# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=39 [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:** 40 --- ## [Issue with Virtual Sink/Source](https://www.ruby-forum.com/t/issue-with-virtual-sink-source/233712)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [January 13, 2015, 2:18pm UTC](https://www.ruby-forum.com/t/issue-with-virtual-sink-source/233712 "2015-01-13T14:18:19Z")
Hi, We recently bought a new PC with some powerful specs. GNU Radio was built from the source and it seems to be installed fine. However, when I try to use the virtual sink and source blocks in my flow graph, I am g… --- ## [Re: U's and L's when running GNU Radio](https://www.ruby-forum.com/t/re-us-and-ls-when-running-gnu-radio/233790)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 12, 2015, 7:09pm UTC](https://www.ruby-forum.com/t/re-us-and-ls-when-running-gnu-radio/233790 "2015-01-12T19:09:14Z")
Hi Marcus, Hi Sylvain, Thank you for your response. I continue to get these ULLLLLLLLLLLLLLLL even on a PC with really high specs. Please find below my answers to your questions. Do you use timed\_commands? Yes, … --- ## [Request for volunteers: CGRAN Task Force (aka the PyBOMB Squad)](https://www.ruby-forum.com/t/request-for-volunteers-cgran-task-force-aka-the-pybomb-squad/233711)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [January 12, 2015, 7:05pm UTC](https://www.ruby-forum.com/t/request-for-volunteers-cgran-task-force-aka-the-pybomb-squad/233711 "2015-01-12T19:05:39Z")
Hey Everyone, and a happy new year! I hope you all had a great holiday break (if you had one), and maybe the one or the other of you had some time to hack GNU Radio stuff. Maybe that made you curious what 2015 will b… --- ## [VOLK WG January call](https://www.ruby-forum.com/t/volk-wg-january-call/233730)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 12, 2015, 6:59pm UTC](https://www.ruby-forum.com/t/volk-wg-january-call/233730 "2015-01-12T18:59:04Z")
VOLK people, It’s time to schedule the next VOLK WG call. Enter availabilities here: WhenIsGood: VOLK WG January Agenda link will be posted when a date is picked. For now the planned topics include: planning the sp… --- ## [B210 overflows and huge usb buffer](https://www.ruby-forum.com/t/b210-overflows-and-huge-usb-buffer/233785)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [January 12, 2015, 6:24pm UTC](https://www.ruby-forum.com/t/b210-overflows-and-huge-usb-buffer/233785 "2015-01-12T18:24:21Z")
Hi, Now that the b210 timing issue now solved (thanks to Ian and Balint!), I’m trying to get samples to disk at about 50 MHz. I have more than the required bandwidth on the disk, but there are occasional I/O hiccups. … --- ## [Error in Python file generated by GnuRadio Companion](https://www.ruby-forum.com/t/error-in-python-file-generated-by-gnuradio-companion/234885)
**Author:** [@alcina](https://www.ruby-forum.com/u/alcina)\ **Replies:** 6\ **Last updated:** [January 12, 2015, 5:04pm UTC](https://www.ruby-forum.com/t/error-in-python-file-generated-by-gnuradio-companion/234885 "2015-01-12T17:04:10Z")
Hello, I have created My QPSK Demodulator following tutorial 4: https://gnuradio.org/redmine/projects/gnuradio/wiki/Guided\_Tutorial\_GNU\_Radio\_in\_C++ My source files (C++, XML) look exactly like those in the repository… --- ## [Re: Gr-Specest: window not passed? \[Solved\]](https://www.ruby-forum.com/t/re-gr-specest-window-not-passed-solved/233792)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 12, 2015, 3:48pm UTC](https://www.ruby-forum.com/t/re-gr-specest-window-not-passed-solved/233792 "2015-01-12T15:48:46Z")
Hi List, I got the error: welch\_impl.cc:83 std::vector window shadows the variable with the same name (l. 81), albeit uninitialized, outside the if case. I will provide a pull request tonight. Best regards Stephan … --- ## [Gr-Specest: window not passed?](https://www.ruby-forum.com/t/gr-specest-window-not-passed/233789)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 12, 2015, 3:18pm UTC](https://www.ruby-forum.com/t/gr-specest-window-not-passed/233789 "2015-01-12T15:18:17Z")
