# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=45 [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:** 46 --- ## [Undefined symbol:fftwf\_execute](https://www.ruby-forum.com/t/undefined-symbol-fftwf-execute/232974)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 9, 2014, 10:02pm UTC](https://www.ruby-forum.com/t/undefined-symbol-fftwf-execute/232974 "2014-11-09T22:02:01Z")
Dear all, I am trying to implement cross correlation block using fftw library. I follow the correlation example in the gr-lte. when I try to run the block I get the following error: importError: /usr/local/lib/libgn… --- ## [VOLK WG call: scheduling a time](https://www.ruby-forum.com/t/volk-wg-call-scheduling-a-time/232905)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [November 8, 2014, 9:06pm UTC](https://www.ruby-forum.com/t/volk-wg-call-scheduling-a-time/232905 "2014-11-08T21:06:29Z")
Hi all, It’s about time for a VOLK WG call. If you’re interested in participating fill out your availablity at Once I see responses from a sufficient mass I’ll send out an email with the actual call time and prelimi… --- ## [Associate .grc with gnuradio-companion](https://www.ruby-forum.com/t/associate-grc-with-gnuradio-companion/232969)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 8, 2014, 2:16am UTC](https://www.ruby-forum.com/t/associate-grc-with-gnuradio-companion/232969 "2014-11-08T02:16:24Z")
It seems that the pybomb install process doesn’t associate .grc files with gnuradio-companion. I’ve installed it on two computers with that result now. I’ve done some reading on the issue, and I understand I have to d… --- ## [Packet sequence numbers](https://www.ruby-forum.com/t/packet-sequence-numbers/232970)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 7, 2014, 8:16pm UTC](https://www.ruby-forum.com/t/packet-sequence-numbers/232970 "2014-11-07T20:16:07Z")
I’m using a vector-insert block to add a fixed-size header to a stream of interleaved short samples at a fixed interval, and then running it though stream-to-tagged-stream =\> tagged-stream-to-PDU =\> Socket-PDU to wra… --- ## [Conditional switching between two subroutines in real-time](https://www.ruby-forum.com/t/conditional-switching-between-two-subroutines-in-real-time/232967)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 7, 2014, 5:33pm UTC](https://www.ruby-forum.com/t/conditional-switching-between-two-subroutines-in-real-time/232967 "2014-11-07T17:33:49Z")
Hi, In GRC, I need to switch back and forth (in real time) between two subroutines based on some conditional ‘IF’ statement. For example, ‘after’ some preset lapse of time. Is it possible to do that? Please note tha… --- ## [802.11 Beacon frame transmitter - mobile devices](https://www.ruby-forum.com/t/802-11-beacon-frame-transmitter-mobile-devices/232947)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [November 7, 2014, 11:11am UTC](https://www.ruby-forum.com/t/802-11-beacon-frame-transmitter-mobile-devices/232947 "2014-11-07T11:11:20Z")
Greetings After creating beacon frames transmitter based on usrp i decided to check its performance. Im sending a beacon frames and correctly decoding it by my wlan card (in monitor mode - screen attached). http://… --- ## [Grcc issues](https://www.ruby-forum.com/t/grcc-issues/232950)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [November 6, 2014, 8:44pm UTC](https://www.ruby-forum.com/t/grcc-issues/232950 "2014-11-06T20:44:58Z")
I have a flow-graph: https://www.cgran.org/svn/projects/simple\_ra It comes with a makefile, which sets up PYTHONPATH, and calls grcc -d That grcc -d consistently fails (“Error during compilation”) Yet, when I bring t… --- ## [LTE Cell Scanner support bladeRF now (Vritual machine test results also attached)](https://www.ruby-forum.com/t/lte-cell-scanner-support-bladerf-now-vritual-machine-test-results-also-attached/232882)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [November 6, 2014, 6:26am UTC](https://www.ruby-forum.com/t/lte-cell-scanner-support-bladerf-now-vritual-machine-test-results-also-attached/232882 "2014-11-06T06:26:54Z")
After LTE-Cell-Scanner https://github.com/JiaoXianjun/LTE-Cell-Scanner supports rtlsdr hackRF, now it supports bladeRF http://sdr-x.github.io/LTE-Cell-Scanner%20supports%20bladeRF%20now%20(LTE小区搜索程序新增bladeRF硬件支持)/ ! H… --- ## [Building GNURadio on Mac 10.9.5 using Homebrew Problems](https://www.ruby-forum.com/t/building-gnuradio-on-mac-10-9-5-using-homebrew-problems/232941)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 6, 2014, 1:21am UTC](https://www.ruby-forum.com/t/building-gnuradio-on-mac-10-9-5-using-homebrew-problems/232941 "2014-11-06T01:21:09Z")
Gurus: I am trying to build gnuradio on Mac OS 10.9.5 using homebrew and I cant seem to get past this error: \[ 38%\] Generating codec2/codebookd.c cd /tmp/gnuradio-t1vtKS/build/gr-vocoder/lib && ./generate\_codebook l… --- ## [LIBUSB\_ERROR\_PIPE and "improperly" stopping gnuradio](https://www.ruby-forum.com/t/libusb-error-pipe-and-improperly-stopping-gnuradio/232924)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 9\ **Last updated:** [November 5, 2014, 11:42pm UTC](https://www.ruby-forum.com/t/libusb-error-pipe-and-improperly-stopping-gnuradio/232924 "2014-11-05T23:42:45Z")
