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 -----
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?
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