On 11/03/2014 05:55 PM, Daniel Marlow wrote:
Hello,
We are using a TVRX2 board with a N200 USRP. Until recently,
the system was working properly with two channels using the attached
flowgraph. For reasons that are unclear, it stopped working and is
no longer capable of two channel operation (if we set the Num channels
parameter to 1, the system works, but with only one channel). So
far as we can
tell, nothing in the S/W changed.
Version details and the error message appears below. Suggestions
what has gone wrong would be most appreciated.
--Dan
There's a fix for this problem in the most recent "master" of GR, which
doesn't appear in the "maint" branch.
It was a wee problem in gr-uhd that was introduced by wanting to be more
"strict" about master-clock LOCK, and, well, that provoked
other underlying problems.
What are you using the TVRX2 for, BTW. I'll note that it has
cannot-be-defeated hardware AGC, so it's of only limited utility for
radio astronomy, which I think you're probably using it for.... :)
H/W: Dell Optiplex Dual 2.4 GHz, 2 GB / USRP N200 with TVRX2 GPSDO
boards.
OS: Ubuntu 14
gnuradio: 3.7.6
Traceback (most recent call last):
File "/home/marlow/gnuradio/TVRX2/top_block.py", line 177, in <module>
tb = top_block()
File "/home/marlow/gnuradio/TVRX2/top_block.py", line 94, in __init__
channels=range(2),
File
"/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/__init__.py",
line 122, in constructor_interceptor
return old_constructor(*args)
File
"/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py",
line 1753, in make
return _uhd_swig.usrp_source_make(*args)
RuntimeError: LookupError: IndexError: multi_usrp: RX channel 1 out of
range for configured RX frontends
http://www.hep.princeton.edu/~marlow/gnuradio/TVRX2.png
<http://www.hep.princeton.edu/%7Emarlow/gnuradio/TVRX2.png>
http://www.hep.princeton.edu/~marlow/gnuradio/TVRX2.grc
<http://www.hep.princeton.edu/%7Emarlow/gnuradio/TVRX2.grc>
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--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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