# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=40 [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:** 41 --- ## [HeirBlock2 Lock/Unlock breaks WavSink](https://www.ruby-forum.com/t/heirblock2-lock-unlock-breaks-wavsink/233687)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 4, 2015, 2:39pm UTC](https://www.ruby-forum.com/t/heirblock2-lock-unlock-breaks-wavsink/233687 "2015-01-04T14:39:58Z")
Short story - doing a Lock/Unlock on a HeirBlock2 to reconfigure its internal flow graph stops a WavFile\_Sink that is in it until a new wav file is opened. It doesn’t affect any File\_Sinks that are in the graph. If th… --- ## [4-to-32 bit symbol mapper block](https://www.ruby-forum.com/t/4-to-32-bit-symbol-mapper-block/233682)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [January 3, 2015, 7:39pm UTC](https://www.ruby-forum.com/t/4-to-32-bit-symbol-mapper-block/233682 "2015-01-03T19:39:36Z")
Hi list, I’d like to write a custom block that takes 1, 4-bit symbol and remaps it to 1, 32-bit symbol. Some code for a general\_work() method is below \[1\], but it doesn’t quite work yet. It isn’t convolutional - i.e.… --- ## [Integrate GNU radio and autonomous code](https://www.ruby-forum.com/t/integrate-gnu-radio-and-autonomous-code/233681)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 3, 2015, 6:18pm UTC](https://www.ruby-forum.com/t/integrate-gnu-radio-and-autonomous-code/233681 "2015-01-03T18:18:05Z")
Hi, I am designing a fully autonomous quad copter that will track the signals coming from a cell phone using USRP/GNU radio. I have to integrate both, but I have not found a tutorial or a guide to show how to do it. … --- ## [Peak\_Detector2 stalls simulation](https://www.ruby-forum.com/t/peak-detector2-stalls-simulation/233669)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 2, 2015, 6:14pm UTC](https://www.ruby-forum.com/t/peak-detector2-stalls-simulation/233669 "2015-01-02T18:14:35Z")
Hello and Season’s Greetings, I am experiencing a problem with the blocks::peak\_detector2 block. The simulation stalls after some time. My conjecture is that this is due to the kind the block handles its output in wo… --- ## [Uhd\_fft and other wx stuff does not work](https://www.ruby-forum.com/t/uhd-fft-and-other-wx-stuff-does-not-work/233641)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [December 31, 2014, 3:45pm UTC](https://www.ruby-forum.com/t/uhd-fft-and-other-wx-stuff-does-not-work/233641 "2014-12-31T15:45:00Z")
Hi, I installed gnuradio master from source on a Kubuntu 14.04 64 bit system, and it appears that all wxgui stuff does not work. What may be the issue here? Gnuradio and uhd build without error, without missing featu… --- ## [Fxpt\_nco vs rotator?](https://www.ruby-forum.com/t/fxpt-nco-vs-rotator/233647)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [December 31, 2014, 5:56am UTC](https://www.ruby-forum.com/t/fxpt-nco-vs-rotator/233647 "2014-12-31T05:56:09Z")
I’m experimenting with very fine frequency measurements (i.e. uHz resolution) at high sample rates. For instance, down-converting all the WWV signals from a 100 Msps chunk of HF spectrum to near 0 Hz then comparing t… --- ## [Re-building the source code](https://www.ruby-forum.com/t/re-building-the-source-code/233643)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 30, 2014, 6:14pm UTC](https://www.ruby-forum.com/t/re-building-the-source-code/233643 "2014-12-30T18:14:47Z")
Hi, I have changed things in udp\_source\_impl.cc, and I re-built the gnuradio as in the following instructions: cmake make sudo make install However, the changes that I did to udp\_source\_impl.cc did not work, it i… --- ## [BER over air](https://www.ruby-forum.com/t/ber-over-air/233575)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 15\ **Last updated:** [December 29, 2014, 2:24pm UTC](https://www.ruby-forum.com/t/ber-over-air/233575 "2014-12-29T14:24:32Z")
Hello all, BER (Bit Error Rate) measurement isn’t a cumbersome task which is realizable for each system with transmitting a known sequence of bits and take them @ a receiver which translates BER measurement into a si… --- ## [Gr::log :WARN: udp\_source0 - Too much data; dropping packet](https://www.ruby-forum.com/t/gr-log-udp-source0-too-much-data-dropping-packet/233598)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 28, 2014, 11:59am UTC](https://www.ruby-forum.com/t/gr-log-udp-source0-too-much-data-dropping-packet/233598 "2014-12-28T11:59:10Z")
Hi, I am writing a code where data is psk modulated in a host and then the modulated psk symbols are sent over udp to a remote host where a demodulator is setting. I am having troubles getting it to work. I have th… --- ## [Uhd newbee problem with B200+TCXO](https://www.ruby-forum.com/t/uhd-newbee-problem-with-b200-tcxo/233593)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 27, 2014, 5:59pm UTC](https://www.ruby-forum.com/t/uhd-newbee-problem-with-b200-tcxo/233593 "2014-12-27T17:59:38Z")
