# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=14 [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:** 15 --- ## [Additional code to GRC flowgraph](https://www.ruby-forum.com/t/additional-code-to-grc-flowgraph/242573)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 6\ **Last updated:** [July 6, 2015, 3:52pm UTC](https://www.ruby-forum.com/t/additional-code-to-grc-flowgraph/242573 "2015-07-06T15:52:35Z")
Hi I’m working with a receiver application in GNU Radio Companion. I would like to add some additional code to the top block but I still want to be able to work with the GRC. Is there a way to add this extra code with… --- ## [Re: QAM and Chunks\_to\_Symbol](https://www.ruby-forum.com/t/re-qam-and-chunks-to-symbol/242600)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [July 6, 2015, 3:49pm UTC](https://www.ruby-forum.com/t/re-qam-and-chunks-to-symbol/242600 "2015-07-06T15:49:05Z")
Every memoryless modulation scheme can be described as M vectors in an N-dimensional space. So the chunck-to-symbols requires as dimensionality parameter the N and then it needs this array of numbers s11, s12, … s1N, … --- ## [Errors in FEC gnruadio](https://www.ruby-forum.com/t/errors-in-fec-gnruadio/242583)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [July 6, 2015, 12:19pm UTC](https://www.ruby-forum.com/t/errors-in-fec-gnruadio/242583 "2015-07-06T12:19:55Z")
Hi list, I was not getting reply on the previous thread so I though to start a new thread. gnuradio version 3.7.7.1 ubunutu 14.04 32-bit I am trying to use gr-fec and I am having issues running examples located i… --- ## [Segmentation fault due to thread unsafety?](https://www.ruby-forum.com/t/segmentation-fault-due-to-thread-unsafety/242582)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [July 6, 2015, 9:51am UTC](https://www.ruby-forum.com/t/segmentation-fault-due-to-thread-unsafety/242582 "2015-07-06T09:51:31Z")
Hi all, I suspect I’m having problems with different threads which gives me a segmentation fault. Hopefully someone with knowledge on how this works with GNU radio can give me a hint for a solution. What I did is as … --- ## [Asking help about gr-ieee802.11](https://www.ruby-forum.com/t/asking-help-about-gr-ieee802-11/242591)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [July 6, 2015, 8:38am UTC](https://www.ruby-forum.com/t/asking-help-about-gr-ieee802-11/242591 "2015-07-06T08:38:44Z")
hi. I am newbie of gnuradio.i try run wifi\_loopback.grc, all the port are connected.but when i run it comes out with this messege below: Generating: “/home/user/gr-ieee802-11/examples/wifi\_loopback.py” Warning: Thi… --- ## [QAM and Chunks\_to\_Symbol](https://www.ruby-forum.com/t/qam-and-chunks-to-symbol/242592)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [July 6, 2015, 8:30am UTC](https://www.ruby-forum.com/t/qam-and-chunks-to-symbol/242592 "2015-07-06T08:30:54Z")
Hello, How can I specify symbol table and dimension for QAM in chunks\_to\_symbol block? which modulation is indicating in fsm\_utils.py by orth2 orth4? Can anybody help me. I am new to this GnuRadio. ThankYou With … --- ## [Two questions re VOLK armv7](https://www.ruby-forum.com/t/two-questions-re-volk-armv7/242578)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [July 5, 2015, 3:09am UTC](https://www.ruby-forum.com/t/two-questions-re-volk-armv7/242578 "2015-07-05T03:09:04Z")
1: To get VOLK to compile correctly under gnuradio, I need to include -march=armv7 in CFLAGS (volk/lib/CMakeLists.txt) which I do with a tool chain file with volk git’d outside gnuradio. root@cubieboard4:/mnt/volk… --- ## [Graph Stuck after a few vectors](https://www.ruby-forum.com/t/graph-stuck-after-a-few-vectors/242581)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [July 4, 2015, 4:00pm UTC](https://www.ruby-forum.com/t/graph-stuck-after-a-few-vectors/242581 "2015-07-04T16:00:12Z")
