B210 two-channel operation

Hello,

OS: Ubuntu 14.01.1
gnu-radio: 3.7.6
Dell Optiplex 765

I am having trouble using the B210 USRP in two channel mode.
Things work well when I use grc to configure the B210 with one channel,
but when I try using two channels, I get the error shown below. This
is quite similar to a problem I had earlier with a TVRX2, which was
fixed with a “-M build.” I am still using the same build and the
TVRX2 continues to work fine. Perhaps I am not configuring the B210
properly? I attach the .grc and top_block.py files.

Any suggestions would be most welcome.

Sincerely,
Dan Marlow

Executing: “/home/marlow/gnuradio/B210/top_block.py”

linux; GNU C++ version 4.8.2; Boost_105400; UHD_003.008.000-50-gb228b755

Using Volk machine: ssse3_64_orc
libGL error: failed to load driver: swrast
– Operating over USB 2.
– Initialize CODEC control…
– Initialize Radio control…
– Performing register loopback test… pass
– Performing register loopback test… pass
– Performing CODEC loopback test… pass
– Performing CODEC loopback test… pass
– Asking for clock rate 32.000000 MHz…
– Actually got clock rate 32.000000 MHz.
– Performing timer loopback test… pass
– Performing timer loopback test… pass
– Setting master clock rate selection to ‘automatic’.
Traceback (most recent call last):
File “/home/marlow/gnuradio/B210/top_block.py”, line 178, in
tb = top_block()
File “/home/marlow/gnuradio/B210/top_block.py”, line 99, in init
self.uhd_usrp_source_0.set_samp_rate(samp_rate)
File
“/usr/local/lib/python2.7/dist-packages/gnuradio/uhd/uhd_swig.py”, line
2774, in set_samp_rate
return _uhd_swig.usrp_source_sptr_set_samp_rate(self, *args,
**kwargs)
RuntimeError: LookupError: IndexError: multi_usrp: RX channel 1 out of
range for configured RX frontends

On 01/27/2015 02:29 PM, Daniel M. wrote:

TVRX2, which was fixed with a “-M build.” I am still using the same

libGL error: failed to load driver: swrast
– Performing timer loopback test… pass
RuntimeError: LookupError: IndexError: multi_usrp: RX channel 1 out of
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