steve Katzberg 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 <mailto:ja...@gardettoengineering.com> > *To:* GNURadio Mailing List <mailto:discuss-gnuradio@gnu.org> > *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 > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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