I have attached a screenshot of my design. when I start simulating it stuck and only plot a few vectors of data. I think it’s becasue of variable time shift block, it’s a hierarchy block, when I connect a constant so… --- ## [Raspberry PI 2 build failure](https://www.ruby-forum.com/t/raspberry-pi-2-build-failure/242503)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [July 4, 2015, 10:37am UTC](https://www.ruby-forum.com/t/raspberry-pi-2-build-failure/242503 "2015-07-04T10:37:44Z")
Hello, I have been attempting to build gnu radio on a Raspberry PI 2 running Debian Wheezy. I believe I have properly built and installed the latest releases of the gnu radio dependencies. However the gnu radio build … --- ## [Regarding Academic project](https://www.ruby-forum.com/t/regarding-academic-project/242579)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [July 4, 2015, 9:39am UTC](https://www.ruby-forum.com/t/regarding-academic-project/242579 "2015-07-04T09:39:20Z")
Dear Sir, I wish to know what kind of academic projects can be done with GNU radio for Electronics and Telecommunication background. Regards, Shriraghavan --- ## [Osx 10.10](https://www.ruby-forum.com/t/osx-10-10/242534)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 5\ **Last updated:** [July 3, 2015, 9:54pm UTC](https://www.ruby-forum.com/t/osx-10-10/242534 "2015-07-03T21:54:14Z")
Michael, A few months ago, I upgraded to OSX 10.10.1 Yosemite. My existing install of GnuRadio 3.7.5 continued to work, but today I tried to recompile an OOT module and it failed. Something about a library incompat… --- ## [SOCIS project update 5](https://www.ruby-forum.com/t/socis-project-update-5/242575)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [July 3, 2015, 8:34pm UTC](https://www.ruby-forum.com/t/socis-project-update-5/242575 "2015-07-03T20:34:47Z")
Hey community! It’s Friday! So it’s time for another project update. This week was all about decoders. After I had finished a successive cancellation decoder, I started working on a successive cancellation list decod… --- ## [Problem with TCP Source and TCP Sink Block](https://www.ruby-forum.com/t/problem-with-tcp-source-and-tcp-sink-block/242569)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [July 3, 2015, 8:12pm UTC](https://www.ruby-forum.com/t/problem-with-tcp-source-and-tcp-sink-block/242569 "2015-07-03T20:12:35Z")
Hi I am using GNU Radio 3.6.4.2 on Ubuntu 12.04. I am unable to use the TCP Source and Sink blocks which I want to connect to hardware. Whenever I use them, I get the following error: File “/home/vlab/Documents/top\_b… --- ## [Re: PCCC Decoder Combo- OFDM](https://www.ruby-forum.com/t/re-pccc-decoder-combo-ofdm/242574)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [July 3, 2015, 6:53pm UTC](https://www.ruby-forum.com/t/re-pccc-decoder-combo-ofdm/242574 "2015-07-03T18:53:07Z")
Pccc decoder combo requires the modulation as a parameter because it needs to evaluate soft decisions from the noisy complex QPSK signal that it receives. In that sense, it is NOT doing demodulation, as it is not sup… --- ## [Writing RSSI Values to a File Twice/Sec](https://www.ruby-forum.com/t/writing-rssi-values-to-a-file-twice-sec/242564)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 6\ **Last updated:** [July 3, 2015, 4:58pm UTC](https://www.ruby-forum.com/t/writing-rssi-values-to-a-file-twice-sec/242564 "2015-07-03T16:58:38Z")
Hi all, I’m new to GNURadio and I’m trying to use a USRP E310 to capture GSM signals from a cellphone and store the RSSI values in a text file. If you take a look at my flow graph I’ve managed to capture the average … --- ## [Gr-lte chanel estimation](https://www.ruby-forum.com/t/gr-lte-chanel-estimation/242547)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [July 3, 2015, 2:25pm UTC](https://www.ruby-forum.com/t/gr-lte-chanel-estimation/242547 "2015-07-03T14:25:34Z")
