# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=63 [Latest](https://www.ruby-forum.com/latest.md) · [Categories](https://www.ruby-forum.com/categories.md) · [Tags](https://www.ruby-forum.com/tags.md) **Page:** 64 --- ## [Morse code (CW) decoder for GNURadio](https://www.ruby-forum.com/t/morse-code-cw-decoder-for-gnuradio/230859)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 9, 2014, 2:00am UTC](https://www.ruby-forum.com/t/morse-code-cw-decoder-for-gnuradio/230859 "2014-07-09T02:00:59Z")
Dear all, I am looking for a morse code decoder for gnuradio, does anyone have a link? Regards Vanush --- ## [Using named pipe to communicate between flow graphs](https://www.ruby-forum.com/t/using-named-pipe-to-communicate-between-flow-graphs/230858)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 8, 2014, 11:49pm UTC](https://www.ruby-forum.com/t/using-named-pipe-to-communicate-between-flow-graphs/230858 "2014-07-08T23:49:49Z")
Hi, I’m trying to pass IQ data stream from one flow graph to another. Following is the description of the flow graphs- FlowGraph 1 - Sender Signal Source (samp-10M;freq-8M) TO 1.file sink(to named pipe) 2.GUI FFT s… --- ## [Passing messages to block values?](https://www.ruby-forum.com/t/passing-messages-to-block-values/230831)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [July 8, 2014, 4:54pm UTC](https://www.ruby-forum.com/t/passing-messages-to-block-values/230831 "2014-07-08T16:54:28Z")
GR 3.7.4 now has a message output on the QT GUI Frequency Sink. Is there way in GRC to pass this message to a value field within a block? For instance, pass it to the Center Frequency value in the UHD Source block … --- ## [Gr-dvbs2 DVB-S2 transmitter](https://www.ruby-forum.com/t/gr-dvbs2-dvb-s2-transmitter/234800)
**Author:** [@alcina](https://www.ruby-forum.com/u/alcina)\ **Replies:** 1\ **Last updated:** [July 8, 2014, 2:56am UTC](https://www.ruby-forum.com/t/gr-dvbs2-dvb-s2-transmitter/234800 "2014-07-08T02:56:11Z")
I’ve just completed a DVB-S2 transmitter for GnuRadio. This is a port of G4GUO’s DVB-S2 transmitter for the DATV-Express Digital Amateur Television project. The code includes an implementation of LDPC and BCH code… --- ## [No 'source' in Gnuradio Companion](https://www.ruby-forum.com/t/no-source-in-gnuradio-companion/230828)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [July 8, 2014, 12:19am UTC](https://www.ruby-forum.com/t/no-source-in-gnuradio-companion/230828 "2014-07-08T00:19:36Z")
Hi, I have just installed gnuradio companion on MacOS X, by means of MacPorts, in the hope of using it with rtl-sdr. The issue is I don’t see any ‘source’ item available for me to specify my input, when I look at the… --- ## [Questions about ofdm\_mapper\_bcv](https://www.ruby-forum.com/t/questions-about-ofdm-mapper-bcv/230827)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 7, 2014, 10:31pm UTC](https://www.ruby-forum.com/t/questions-about-ofdm-mapper-bcv/230827 "2014-07-07T22:31:34Z")
Dear All, I'm working on OFDM things now and trying to achieve OFDMA in gnuradio 3.7, the system is Ubuntu 12.07. Right now, for the ofdm\_mapper, it's function is to convert a stream of byte into complex number. Howe… --- ## [Gnuradio questions](https://www.ruby-forum.com/t/gnuradio-questions/230814)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [July 7, 2014, 6:34pm UTC](https://www.ruby-forum.com/t/gnuradio-questions/230814 "2014-07-07T18:34:09Z")
Goodmorning, I’m a PhD student working with gnuradio in ubuntu. The motivation for which I need to write is regarded to how gnuradio treats a project flow graph to make it as an application program, I have searched … --- ## [Reading data from a file](https://www.ruby-forum.com/t/reading-data-from-a-file/230815)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 7, 2014, 12:43pm UTC](https://www.ruby-forum.com/t/reading-data-from-a-file/230815 "2014-07-07T12:43:44Z")