I have a new ettus B200 with TCXO (no antenna) plugged into my ZOTAC ZBOX USB3 port running Debian 7.7. I recently built gnuradio with the build-gnuradio script. I was trying to build a broadcast FM radio receiver f… --- ## [Python block help](https://www.ruby-forum.com/t/python-block-help/233561)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 27, 2014, 8:21am UTC](https://www.ruby-forum.com/t/python-block-help/233561 "2014-12-27T08:21:38Z")
Hi list, I am writing a custom python block that should take complex input, check magnitude of incoming samples and if the magnitude is greater than a threshold value, the block should pass that sample otherwise the b… --- ## [GNURadio scheduler behind the scene](https://www.ruby-forum.com/t/gnuradio-scheduler-behind-the-scene/233586)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [December 26, 2014, 9:48pm UTC](https://www.ruby-forum.com/t/gnuradio-scheduler-behind-the-scene/233586 "2014-12-26T21:48:09Z")
Season’s Greetings GNURadio community and happy new year 2015! I was having a thorough read through Tom R.'s presentation covering the gnuradio Scheduler Details, a big thanks Tom for clarifying the processes beh… --- ## [Efficient data transfer to co-processor (GPGPU using OpenCL)](https://www.ruby-forum.com/t/efficient-data-transfer-to-co-processor-gpgpu-using-opencl/233578)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 25, 2014, 5:08pm UTC](https://www.ruby-forum.com/t/efficient-data-transfer-to-co-processor-gpgpu-using-opencl/233578 "2014-12-25T17:08:19Z")
Hello, I am experimenting with OpenCL and need to create a GNU Radio processing block where all the computations will happen inside a discrete GPU. More precisely, I am writing an OpenCL implementation of the polyphas… --- ## [How To Change Tx Frequency During Transmission](https://www.ruby-forum.com/t/how-to-change-tx-frequency-during-transmission/233314)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [December 24, 2014, 10:19pm UTC](https://www.ruby-forum.com/t/how-to-change-tx-frequency-during-transmission/233314 "2014-12-24T22:19:05Z")
Hello everyone, Does anyone know how to change Tx frequency during transmission. I mean the transmitter operates at f0 GHz in some interval of time and then change to operate at f1 GHz. Sincerely, Van-Ly Van-Ly N… --- ## [UmTRX development kit seasonal sale and ClockTamer seasonal sale!](https://www.ruby-forum.com/t/umtrx-development-kit-seasonal-sale-and-clocktamer-seasonal-sale/233566)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 24, 2014, 9:24pm UTC](https://www.ruby-forum.com/t/umtrx-development-kit-seasonal-sale-and-clocktamer-seasonal-sale/233566 "2014-12-24T21:24:43Z")
Between Christmas and Chinese New Year the price of UmTRX v2.2 is dropped from $1500 to $850. Offer duration: Dec 24, 2014 – Feb 19, 2015 Availability for shipment: 40 pcs starting January, 2015 We hugely appreciat… --- ## [Build fails](https://www.ruby-forum.com/t/build-fails/233557)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [December 24, 2014, 4:05pm UTC](https://www.ruby-forum.com/t/build-fails/233557 "2014-12-24T16:05:15Z")
Hi all, With latest sources (after a git pull) the build fails. Kubuntu 14.04 32 bit, and a new gnuradio folder did not change things. Here the output: \[ 5%\] Building C object volk/lib/CMakeFiles/volk.dir/volk\_machi… --- ## [Help me help myself](https://www.ruby-forum.com/t/help-me-help-myself/233536)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 12\ **Last updated:** [December 24, 2014, 5:23am UTC](https://www.ruby-forum.com/t/help-me-help-myself/233536 "2014-12-24T05:23:51Z")
Hi all, The goal of this email is to learn how to find answers using available resources on my own in the future. To do this, I will explain what I’ve done to try and find the answer and then I hope someone can tell m… --- ## [DV Dongle - AMBE USB Device](https://www.ruby-forum.com/t/dv-dongle-ambe-usb-device/132284)
**Author:** [@Eric\_ASCottrell](https://www.ruby-forum.com/u/Eric_ASCottrell)\ **Replies:** 33\ **Last updated:** [December 23, 2014, 8:44pm UTC](https://www.ruby-forum.com/t/dv-dongle-ambe-usb-device/132284 "2014-12-23T20:44:29Z")
Hello, One of the “problems” with DStar and some other digital voice systems is the Patent and other IP considerations. DStar uses the AMBE codec which is owned by DVSI. Icom uses a DVSI AMBE2020 chip in their DStar … --- ## [Specest issue](https://www.ruby-forum.com/t/specest-issue/233550)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [December 23, 2014, 6:03pm UTC](https://www.ruby-forum.com/t/specest-issue/233550 "2014-12-23T18:03:11Z")
Dear All: OS: Ubuntu 14.01.1 gnu-radio: 3.7.6 Dell Optiplex 765 I want to use the moving\_average\_vff block from specest, which is not available in GRC. I tried installing gr-specest using pybombs (gnuradio wa… --- ## [Running a GNU Radio Companion generated code](https://www.ruby-forum.com/t/running-a-gnu-radio-companion-generated-code/233530)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [December 23, 2014, 9:12am UTC](https://www.ruby-forum.com/t/running-a-gnu-radio-companion-generated-code/233530 "2014-12-23T09:12:45Z")