Hi all, I’m working at putting together a flowgraph based on gr-lte. For the channel estimator hier block \[1\], it looks like there are two RS map generators, one for each of 2 “antenna ports”. I only have one antenna… --- ## [Install UHD after GNURadio installation](https://www.ruby-forum.com/t/install-uhd-after-gnuradio-installation/242546)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [July 3, 2015, 1:54pm UTC](https://www.ruby-forum.com/t/install-uhd-after-gnuradio-installation/242546 "2015-07-03T13:54:01Z")
Hi, now I need to install also the UHD module of gnuradio(before I’ve used only RTL). Is possible to install this module without reinstall the entire gnuradio? I’ve tried the easiest apprach, mkdir/cmake/make… in gn… --- ## [Gr-fosphor driver issues](https://www.ruby-forum.com/t/gr-fosphor-driver-issues/242483)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [July 3, 2015, 11:50am UTC](https://www.ruby-forum.com/t/gr-fosphor-driver-issues/242483 "2015-07-03T11:50:11Z")
I’m using an AMD radeon HD 7900 in my computer. When i run a flowgraph that has an instance of fosphor it shuts down immediately and returns the following error: Using Volk machine: avx\_64\_mmx \[+\] Selected device: T… --- ## [Tag Offset Counter](https://www.ruby-forum.com/t/tag-offset-counter/242568)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [July 3, 2015, 7:54am UTC](https://www.ruby-forum.com/t/tag-offset-counter/242568 "2015-07-03T07:54:46Z")
Is there a way to access the counter used to give tag offsets for debug purposes without using tags? I’d like to be able to print item number when I’m not using tags. Rich --- ## [Is a unipolar signal bad as an input for a USRP receiver?](https://www.ruby-forum.com/t/is-a-unipolar-signal-bad-as-an-input-for-a-usrp-receiver/242563)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [July 2, 2015, 6:32pm UTC](https://www.ruby-forum.com/t/is-a-unipolar-signal-bad-as-an-input-for-a-usrp-receiver/242563 "2015-07-02T18:32:32Z")
I am using LFTX and LFRX to transmit and receive data between two nodes. I am modulating a bit stream with on-off keying (OOK) in which bit 1 is modulated into HIGH voltage and bit 0 is modulated into LOW voltage clos… --- ## [Suppressing UHD prints](https://www.ruby-forum.com/t/suppressing-uhd-prints/242540)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [July 2, 2015, 5:07pm UTC](https://www.ruby-forum.com/t/suppressing-uhd-prints/242540 "2015-07-02T17:07:48Z")
Hi all, UHD host library generates prints on the stdout. For example on each retune I get something like: – Tune Request: 959.000000 MHz – The RF LO does not support the requested frequency: – Requested LO Fr… --- ## [Fw: pybombs-gnuradio-install-missing files](https://www.ruby-forum.com/t/fw-pybombs-gnuradio-install-missing-files/242369)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 6\ **Last updated:** [July 2, 2015, 4:36pm UTC](https://www.ruby-forum.com/t/fw-pybombs-gnuradio-install-missing-files/242369 "2015-07-02T16:36:15Z")
After a lot of work, I am a beginner concerning gnuradio, only an average linux user concentration on PCLinuxOS, now have an awfull lot of files installed in my sandbox. I have had many goes at installing ‘pybombs’ a… --- ## [PCCC Decoder Combo- OFDM](https://www.ruby-forum.com/t/pccc-decoder-combo-ofdm/242554)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [July 2, 2015, 8:24am UTC](https://www.ruby-forum.com/t/pccc-decoder-combo-ofdm/242554 "2015-07-02T08:24:21Z")
