# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=81 [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:** 82 --- ## [Issue while installing GR 3.7](https://www.ruby-forum.com/t/issue-while-installing-gr-3-7/239297)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 14\ **Last updated:** [March 30, 2014, 7:51am UTC](https://www.ruby-forum.com/t/issue-while-installing-gr-3-7/239297 "2014-03-30T07:51:27Z")
Hello GR, While building GR 3.7 (clone it from GitHub - gnuradio/gnuradio: GNU Radio – the Free and Open Software Radio Ecosystem) on a Centos machine I got this error. In file included from /raid/nae/gnuradio-3.7/g… --- ## [How to uninstall gnuradio?](https://www.ruby-forum.com/t/how-to-uninstall-gnuradio/238749)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 7\ **Last updated:** [March 29, 2014, 12:14pm UTC](https://www.ruby-forum.com/t/how-to-uninstall-gnuradio/238749 "2014-03-29T12:14:55Z")
I installed using the build gnuradio script, how do I uninstall? Because I want to install another version. I’m new and I’m still a little lost. Thank you --- ## [Check The output of a block & input captured frames to GNURadio](https://www.ruby-forum.com/t/check-the-output-of-a-block-input-captured-frames-to-gnuradio/240125)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [March 29, 2014, 9:25am UTC](https://www.ruby-forum.com/t/check-the-output-of-a-block-input-captured-frames-to-gnuradio/240125 "2014-03-29T09:25:33Z")
I want to make a test and see the output , I put 3 blocks , vector source , throttle and vector sink . I edited the “vector” parameter in vector source block to (6,6). All 3 blocks have a type “byte”. I generated the… --- ## [Linking Gnuradio and Gpredict?](https://www.ruby-forum.com/t/linking-gnuradio-and-gpredict/245818)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 5\ **Last updated:** [March 28, 2014, 7:36pm UTC](https://www.ruby-forum.com/t/linking-gnuradio-and-gpredict/245818 "2014-03-28T19:36:03Z")
Is it possible to link Gnuradio and Gpredict ? I want to use Gpredict as tracker controlling the antenna position and to pass doppler corrected frequency data to Gnuradio. Does any interface to Gpredict (or hamlib) ex… --- ## [GIT checkout of Gnu Radio failed!](https://www.ruby-forum.com/t/git-checkout-of-gnu-radio-failed/240101)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 6\ **Last updated:** [March 28, 2014, 6:16pm UTC](https://www.ruby-forum.com/t/git-checkout-of-gnu-radio-failed/240101 "2014-03-28T18:16:01Z")
I am installing GNU Radio from this link : http://blogs.bu.edu/mhirsch/2012/07/installing-gnu-radio-in-ubuntu-12-04-x64/comment-page-1/ but I got this output in terminal : “This script will fetch Gnu Radio version 3.7… --- ## [Solution for SegFault with Lock / Unlock in 3.7 C++](https://www.ruby-forum.com/t/solution-for-segfault-with-lock-unlock-in-3-7-c/240123)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [March 28, 2014, 6:10pm UTC](https://www.ruby-forum.com/t/solution-for-segfault-with-lock-unlock-in-3-7-c/240123 "2014-03-28T18:10:45Z")
I was wondering if there has been any progress or work arounds for Bug 598 in 3.7? http://gnuradio.org/redmine/issues/598 The issue is the GnuRadio will segfault if there are too many Lock / Unlocks. I am having it… --- ## [Output operand requires a reduction, but reduction is not enabled](https://www.ruby-forum.com/t/output-operand-requires-a-reduction-but-reduction-is-not-enabled/239714)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [March 28, 2014, 12:38pm UTC](https://www.ruby-forum.com/t/output-operand-requires-a-reduction-but-reduction-is-not-enabled/239714 "2014-03-28T12:38:24Z")
Thanks Martin, this is clear and makes sense. I should have read the numpy data types more thoroughly and worked it out. Anyway… My collaborators are writing their Wireless Network Coding bits in Python. Once I get th… --- ## [Multiply block problem in GRC 3.6.5.1](https://www.ruby-forum.com/t/multiply-block-problem-in-grc-3-6-5-1/240107)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [March 28, 2014, 1:00am UTC](https://www.ruby-forum.com/t/multiply-block-problem-in-grc-3-6-5-1/240107 "2014-03-28T01:00:27Z")