Hello all, I am facing a strange problem when I am starting my gnuradio script. I keep getting the following message. – Operating over USB 3. Traceback (most recent call last): File “file\_sinks.py”, line 104, in … --- ## [Markup GRC Flowgraph](https://www.ruby-forum.com/t/markup-grc-flowgraph/232934)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 5, 2014, 5:58pm UTC](https://www.ruby-forum.com/t/markup-grc-flowgraph/232934 "2014-11-05T17:58:22Z")
Hi all, I would like to know if there is any way to add textboxes to a GRCs flowgraph for notes and documentation? Thanks, Rich --- ## [Hierarchical Block in c++ not working, linker or swig problem](https://www.ruby-forum.com/t/hierarchical-block-in-c-not-working-linker-or-swig-problem/232798)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 5, 2014, 4:46pm UTC](https://www.ruby-forum.com/t/hierarchical-block-in-c-not-working-linker-or-swig-problem/232798 "2014-11-05T16:46:10Z")
Hi list. I am trying to write a hierarchical block in c++ in an OOT module. I create the block with the gr\_modtool and try to make a very simple hier block. The only relevant changes to the template are: in the …impl… --- ## [Ber vs ebno](https://www.ruby-forum.com/t/ber-vs-ebno/232930)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 5, 2014, 3:26pm UTC](https://www.ruby-forum.com/t/ber-vs-ebno/232930 "2014-11-05T15:26:45Z")
Hi every1, i would like to see the performance of a system BDPK. I saw in the gnu web page ( http://gnuradio.org/redmine/projects/gnuradio/wiki/Simulations )one graphic, in which could see the BER VS EBNO. i want to … --- ## [Messages getting dropped](https://www.ruby-forum.com/t/messages-getting-dropped/232907)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 5, 2014, 3:24pm UTC](https://www.ruby-forum.com/t/messages-getting-dropped/232907 "2014-11-05T15:24:58Z")
Hi list, I have a strange problem with one of my custom blocks. It’s a char stream sink with a message output. It basically takes the input stream, selects a few samples, packs them into blobs, makes a pmt::cons out… --- ## [Works with GR 3.6, breaks with 3.7](https://www.ruby-forum.com/t/works-with-gr-3-6-breaks-with-3-7/232512)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 24\ **Last updated:** [November 5, 2014, 2:29am UTC](https://www.ruby-forum.com/t/works-with-gr-3-6-breaks-with-3-7/232512 "2014-11-05T02:29:37Z")
I have a GnuRadio C++ program that decodes and records a SmartNet Trunked radio system. It is running great under GnuRadio 3.6.5.1, but it doesn’t seem to be working under 3.7.6. 3.6 is installed in /usr/local and 3.7… --- ## [Rpc server setup](https://www.ruby-forum.com/t/rpc-server-setup/232919)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 5, 2014, 12:50am UTC](https://www.ruby-forum.com/t/rpc-server-setup/232919 "2014-11-05T00:50:35Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Error rate](https://www.ruby-forum.com/t/error-rate/232912)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 4, 2014, 3:33pm UTC](https://www.ruby-forum.com/t/error-rate/232912 "2014-11-04T15:33:13Z")
Hi, i would like get the error rate of my dbpsk system, the problem is that the inputs of the ERROR RATE block have to be syncronized because of the delay. how can i do that? some suggestions. regards Lucas --- ## [Hello! This is bean, I am studying in Tokyo institute of technology in Japan, I am trying to mak](https://www.ruby-forum.com/t/hello-this-is-bean-i-am-studying-in-tokyo-institute-of-technology-in-japan-i-am-trying-to-mak/232906)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 4, 2014, 9:32am UTC](https://www.ruby-forum.com/t/hello-this-is-bean-i-am-studying-in-tokyo-institute-of-technology-in-japan-i-am-trying-to-mak/232906 "2014-11-04T09:32:08Z")
Hello! This is bean, I am studying in Tokyo institute of technology in Japan, I am trying to make a SISO channel sounder using two USRPN210. I am facing a problem that PC cannot pick up all the samples from USRP when… --- ## [RX channel 1 out of range for configured RX frontends](https://www.ruby-forum.com/t/rx-channel-1-out-of-range-for-configured-rx-frontends/232904)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [November 4, 2014, 12:20am UTC](https://www.ruby-forum.com/t/rx-channel-1-out-of-range-for-configured-rx-frontends/232904 "2014-11-04T00:20:36Z")
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 lo… --- ## [UHD: usrp modules](https://www.ruby-forum.com/t/uhd-usrp-modules/232859)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [November 3, 2014, 6:14pm UTC](https://www.ruby-forum.com/t/uhd-usrp-modules/232859 "2014-11-03T18:14:18Z")