Hello Moritz, Hello List, I might have found some unintended behaviour in gr-specest. I claim that the content of const std::vector &window is not passed in the constructor, if called by the GRC block. I cannot expla… --- ## [Proposed Offline Tools: Header Generation, File Manipulation and Format Conversion](https://www.ruby-forum.com/t/proposed-offline-tools-header-generation-file-manipulation-and-format-conversion/233788)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 12, 2015, 3:09pm UTC](https://www.ruby-forum.com/t/proposed-offline-tools-header-generation-file-manipulation-and-format-conversion/233788 "2015-01-12T15:09:20Z")
To use GNURadio as a data analysis platform, I’ve been developing a few tools which I think will be useful for the general community. These are primarily Python/command line tools intended to manipulate prerecorded f… --- ## [\[ANN\] GNU Radio 3.7.6, 3.7.5.2, and Live SDR Environment released](https://www.ruby-forum.com/t/ann-gnu-radio-3-7-6-3-7-5-2-and-live-sdr-environment-released/233784)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 12, 2015, 5:48am UTC](https://www.ruby-forum.com/t/ann-gnu-radio-3-7-6-3-7-5-2-and-live-sdr-environment-released/233784 "2015-01-12T05:48:56Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Grc missing cmake files?](https://www.ruby-forum.com/t/grc-missing-cmake-files/233364)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 12, 2015, 1:40am UTC](https://www.ruby-forum.com/t/grc-missing-cmake-files/233364 "2015-01-12T01:40:14Z")
Hi guys, I have just installed a fresh GRC via pybombs. I want to install the sdrangelove from osmocom.org and when I run the cmake …/ it returns an error stating: CMake Error at CMakeLists.txt:151 (find\_package): … --- ## [Gr-fosphor error under GNU Radio Companion 3.7.6](https://www.ruby-forum.com/t/gr-fosphor-error-under-gnu-radio-companion-3-7-6/233783)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 11, 2015, 10:17pm UTC](https://www.ruby-forum.com/t/gr-fosphor-error-under-gnu-radio-companion-3-7-6/233783 "2015-01-11T22:17:02Z")
Hello, I got my hands on a computer with a video card and decided to try out gr-fosphor. Managed to compile and install but when trying to run it i get this error below and will appreciate any light on how to move fwd … --- ## [Compiling GNURadio on BananaPI](https://www.ruby-forum.com/t/compiling-gnuradio-on-bananapi/233762)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 9\ **Last updated:** [January 11, 2015, 6:37pm UTC](https://www.ruby-forum.com/t/compiling-gnuradio-on-bananapi/233762 "2015-01-11T18:37:13Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [GNU Radio && Stack Overflow](https://www.ruby-forum.com/t/gnu-radio-stack-overflow/233744)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 8, 2015, 12:25pm UTC](https://www.ruby-forum.com/t/gnu-radio-stack-overflow/233744 "2015-01-08T12:25:00Z")
Everyone, we’re in an interesting spot community-wise right now, which should be clear to people who’ve been around here for a while, and definitely to everyone at GRCon last year. While we’re still a smallish free so… --- ## [Locking TopBlock stops WavFile-Sink](https://www.ruby-forum.com/t/locking-topblock-stops-wavfile-sink/233703)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [January 8, 2015, 3:51am UTC](https://www.ruby-forum.com/t/locking-topblock-stops-wavfile-sink/233703 "2015-01-08T03:51:29Z")
