Using this flow graph: http://i.imgur.com/K9TaN.png

I get this traceback:
-- Opening USRP-E on /dev/usrp_e0
Traceback (most recent call last):
  File "full_duplex.py", line 60, in <module>
    tb = full_duplex()
  File "full_duplex.py", line 31, in __init__
    num_channels=1,
  File "/usr/lib/python2.6/site-packages/gnuradio/uhd/__init__.py", line 74,
in constructor_interceptor
    return old_constructor(*args, **kwargs)
  File "/usr/lib/python2.6/site-packages/gnuradio/uhd/uhd_swig.py", line
2045, in usrp_sink
    return _uhd_swig.usrp_sink(*args, **kwargs)
RuntimeError: EnvironmentError: IOError: Failed to open /dev/usrp_e0

This never occurs when using only one source or sink, but occurs with two,
independent of the antennas I specify.

On Thu, Aug 4, 2011 at 13:57, Meyer S. Jacobs <meyerma...@gmail.com> wrote:

> Using gnuradio-companion for code generation, with the UHD drivers for
> the E100, it still locks up. I can provide my .grc files and generated
> python code when I get back to my desk.
>
> -Meyer S. Jacobs
>
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