Hi I did the following GRC to test psk modulation and demodulation. A text file is input and did modulated and demodulated. After demodulation the result is a pattern of \\x00\\ and \\x08?\\ where as I gave charactors 1, … --- ## [Build OOT gr-test2](https://www.ruby-forum.com/t/build-oot-gr-test2/230798)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 11\ **Last updated:** [July 7, 2014, 3:48am UTC](https://www.ruby-forum.com/t/build-oot-gr-test2/230798 "2014-07-07T03:48:31Z")
Ok… building my first OOT to play with his counter. git clone git://github.com/activecat/gr-test2 cmake seems to work (after I change boost version to 1.55 in CMakeLists.txt) on make i get this error. Searching the … --- ## [Message queues - Inconsistent data problem](https://www.ruby-forum.com/t/message-queues-inconsistent-data-problem/230681)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 3\ **Last updated:** [July 6, 2014, 4:58pm UTC](https://www.ruby-forum.com/t/message-queues-inconsistent-data-problem/230681 "2014-07-06T16:58:17Z")
Hello, I’m using Gnuradio version: v3.7.2.1-62 and am facing a strange issue with message queuing. I wrote a testing “hier” block which holds 2 message blocks (source + sink). #create blocks msgq\_in = gr.msg\_queue… --- ## [Benchmark\_ofdm\_mimo(trondeau branch mimo files)](https://www.ruby-forum.com/t/benchmark-ofdm-mimo-trondeau-branch-mimo-files/230790)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 6, 2014, 4:01pm UTC](https://www.ruby-forum.com/t/benchmark-ofdm-mimo-trondeau-branch-mimo-files/230790 "2014-07-06T16:01:42Z")
Hi all: Thanks in advance. I search the mail list and find “benchmark\_ofdm\_mimo” .(http://lists.gnu.org/archive/html/discuss-gnuradio/2012-02/msg00118.html) But I can’t find the file.Can someone tell me where can i f… --- ## [Using VOLK in a new gr-block](https://www.ruby-forum.com/t/using-volk-in-a-new-gr-block/230786)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [July 6, 2014, 3:59pm UTC](https://www.ruby-forum.com/t/using-volk-in-a-new-gr-block/230786 "2014-07-06T15:59:55Z")
Hi, I am trying to use VOLK in a new module that will have some new fast blocks (hopefully). Being new to the cmake system, I have some difficulty in including the volk headers and linking it. Specifically, I am tryi… --- ## [Difference b/w sample rate and symbols per second](https://www.ruby-forum.com/t/difference-b-w-sample-rate-and-symbols-per-second/230619)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 10\ **Last updated:** [July 5, 2014, 8:02pm UTC](https://www.ruby-forum.com/t/difference-b-w-sample-rate-and-symbols-per-second/230619 "2014-07-05T20:02:17Z")
Hi, I am bit confused b/w the two terms.I have read some material and i got the following relationship b/w the two: samples/second =samples/symbol \* symbols/second And i think in GRC samples per symbol is 1(plz corre… --- ## [GRC Working Group Meeting/Hangout](https://www.ruby-forum.com/t/grc-working-group-meeting-hangout/230602)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [July 4, 2014, 8:30am UTC](https://www.ruby-forum.com/t/grc-working-group-meeting-hangout/230602 "2014-07-04T08:30:38Z")
Hey, I have scheduled a GRC Working Group Meeting/Hangout for July 2nd, 17:00 UTC. There is a wiki page for the agenda. Feel free to populate. I will add my own items in the next few days. Sebastian – Karlsruhe Ins… --- ## [Missing internal callbacks](https://www.ruby-forum.com/t/missing-internal-callbacks/230776)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [July 4, 2014, 5:52am UTC](https://www.ruby-forum.com/t/missing-internal-callbacks/230776 "2014-07-04T05:52:51Z")