It looks like there is an issue where locking/unlocking the TopBlock causes WavFile-Sink to stop recording. A plain File-Sink does not have this problem. This problem is new to 3.7 and didn’t exist in 3.6. Is this the… --- ## [Fwd: Upper Sideband Demodulation](https://www.ruby-forum.com/t/fwd-upper-sideband-demodulation/233721)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [January 8, 2015, 1:44am UTC](https://www.ruby-forum.com/t/fwd-upper-sideband-demodulation/233721 "2015-01-08T01:44:11Z")
Hi everyone, I have a question regarding the USB demodulation which I have conducted on a sample wav file which I have recorded. I would like to know if there are any solutions to eliminate the audio underrun issue w… --- ## [IEEE Signal Intelligence Challenge -- Recap and Preview](https://www.ruby-forum.com/t/ieee-signal-intelligence-challenge-recap-and-preview/233427)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 7, 2015, 3:52pm UTC](https://www.ruby-forum.com/t/ieee-signal-intelligence-challenge-recap-and-preview/233427 "2015-01-07T15:52:19Z")
Everyone, in 2014, the IEEE Student Branch Karlsruhe organized a signal intelligence challenge for students. I had promised to send a recap to this list, but completely forgotten about it – however, this does mean th… --- ## [Gr\_modtool rename option](https://www.ruby-forum.com/t/gr-modtool-rename-option/233740)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 7, 2015, 3:51pm UTC](https://www.ruby-forum.com/t/gr-modtool-rename-option/233740 "2015-01-07T15:51:05Z")
\-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hey list, I missed an option to rename a block I once created via modtool. Thus I coded it. You can find it on github \[1\]. It is supposed to go through all the created f… --- ## [CentOS pymbombs install](https://www.ruby-forum.com/t/centos-pymbombs-install/233736)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 11\ **Last updated:** [January 7, 2015, 3:32pm UTC](https://www.ruby-forum.com/t/centos-pymbombs-install/233736 "2015-01-07T15:32:22Z")
I’ve been running into difficulties using pybombs on my CentOS machine. I was told many users in the community use CentOS successfully so I’m looking to you for guidance. I am following the pybombs install instructio… --- ## [U's and L's when running GNU Radio](https://www.ruby-forum.com/t/us-and-ls-when-running-gnu-radio/233710)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 7, 2015, 3:24pm UTC](https://www.ruby-forum.com/t/us-and-ls-when-running-gnu-radio/233710 "2015-01-07T15:24:16Z")
Hi, In the terminal and while using a powerful PC (please see the attachment), I am occasionally getting capital U’s and L’s when running GNU Radio with one Tx and 4 Rx channels (Here is a sample of what I am gettin… --- ## [Max Output Power from the LFTX daughterboard](https://www.ruby-forum.com/t/max-output-power-from-the-lftx-daughterboard/233728)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 6, 2015, 2:49pm UTC](https://www.ruby-forum.com/t/max-output-power-from-the-lftx-daughterboard/233728 "2015-01-06T14:49:13Z")
Hi, What is the maximum output power from the LFTX daughterboard when used with the USRP N200? According to this datasheet \[1\], the N200 with the WBX daughterbaord provide an output power of 15 dBm. However, when us… --- ## [Uhd\_fft differences with different wire-format](https://www.ruby-forum.com/t/uhd-fft-differences-with-different-wire-format/233717)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [January 5, 2015, 9:11pm UTC](https://www.ruby-forum.com/t/uhd-fft-differences-with-different-wire-format/233717 "2015-01-05T21:11:16Z")
Hi all, I’m trying to understand the impact that changing the wire-format of a USRP has on the uhd\_fft script provided by GNURadio. Using UHD\_003.008.001-42-g8c87a524 and GNURadio built by pybomb a few weeks ago (342… --- ## [Slow GUI in GRC](https://www.ruby-forum.com/t/slow-gui-in-grc/233651)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [January 5, 2015, 5:27pm UTC](https://www.ruby-forum.com/t/slow-gui-in-grc/233651 "2015-01-05T17:27:15Z")