Hi, I’ve installed the GNURadio & UHD correctly. However, I can’t use my USRP because I don’t have installed the UHD module in my tree of modules of the Gnuradio 3.6.5.1 But I can see in the path of the file system… --- ## [Mac OS X 10.10 Advice](https://www.ruby-forum.com/t/mac-os-x-10-10-advice/232645)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 7\ **Last updated:** [November 3, 2014, 3:01pm UTC](https://www.ruby-forum.com/t/mac-os-x-10-10-advice/232645 "2014-11-03T15:01:00Z")
GNU Radio and UHD seem to generally work well with the recently released Mac OS X 10.10. In my testing, everything in UHD works. And, everything in GNU Radio works -except- for executing flow-graphs from with the GN… --- ## [Midi control surface?](https://www.ruby-forum.com/t/midi-control-surface/232900)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 3, 2014, 1:37pm UTC](https://www.ruby-forum.com/t/midi-control-surface/232900 "2014-11-03T13:37:30Z")
Hi, does anyone know if it’s possible to add midi control to sliders in gnuradio-companion? I have a lot of sliders I wish to cintrol with hardware. If not midi what is the preferred way to add hardware knobs sliders … --- ## [Question about the synchronization symbol used in ofdm example](https://www.ruby-forum.com/t/question-about-the-synchronization-symbol-used-in-ofdm-example/232887)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [November 3, 2014, 8:15am UTC](https://www.ruby-forum.com/t/question-about-the-synchronization-symbol-used-in-ofdm-example/232887 "2014-11-03T08:15:54Z")
Hello all: Thank you in advance.I have two questions about the symbol used in ofdm example. 1.The first synchronization symbol is: n1=00000001.414213538169860-1.4142135381698601.414213538169860-1.414213538169860-1.41… --- ## [Gr-ctrlport-monitor (x) not installed?](https://www.ruby-forum.com/t/gr-ctrlport-monitor-x-not-installed/232893)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 3, 2014, 3:44am UTC](https://www.ruby-forum.com/t/gr-ctrlport-monitor-x-not-installed/232893 "2014-11-03T03:44:16Z")
I may have an issue with my ctrlport installation. I cannot find the file gr-ctrlport-monitor and gr-ctrlport-monitorx. I am on a fedora 19 64bit machine and this is the output of cmake on 3.7.6. thanks Achilleas =… --- ## [MakeEttusSDCard.sh](https://www.ruby-forum.com/t/makeettussdcard-sh/232858)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 2, 2014, 10:32pm UTC](https://www.ruby-forum.com/t/makeettussdcard-sh/232858 "2014-11-02T22:32:21Z")
regards, where I find the script MakeEttusSDCard.sh Thanks Julio H. --- ## [Switching muxed sinc sources](https://www.ruby-forum.com/t/switching-muxed-sinc-sources/232842)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 2, 2014, 5:31pm UTC](https://www.ruby-forum.com/t/switching-muxed-sinc-sources/232842 "2014-11-02T17:31:49Z")
Hi, I would like to try the muxed source stream switching method since the slector block is slow at switching between streams. I read its possible to switch demux N value as a way to switch between sources in a graph. … --- ## [Gr\_filter\_design issue](https://www.ruby-forum.com/t/gr-filter-design-issue/232752)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [November 2, 2014, 4:33pm UTC](https://www.ruby-forum.com/t/gr-filter-design-issue/232752 "2014-11-02T16:33:38Z")
Hi, I just noticed that “gr\_filter\_design” is throwing numpy error and fails to start (with latest gnuradio-git). I could atleast find one more guy complaining about this ( ). The issue in my case was with fro… --- ## [QT GUI Segmentation Fault](https://www.ruby-forum.com/t/qt-gui-segmentation-fault/232856)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [November 2, 2014, 4:30pm UTC](https://www.ruby-forum.com/t/qt-gui-segmentation-fault/232856 "2014-11-02T16:30:38Z")
Hi all, I recently installed GNURadio on two laptops (installation via PYBOMBs) and everything has been running fine for a few weeks; but I’m suddenly running into issues with QT GUI on one of the laptops. I wasn’t … --- ## [Adding offset to frequency messsage?](https://www.ruby-forum.com/t/adding-offset-to-frequency-messsage/232878)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 2, 2014, 4:16pm UTC](https://www.ruby-forum.com/t/adding-offset-to-frequency-messsage/232878 "2014-11-02T16:16:19Z")
I’m using the freq message output of the QT GUI Frequency Sink to drive the freq message input of the Frequency Translating FIR Filter. Since I have set the the Center Frequency of the QT Frequency Sink to 7E6 Hz, t… --- ## [Volk error](https://www.ruby-forum.com/t/volk-error/232870)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 2, 2014, 2:52pm UTC](https://www.ruby-forum.com/t/volk-error/232870 "2014-11-02T14:52:44Z")
Hello all, I have a c++ code containing “filter::fir\_filter\_ccc”, is built successfully, but there is an error when I run it due this filter: symbol lookup error: /usr/local/lib/libgnuradio-filter-3.7.5.so.0.0.0: und… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=44) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=46)