Re: [Discuss-gnuradio] [ Calculating the amplitude of a signal source ]
** (i) How many *bytes* does each I or Q component take? -- Ashish For complex samples, the file-sink writes native, IEEE-754 single-precision floating-point values into the file, with I and Q interleaved. IEEE-754 single-precision is 32-bits, and is the native binary format used by most CPUs. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] New to list, trying portaudio under OpenBSD
On Sat, Dec 15, 2012 at 12:15 AM, Alan Corey alan01...@gmail.com wrote: I've got my disabled list down to: -- * gr-comedi -- * gr-qtgui -- * gr-uhd -- * gr-shd -- * gr-fcd -- * gr-wxgui But mostly I've just been finding dependancies and installing them. I think I'm going to have to give up on gr-fcd because there seems to be some thread stuff in there that OpenBSD doesn't do. OpenBSD's pthread.h is quite a bit different than Debian's pthread.h. OpenBSD's had thread issues for a while. I found it does have Jack audio in ports so I don't need portaudio to work. I don't think I need fcd because my dongle isn't a Funcube but I think I do need either wxgui or qtgui to work. I'm completely new to Gnuradio so I'm not sure what I need. Alan Unless you want to prove that you can get all components working under OpenBSD, you definitely don't need to stress about all of them. gr-comedi, gr-fcd, gr-shd, and gr-uhd are specific to certain hardware systems. Just focus on the ones you are actually interested in. You'll probably want one of the GUI components, though. I prefer gr-qtgui, but most of the GR apps and examples in the source code are based on gr-wxgui, so that might be the one you want to focus on. Tom On 12/14/12, Tom Rondeau t...@trondeau.com wrote: On Fri, Dec 14, 2012 at 1:54 AM, Alan Corey alan01...@gmail.com wrote: I'm working on installing gnuradio under OpenBSD, just got GRC working. I have no audio, since gnuradio doesn't handle OpenBSD's native audio and it also doesn't recognize my existing portaudio which works with Audacity. I can set it up in my cmake cache but it still doesn't find it. I'm running the standard OpenBSD port portaudio-svn-1406p1 built from sources. I've had a little experience writing things in C that work with native audio but I don't know much about portaudio except it's working for other things like Fldigi. I see NetBSD has gnuradio-audio-portaudio which may be different than their normal portaudio but I don't find source for it, only binaries. OpenBSD audio is very similar to NetBSD's having borrowed a lot including audio manpages. I'll have other questions, right now I've also got no working gui. But I've only had my dongle since Monday. It's an RTL2832 with a R820T tuner. I'm trying to get some software for it working, I try Gnuradio, osmocom, sdr#, hdsdr in round robin fashion working on one until I hit a stopping point then on to another. Osmocom's rtl_fm is the only thing even partly working so far. I get little bursts of audio about 1 per minute. Alan, ab1jx -- Credit is the root of all evil. - AB1JX Hi Alan, I can't really help you or give much advice to working on GNU Radio in OpenBSD. But I if you make progress in getting things set up, please help us by updating the wiki's notes for building. And if there are specific issues that can be addressed by patches to the build system, please send them along (by using the Issues tracker on gnuradio.org). Tom -- Credit is the root of all evil. - AB1JX ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] QT GUI FFTSINK in C++ Flowgraph
On Sun, Dec 16, 2012 at 5:23 PM, Daniel Labarowski labarowsk...@gmail.comwrote: I've been toying around with this a bit more. I added #include QWidget to the top of my program. I also added QWidget* parent = new QWidget; before my call to qtgui_make_sink_c and replaced QWidget *parent=NULL white parent. I am now getting the following error top_block.cc:(.text+0x8cd): undefined reference to `QWidget::QWidget(QWidget*, QFlagsQt::WindowType)' top_block.cc:(.text+0x94f): undefined reference to `qtgui_make_sink_c(int, int, double, double, std::basic_stringchar, std::char_traitschar, std::allocatorchar const, bool, bool, bool, bool, QWidget*)' I've double checked what little documentation I can find on qtgui_make_sink_c and I think that I am passing appropriate parameters. Any thoughts on what might be wrong? -Dan This suggests that you are not linking against libgnuradio-qtgui.so. Make sure you are (-lgnuradio-qtgui should be used when linking). You probably also want to use NULL for the parent. As it is now, you're using an empty