On Nov 3, 2014, at 5:59 PM, Marcus D. Leech wrote:
> 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.... :) > Hi Marcus, Thanks. Does that mean we need a new install of GR? The one we have is quite recent. Regarding the TVRX2, I did not know about the AGC issue. We are using it for RA (pulsar searches). Since we are doing synchronous detection, it's not clear to me that the AGC will be a fundamental problem, since we don't need quantitative power measurements. We wanted two channels since we are using crossed Yagi's. I don't see any alternatives from Ettus. --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 >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> [email protected] >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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