Hello, I am usin OFDM Modulation and demodulation along with PCCC encoder and PCCC decoder… I am using QPSK modulation in OFDM. But Pccc decoder combo also using Demodulation parameter Constellation and Dimension. … --- ## [A two blocks synchronizing problem](https://www.ruby-forum.com/t/a-two-blocks-synchronizing-problem/242513)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 6\ **Last updated:** [July 2, 2015, 8:12am UTC](https://www.ruby-forum.com/t/a-two-blocks-synchronizing-problem/242513 "2015-07-02T08:12:39Z")
Hello I created 2 new blocks, one is an encoder and the other one a decoder. I needed the encoder block to had 8 input items (from a vector source) and 11 output items, so I set: consume each(8) and return(11). I did… --- ## [PCCC Decoder Combo- Ofdm](https://www.ruby-forum.com/t/pccc-decoder-combo-ofdm/242553)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [July 2, 2015, 7:31am UTC](https://www.ruby-forum.com/t/pccc-decoder-combo-ofdm/242553 "2015-07-02T07:31:11Z")
Hello, I am usin OFDM Modulation and demodulation along with PCCC encoder and PCCC decoder… I am using QPSK modulation in OFDM. But Pccc decoder combo also using Demodulation parameter Constellation and Dimension. … --- ## [Pccc Decoder with OFDM](https://www.ruby-forum.com/t/pccc-decoder-with-ofdm/242551)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [July 2, 2015, 7:24am UTC](https://www.ruby-forum.com/t/pccc-decoder-with-ofdm/242551 "2015-07-02T07:24:10Z")
Hello, I am usin OFDM Modulation and demodulation along with PCCC encoder and PCCC decoder… I am using QPSK modulation in OFDM. But Pccc decoder combo also using Demodulation parameter Constellation and Dimension. … --- ## [Block::system\_handler done message format](https://www.ruby-forum.com/t/block-system-handler-done-message-format/242552)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [July 2, 2015, 5:12am UTC](https://www.ruby-forum.com/t/block-system-handler-done-message-format/242552 "2015-07-02T05:12:44Z")
As I was investigating the message passing subsystem I noticed that my own blocks had a “system” port that I did not manually register. Looking through the code I found in block.cc the special message to put the block… --- ## [Message passing: strobe or \_post?](https://www.ruby-forum.com/t/message-passing-strobe-or-post/242549)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [July 2, 2015, 4:56am UTC](https://www.ruby-forum.com/t/message-passing-strobe-or-post/242549 "2015-07-02T04:56:58Z")
I am testing the capability of posting messages to Python blocks via Python. I have included below a simple example in which the Python block just prints out the message received. In one case, I send messages to thi… --- ## [Error importing GNU Radio's wxgui using gnuradio v3.7.7](https://www.ruby-forum.com/t/error-importing-gnu-radios-wxgui-using-gnuradio-v3-7-7/242516)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [July 2, 2015, 1:50am UTC](https://www.ruby-forum.com/t/error-importing-gnu-radios-wxgui-using-gnuradio-v3-7-7/242516 "2015-07-02T01:50:01Z")
Hi all, I’m new to GNU Radio and relatively new to Linux. I’m using UHD v3.8.4 for a USRP N210 on Ubuntu 14.04 LTS and wanted to begin using GNU Radio with UHD. I followed the install guide for installing UHD and GNU … --- ## [Loading FPGA file to 4 bladeRF devices on a single laptop](https://www.ruby-forum.com/t/loading-fpga-file-to-4-bladerf-devices-on-a-single-laptop/242541)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [July 1, 2015, 4:34pm UTC](https://www.ruby-forum.com/t/loading-fpga-file-to-4-bladerf-devices-on-a-single-laptop/242541 "2015-07-01T16:34:28Z")
Hi all, I want to use 4 bladeRF devices on a single laptop. This means I have to load the FPGA file to all of 4 bladeRF devices. However, currently I can only load the PFGA file to 2 devices. I am using the command: … [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=13) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=15)