Hello- when creating a flowgraph in GRC there are times I would like to change the decimation on-the-fly with a gui slider. However, this does not work because the decimation factor in blocks such as the AM Demod or … --- ## [OFDM based systems - reducing undesired radiation](https://www.ruby-forum.com/t/ofdm-based-systems-reducing-undesired-radiation/230773)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 3, 2014, 8:13pm UTC](https://www.ruby-forum.com/t/ofdm-based-systems-reducing-undesired-radiation/230773 "2014-07-03T20:13:28Z")
Hello everyone, I am implementing a cognitive communication system inspired by GNURadio’s OFDM implementation and some custom designed spectrum sensing and management, medium access control, etc. In order to address … --- ## [Phase demodulation](https://www.ruby-forum.com/t/phase-demodulation/230650)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 2\ **Last updated:** [July 3, 2014, 6:19pm UTC](https://www.ruby-forum.com/t/phase-demodulation/230650 "2014-07-03T18:19:22Z")
Hello, This question is not strictly GNURadio related, but I hope to find people more knowledgeable than me here… I have a signal x(t) at a carrier frequency fc which is phase modulated. The phase modulation itself i… --- ## [\[GSoC\] Co-Processors Update #5](https://www.ruby-forum.com/t/gsoc-co-processors-update-5/230772)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 3, 2014, 12:22pm UTC](https://www.ruby-forum.com/t/gsoc-co-processors-update-5/230772 "2014-07-03T12:22:25Z")
Hello all, This update is past due. Progress: Finally got the FFTC to initialize but having trouble sending it data. I suspect there is something wrong with my initialization configuration. I’ve been able to use … --- ## [How do I know when my flow graph has finished in a non-blocking way?](https://www.ruby-forum.com/t/how-do-i-know-when-my-flow-graph-has-finished-in-a-non-blocking-way/230757)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [July 3, 2014, 11:59am UTC](https://www.ruby-forum.com/t/how-do-i-know-when-my-flow-graph-has-finished-in-a-non-blocking-way/230757 "2014-07-03T11:59:47Z")
Dear friends of GNU Radio, I have a question about blocking, threads and GUI. Thing is, I am writing an GUI application (in PyQT4) where the user can start a GNU Radio flowgraph by a button. The flowgraph records dat… --- ## [Gnuradio, blocks execution time](https://www.ruby-forum.com/t/gnuradio-blocks-execution-time/230769)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 3, 2014, 9:15am UTC](https://www.ruby-forum.com/t/gnuradio-blocks-execution-time/230769 "2014-07-03T09:15:23Z")
hi at all, I’m new in this forum. Is it possible to estimate the execution time of a specific block in a gnuradio flow graph? How can I make a gnuradio flowgraph in an application program ? Thank you in advan… --- ## [(no subject)](https://www.ruby-forum.com/t/no-subject/230761)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 3, 2014, 8:43am UTC](https://www.ruby-forum.com/t/no-subject/230761 "2014-07-03T08:43:05Z")
When I ran the example ofdm\_loopback.grc, i used a file source to send data through the transmitter and checked the output after the receiver in a file sink ; i found that if the packet required to be sent is less th… --- ## [Live DVD & X310](https://www.ruby-forum.com/t/live-dvd-x310/230679)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 3\ **Last updated:** [July 2, 2014, 6:24pm UTC](https://www.ruby-forum.com/t/live-dvd-x310/230679 "2014-07-02T18:24:30Z")
Hi, So I boot off of the Live DVD (3.7.4), and try GRC with an X310 and get an error about the firmware version being 3, when 4 was expected. I then use usrp\_x3xx\_fpga\_burner to update the firmware, which after a few… --- ## [Gr-lte errors](https://www.ruby-forum.com/t/gr-lte-errors/230709)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [July 2, 2014, 3:16pm UTC](https://www.ruby-forum.com/t/gr-lte-errors/230709 "2014-07-02T15:16:44Z")
