[Discuss-gnuradio] RX channel 1 out of range for configured RX frontends

[Daniel Marlow]

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


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/~marlow/gnuradio/TVRX2.grc