On 11/03/2014 06:15 PM, Daniel Marlow wrote:
Hi Marcus,
Thanks. Does that mean we need a new install of GR? The one
we have is quite recent.
build-gnuradio by default installs the "maint" branch--since that is,
generally, more likely to be somewhat-more-stable. If you use the -m
option to
build-gnuradio, it'll fetch "master".
This fix 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.
In terms of multi-channel daughtercards for N2xx/USRP1/X3xx/E1xx, yeah,
the TVRX2 is it.
But the B210 is dual-channel, strictly-coherent (they share the same
LO). Ken Tapping and I have been doing C-band correlation
interferometry with
one.
--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/%7Emarlow/gnuradio/TVRX2.png>
http://www.hep.princeton.edu/~marlow/gnuradio/TVRX2.grc
<http://www.hep.princeton.edu/%7Emarlow/gnuradio/TVRX2.grc>
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--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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--
Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium
http://www.sbrac.org
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