Hi, We recently bought a new machine with like 4 GHz processor, 16 GB of RAM. For the graphic card, we use the Radeon R7 250 1000 MHz GDDR5. Latest version of Ubuntu (14.04 LTS) was installed along with GNU Radio bu… --- ## [Question on threshold mathematics in correlate\_and\_sync block](https://www.ruby-forum.com/t/question-on-threshold-mathematics-in-correlate-and-sync-block/233652)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 11\ **Last updated:** [January 5, 2015, 3:33pm UTC](https://www.ruby-forum.com/t/question-on-threshold-mathematics-in-correlate-and-sync-block/233652 "2015-01-05T15:33:41Z")
Hi. Can someone give me a brief clue about the threshold testing in the correlate\_and\_sync block? In the constructor: for(size\_t i=0; i \< d\_symbols.size(); i++) corr += abs(d\_symbols\[i\]\*conj(d\_symbols\[i\])); d… --- ## [OFDM mod-demod](https://www.ruby-forum.com/t/ofdm-mod-demod/233702)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 5, 2015, 1:18pm UTC](https://www.ruby-forum.com/t/ofdm-mod-demod/233702 "2015-01-05T13:18:20Z")
hi I was doing OFDM modulation demodulation in following way file source —\> OFDM Mod —\> Virtual Source Virtual Sink —\> OFDM demod —\> File sink File source out is given in byte format. This system give output for bp… --- ## [Peak\_Detector2 stalls simulation](https://www.ruby-forum.com/t/peak-detector2-stalls-simulation/233678)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 5, 2015, 10:52am UTC](https://www.ruby-forum.com/t/peak-detector2-stalls-simulation/233678 "2015-01-05T10:52:37Z")
Stephan, We have worked with this block and realized it has a bug (not just an inefficient functionality). This is easy to see if you consider what happens when the first time work is called, the threshold is passed… --- ## [Rewrite rx\_time tag in tagged\_file\_sink](https://www.ruby-forum.com/t/rewrite-rx-time-tag-in-tagged-file-sink/233696)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 5, 2015, 8:18am UTC](https://www.ruby-forum.com/t/rewrite-rx-time-tag-in-tagged-file-sink/233696 "2015-01-05T08:18:24Z")
Hello list, What would be a good approach to rewrite the rx\_time tag in tagged\_file\_sink with my own information?? I am triggering a burst tagger wit a power squelch. What I want to get is timestamp information and c… --- ## [Getting time each time power squelch is on](https://www.ruby-forum.com/t/getting-time-each-time-power-squelch-is-on/233676)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [January 5, 2015, 2:29am UTC](https://www.ruby-forum.com/t/getting-time-each-time-power-squelch-is-on/233676 "2015-01-05T02:29:57Z")
Hello, I have a Python handcoded block in which I want every time that power squelch is triggered, grab the actual time and then use that filename to write a wav file with a decoded stream. What would be a good appro… --- ## [SWIG 3.0.3 Issue](https://www.ruby-forum.com/t/swig-3-0-3-issue/233648)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [January 4, 2015, 9:04pm UTC](https://www.ruby-forum.com/t/swig-3-0-3-issue/233648 "2015-01-04T21:04:12Z")
SWIG 3.0.3 was released today (30 Dec 2014) \< http://www.swig.org/ \>, and I maintain this port in MacPorts. So, I naturally was curious to see if it works with GNU Radio. Sadly, GNU Radio fails because some of the SWI… --- ## [Optional port in grc block](https://www.ruby-forum.com/t/optional-port-in-grc-block/233671)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 4, 2015, 5:59pm UTC](https://www.ruby-forum.com/t/optional-port-in-grc-block/233671 "2015-01-04T17:59:52Z")
Hi all, I would like to have grc block with a bool option “Debug”. Once this is set to True, then I would like to have an additional output port. How do I do that? I already added this part in the xml file: … [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=38) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=40)