QWidget, and I'm not sure what will happen with that, but it probably won't work as expected. From your first email, it looks like you are passing QWiget* parent=NULL as the last parameter. Just say NULL here, instead. I've never tried to use QTGUI in C++ apps, so I'm curious to know if you can get it to work. Tom On 12/15/2012 02:07 AM, Daniel Labarowski wrote: Hello, I am attempting to use qt gui widgets in a C++ flowgraph. I managed to get all of the build dependencies figured out, which was no easy task in itself and required a lot of direct includes. Anyway, the error that I am getting now deals directly with the make function. The line that is giving me trouble is as follows qtgui_sink_c_sptr qtsink = qtgui_make_sink_c (fftsize, gr_firdes::WIN_HAMMING, 0, 1.0, Spectrum Display, true, true, true, true, QWidget *parent=NULL); Information on this function is available here.http://gnuradio.org/redmine/projects/gnuradio/wiki/TutorialsQTGUIThe error that I am getting is that parent is undefined. I really don’t know what to put for this. Note that I have also tried putting just NULL or just 0 and it throws an undefined reference error (for the function call). I was wondering if someone could give me some pointers on what to use for parent? While I would eventually like to have both an fft and a time domain view in a single window, I am currently just trying to get the fft to show in its own window. Thanks ahead of time! -Dan ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] QT GUI FFTSINK in C++ Flowgraph
I've never tried to use QTGUI in C++ apps, so I'm curious to know if you can get it to work. Tom I believe that gqrx is an instance of an app that uses both QtGUI, and Gnu Radio, and is largely written in C++, and is open source. Valuable hints might be gleaned by looking at that source code. -- Marcus Leech Principal Investigator Shirleys Bay Radio Astronomy Consortium http://www.sbrac.org ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] QT GUI FFTSINK in C++ Flowgraph
On Mon, Dec 17, 2012 at 4:47 PM, Marcus D. Leech mle...@ripnet.com wrote: I've never tried to use QTGUI in C++ apps, so I'm curious to know if you can get it to work. Tom I believe that gqrx is an instance of an app that uses both QtGUI, and Gnu Radio, and is largely written in C++, and is open source. Valuable hints might be gleaned by looking at that source code. Hi Marcus, The initial gqrx was a python application that used gr-qtgui. Since then I have started from scratch and created a new application using C++ and Qt for gui but not the gr-qtgui component. Alex ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
Re: [Discuss-gnuradio] FSK performance as a function of Fd?
On 12/17/12 06:13, Matt Ettus wrote: On Sun, Dec 16, 2012 at 2:27 PM, Joanna Rutkowska joa...@invisiblethingslab.com wrote: This is an FSK receiver from Atmel. Even though it apparently supports only data rates between 1-20 kbps, its supported Fd is within a range of 18kHz-50kHz. This seems to contradict your theory above -- why would Atmel use such a wide bandwith if they could just use no more than 20kHz for 20kbps? Joanna, Increasing deviation beyond the deviation of MSK (i.e. the minimum) does not help performance, but it can help ease receiver design. The reason to use a very high deviation at a low data rate is to make it easier to deal with frequency error with low cost crystals. If you have low cost 50ppm crystals on both ends, you could have 100 ppm total error. 100 ppm at 450 MHz is 45kHz. Spreading the 2 tones further apart allows you to guarantee that one will always have positive deviation and the other will have negative deviation. The FSK demodulation method with 2 filters is almost never used. This chip likely uses either direct frequency measurement (derivative of phase) or a PLL. Matt Thanks Matt. This makes sense. joanna. signature.asc Description: OpenPGP digital signature ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] hiiii gudmng fnds,
Hi all, I have recorded a sinusoidal USRP signal (generated by a vector signal generator) in its complex form in a file_sink. I understand that the file_sink will have the I-Q data of the signal. Can anyone tell me in what format that I-Q data will be stored i.e (i) How many bites does each I or Q component take? (ii) What will be their pattern in the file_sink i.e whether they would be in (I1, Q1, I2, Q2 ... Ik, Qk) form OR (I1, Q1, I1, Q1, I2, Q2, I2, Q2 ..) sequence OR any other sequence? My purpose is to parse the I-Q data from the file_sink. Have attached the WX_GUI_Sink plot of the signal received in complex form (in GRC). ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