Hi, I downloaded the GNU RADIO LTE receiver code and followed the instructions to install it, but unfortunately I couldn’t make it work. In these four example files I get the following errors: http://pastie.org/93412… --- ## [Contents of Discuss-gnuradio digest](https://www.ruby-forum.com/t/contents-of-discuss-gnuradio-digest/230738)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [July 2, 2014, 9:46am UTC](https://www.ruby-forum.com/t/contents-of-discuss-gnuradio-digest/230738 "2014-07-02T09:46:12Z")
Hi~ I use the uhd\_rx\_cfile to get the binary sample data, and I use gr\_plot\_psd\_c to draw the grcphic about the ‍binary sample data.‍ But I don’t know the x or y coordinates, I don’t how to do with it. Thanks. --- ## [NOOB needs help with simple.py](https://www.ruby-forum.com/t/noob-needs-help-with-simple-py/230729)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [July 2, 2014, 8:45am UTC](https://www.ruby-forum.com/t/noob-needs-help-with-simple-py/230729 "2014-07-02T08:45:58Z")
Hi all, I wanna work into this project, as I think its excellent! My box is a gentoo box running net-wireless/gnuradio-3.7.3:0/3.7.3 USE=“alsa analog digital examples fcd filter grc pager qt4 sdl uhd utils wavelet w… --- ## [Packet length is varying](https://www.ruby-forum.com/t/packet-length-is-varying/230731)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 1, 2014, 11:32pm UTC](https://www.ruby-forum.com/t/packet-length-is-varying/230731 "2014-07-01T23:32:14Z")
Dear all, If the length of the packets coming from an application is varying , But the most of them are 70 bytes & the app sends the packets in bursts not continuously. I use ofdm tx & ofdm rx & 2 usrps to send and … --- ## [Re: Help with wx-gui, window size error](https://www.ruby-forum.com/t/re-help-with-wx-gui-window-size-error/230652)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 1\ **Last updated:** [July 1, 2014, 9:27pm UTC](https://www.ruby-forum.com/t/re-help-with-wx-gui-window-size-error/230652 "2014-07-01T21:27:11Z")
I was not part of the mailing list when the thread was started so I could not properly reply. But the issue is a missing dependency of PyOpenGL. https://bugzilla.redhat.com/show\_bug.cgi?id=1049 I had the same issue … --- ## [Audio processing with USRP2 and LFRX](https://www.ruby-forum.com/t/audio-processing-with-usrp2-and-lfrx/230726)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 1, 2014, 8:11pm UTC](https://www.ruby-forum.com/t/audio-processing-with-usrp2-and-lfrx/230726 "2014-07-01T20:11:29Z")
Hi, I am attempting to use the Ettus USRP2 and LFRX daughterboard to process a low-frequency audio signal (between DC and 1 KHz). I have had no success so far in getting the uhd waterfall sink to display a spectrogram… --- ## [Simple block with constant rate](https://www.ruby-forum.com/t/simple-block-with-constant-rate/230592)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 9\ **Last updated:** [July 1, 2014, 3:31pm UTC](https://www.ruby-forum.com/t/simple-block-with-constant-rate/230592 "2014-07-01T15:31:37Z")
Hello, I’m doing a block with two inputs (signal and noise) and one output. Signal input block generates samples sometimes. For example: 2,3,-,-,4,-,-,-,5,1,1,-,4,55… Noise block generates samples always. For example… --- ## [Simple fm tx](https://www.ruby-forum.com/t/simple-fm-tx/230720)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [July 1, 2014, 3:30pm UTC](https://www.ruby-forum.com/t/simple-fm-tx/230720 "2014-07-01T15:30:04Z")
hello, recently i have started to work on usrp b200 and to learn gnuradio. for the beginning i have tried to run two example: freq hopping multi freq when i ran the first one and some errors occurred (attached) the… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=62) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=64)