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.grc
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--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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