Hi people, Sorry for the dummy question, but I didn’t find a simple and direct answer searching around for this. (Not need to say also that I am just starting with GNU Radio… :slight\_smile: OK I have a code, generate… --- ## [Doppler simulator](https://www.ruby-forum.com/t/doppler-simulator/233528)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [December 22, 2014, 1:24pm UTC](https://www.ruby-forum.com/t/doppler-simulator/233528 "2014-12-22T13:24:02Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [I need help](https://www.ruby-forum.com/t/i-need-help/233520)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 21, 2014, 11:01am UTC](https://www.ruby-forum.com/t/i-need-help/233520 "2014-12-21T11:01:08Z")
Hello every one !!! first of all warm good morning. i need your help once again . i have change my or ubuntu 12.04 LTS to 14.04 ubuntu and try to install gnuradio but not able to install i got such an error Process… --- ## [GRC Install - Pybombs vs Binaries](https://www.ruby-forum.com/t/grc-install-pybombs-vs-binaries/233510)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [December 20, 2014, 5:27pm UTC](https://www.ruby-forum.com/t/grc-install-pybombs-vs-binaries/233510 "2014-12-20T17:27:37Z")
Hello experts, I have been using linux and GRC for about a year and as such I am still pretty ‘green’ about a lot of stuff, but I am learning and hopefuly someone will be able to advise me about me questions. I use … --- ## [Gr-osmosdr + airspy random issue](https://www.ruby-forum.com/t/gr-osmosdr-airspy-random-issue/233513)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [December 20, 2014, 5:13pm UTC](https://www.ruby-forum.com/t/gr-osmosdr-airspy-random-issue/233513 "2014-12-20T17:13:26Z")
I use a airspy receiver with gr-osmosdr + gnuradio-companion. Randomly, when I stop gnuradio execution, the following execution freezes at startup (my QT GUI instruments are not displayed). And on the next start I hav… --- ## [Uhd\_fft not resonding](https://www.ruby-forum.com/t/uhd-fft-not-resonding/233500)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 9\ **Last updated:** [December 18, 2014, 9:33pm UTC](https://www.ruby-forum.com/t/uhd-fft-not-resonding/233500 "2014-12-18T21:33:39Z")
I’m using Ubuntu 14.04, UHD\_003.008.00-18-g864f84b5 and GNU Radio 3.7.6 Whenever I start uhd\_fft from a command line, the window opens and starts to plot. After about a second, the window goes into not responding mode… --- ## [Dev Call December](https://www.ruby-forum.com/t/dev-call-december/233501)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 18, 2014, 7:03pm UTC](https://www.ruby-forum.com/t/dev-call-december/233501 "2014-12-18T19:03:48Z")
Starting now, YT URL: GR Dev Call December 2014 - YouTube Ping me in #gnuradio if you want to join. Cheers, M --- ## [Connecting GNURadio to xilinx evaluation board](https://www.ruby-forum.com/t/connecting-gnuradio-to-xilinx-evaluation-board/233493)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [December 17, 2014, 9:12pm UTC](https://www.ruby-forum.com/t/connecting-gnuradio-to-xilinx-evaluation-board/233493 "2014-12-17T21:12:16Z")
Hi, I have KC705 evaluation board of xilinx: I have also a daughter board of fmcomms1: http://wiki.analog.com/resources/eval/user-guides/ad-fmcomms1-ebz I want to use GNURadio alongside of this board. I suddenly sa… --- ## [Vectors for GNU Radio Python Blocks](https://www.ruby-forum.com/t/vectors-for-gnu-radio-python-blocks/233492)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 17, 2014, 6:56pm UTC](https://www.ruby-forum.com/t/vectors-for-gnu-radio-python-blocks/233492 "2014-12-17T18:56:32Z")
Hi all, How do I write the init section for a Python block with an complex input vector of length v\_len, so I need to adapt the following… “def init(self, Nb, Ns, mapping, v\_len): gr.basic\_block.init(self, name=“Dem… --- ## [Trouble at OFDM modulation FFT waveform](https://www.ruby-forum.com/t/trouble-at-ofdm-modulation-fft-waveform/233491)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [December 17, 2014, 6:54pm UTC](https://www.ruby-forum.com/t/trouble-at-ofdm-modulation-fft-waveform/233491 "2014-12-17T18:54:41Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [How to pass time tag into usrp sink as a parameter ?\[hurry.\]](https://www.ruby-forum.com/t/how-to-pass-time-tag-into-usrp-sink-as-a-parameter-hurry/233473)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [December 17, 2014, 4:44pm UTC](https://www.ruby-forum.com/t/how-to-pass-time-tag-into-usrp-sink-as-a-parameter-hurry/233473 "2014-12-17T16:44:32Z")
Hello, I would like to implement the process as follows at the Rx side: Record the time when the first sample arrived, and then wait for a certain interval and then send ack back to Tx. Meanwhile, finish the cfo calc… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=39) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=41)