[Discuss-gnuradio] gr-howto-write-a-block build fails
Dear List, I'm looking to write c++ gnuradio blocks using the gr-howto-write-a-block code that comes with gnuradio. Unfortunately, when I do the build with the existing code, the tests fail. Has anyone else seen this? I'm running Ubuntu 12.10. -- ttracy@ubuntu:~/Documents/src/gnuradio/gr-howto-write-a-block/build$ sudo cmake ../ -- The CXX compiler identification is GNU 4.7.2 -- The C compiler identification is GNU 4.7.2 -- Check for working CXX compiler: /usr/bin/c++ -- Check for working CXX compiler: /usr/bin/c++ -- works -- Detecting CXX compiler ABI info -- Detecting CXX compiler ABI info - done -- Check for working C compiler: /usr/bin/gcc -- Check for working C compiler: /usr/bin/gcc -- works -- Detecting C compiler ABI info -- Detecting C compiler ABI info - done -- Build type not specified: defaulting to release. -- Boost version: 1.49.0 -- Found PkgConfig: /usr/bin/pkg-config (found version 0.26) -- checking for module 'gruel' -- found gruel, version 3.6.3git -- Found GRUEL: /usr/local/lib/libgruel.so -- checking for module 'gnuradio-core' -- found gnuradio-core, version 3.6.3git -- Found GNURADIO_CORE: /usr/local/lib/libgnuradio-core.so -- Boost version: 1.49.0 -- Found the following Boost libraries: -- unit_test_framework -- Found SWIG: /usr/bin/swig2.0 (found version 2.0.7) -- Found PythonLibs: /usr/lib/python3.2/config/libpython3.2.so (found version 2.7.3) -- Found PythonInterp: /usr/bin/python (found version 2.7.3) -- Found Doxygen: /usr/bin/doxygen (found version 1.8.1.2) -- Configuring done -- Generating done -- Build files have been written to: /home/ttracy/Documents/src/gnuradio/gr-howto-write-a-block/build ttracy@ubuntu:~/Documents/src/gnuradio/gr-howto-write-a-block/build$ sudo make Scanning dependencies of target gnuradio-howto [ 5%] Building CXX object lib/CMakeFiles/gnuradio-howto.dir/howto_square_ff.cc.o [ 10%] Building CXX object lib/CMakeFiles/gnuradio-howto.dir/howto_square2_ff.cc.o Linking CXX shared library libgnuradio-howto.so [ 10%] Built target gnuradio-howto Scanning dependencies of target qa_howto_square2_ff [ 15%] Building CXX object lib/CMakeFiles/qa_howto_square2_ff.dir/qa_howto_square2_ff.cc.o Linking CXX executable qa_howto_square2_ff [ 15%] Built target qa_howto_square2_ff Scanning dependencies of target qa_howto_square_ff [ 20%] Building CXX object lib/CMakeFiles/qa_howto_square_ff.dir/qa_howto_square_ff.cc.o Linking CXX executable qa_howto_square_ff [ 20%] Built target qa_howto_square_ff Scanning dependencies of target _howto_swig_swig_tag [ 25%] Building CXX object swig/CMakeFiles/_howto_swig_swig_tag.dir/_howto_swig_swig_tag.cpp.o Linking CXX executable _howto_swig_swig_tag [ 25%] Built target _howto_swig_swig_tag Scanning dependencies of target _howto_swig_doc_tag [ 30%] Building CXX object swig/CMakeFiles/_howto_swig_doc_tag.dir/_howto_swig_doc_tag.cpp.o Linking CXX executable _howto_swig_doc_tag [ 30%] Built target _howto_swig_doc_tag [ 35%] Generating doxygen xml for howto_swig_doc docs [ 40%] Generating howto_swig_doc.i [ 45%] Generating howto_swig.tag [ 50%] Swig source Scanning dependencies of target _howto_swig [ 55%] Building CXX object swig/CMakeFiles/_howto_swig.dir/howto_swigPYTHON_wrap.cxx.o Linking CXX shared module _howto_swig.so [ 55%] Built target _howto_swig Scanning dependencies of target pygen_swig_cc723 [ 60%] Generating howto_swig.pyc [ 65%] Generating howto_swig.pyo [ 85%] Built target pygen_swig_cc723 Scanning dependencies of target pygen_python_257bc [ 90%] Generating __init__.pyc [ 95%] Generating __init__.pyo [ 95%] Built target pygen_python_257bc Scanning dependencies of target pygen_apps_58acf [100%] Shebangin howto_square.py [100%] Built target pygen_apps_58acf ttracy@ubuntu:~/Documents/src/gnuradio/gr-howto-write-a-block/build$ sudo make test Running tests... Test project /home/ttracy/Documents/src/gnuradio/gr-howto-write-a-block/build Start 1: qa_howto_square_ff 1/3 Test #1: qa_howto_square_ff ... Passed0.01 sec Start 2: qa_howto_square2_ff 2/3 Test #2: qa_howto_square2_ff .. Passed0.01 sec Start 3: qa_howto 3/3 Test #3: qa_howto .***Failed0.14 sec 67% tests passed, 1 tests failed out of 3 Total Test time (real) = 0.15 sec The following tests FAILED: 3 - qa_howto (Failed) Errors while running CTest make: *** [test] Error 8 -- Sincerely, Tommy James Tracy II PhD Student High Performance Low Power Lab University of Virginia ___ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