Hello GRC community, I’m initiating with grc, trying to make a simple BASK. I searched a lot in the mailing list and in the tracker (I don’t know if it’s called that way) but I was unable to find anything about. It’… --- ## [Finding error: thread\[thread-per-block\[357\]: \\]: std::bad\_alloc](https://www.ruby-forum.com/t/finding-error-thread-thread-per-block-357-block-queue-sink-4-std-bad-alloc/240093)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [March 27, 2014, 10:28pm UTC](https://www.ruby-forum.com/t/finding-error-thread-thread-per-block-357-block-queue-sink-4-std-bad-alloc/240093 "2014-03-27T22:28:36Z")
Dear Gnuradio Community, I ran my GNURADIO program and got the following error message: thread\[thread-per-block\[357\]: \\]: std::bad\_alloc This looks like a memory allocation problem with the schedu… --- ## [Help with video link](https://www.ruby-forum.com/t/help-with-video-link/240080)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [March 27, 2014, 4:48pm UTC](https://www.ruby-forum.com/t/help-with-video-link/240080 "2014-03-27T16:48:04Z")
Hello all, I am completely stumped with trying to stream video using gnu radio (GRC) and the USRP. I have been at it for an absurdly long time without success. I could really use some help. (With Unbuntu and the lat… --- ## [Is a bug about stream\_mux block?](https://www.ruby-forum.com/t/is-a-bug-about-stream-mux-block/240047)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [March 27, 2014, 2:26pm UTC](https://www.ruby-forum.com/t/is-a-bug-about-stream-mux-block/240047 "2014-03-27T14:26:50Z")
Hi Experts, As follow is my program to test stream\_mux block. I found when dat1\_num+dat2\_num \> 8192, the result was wrong. Is there something I have made a mistake? My gnuradio version is v3.7.4git-35-g1092e685 #!/u… --- ## [Re: Mixing two signals for Radar application](https://www.ruby-forum.com/t/re-mixing-two-signals-for-radar-application/240096)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [March 27, 2014, 2:17pm UTC](https://www.ruby-forum.com/t/re-mixing-two-signals-for-radar-application/240096 "2014-03-27T14:17:59Z")
Hi Marcus,here is the flow graph and the output signals with movement across the antennae and without.http://tinypic.com/r/a5et5k/8 (GRC flow)http://tinypic.com/r/nbeq0k/8 (without movement)http://tinypic.com/r/2s7d… --- ## [Imcompatibility between GRC version and the USRP FW](https://www.ruby-forum.com/t/imcompatibility-between-grc-version-and-the-usrp-fw/240090)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [March 27, 2014, 11:51am UTC](https://www.ruby-forum.com/t/imcompatibility-between-grc-version-and-the-usrp-fw/240090 "2014-03-27T11:51:57Z")
HI I am presently trying to work with USRP N210 with a SBX daughter board connected to a Host laptop with Ubuntu 12.10 installed.This laptop had a version of GRC and UHD installed when I got it. But even though I was… --- ## [Newbie GNUradio: displaying received Signal RSSI](https://www.ruby-forum.com/t/newbie-gnuradio-displaying-received-signal-rssi/240098)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [March 27, 2014, 11:50am UTC](https://www.ruby-forum.com/t/newbie-gnuradio-displaying-received-signal-rssi/240098 "2014-03-27T11:50:25Z")
Hello Experts, first of all I would like to know what RSSI actually is and if it is possible to calculate/display the Received Signal RSSI using USRP block in GNUradio over Ubuntu 13.10. 2nd: I have connected the wat… --- ## [Mixing two signals for Radar application](https://www.ruby-forum.com/t/mixing-two-signals-for-radar-application/240079)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [March 27, 2014, 9:57am UTC](https://www.ruby-forum.com/t/mixing-two-signals-for-radar-application/240079 "2014-03-27T09:57:14Z")
Hi list, I am in the process of building an FMCW radar. For this to work, I have to mix two signals. I tried to do it with the “multiply” block but no luck. I tried then to see how exactly this block works. It seems … --- ## [Error with gr-lte in vector\_to\_streams\_make()](https://www.ruby-forum.com/t/error-with-gr-lte-in-vector-to-streams-make/239640)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [March 27, 2014, 5:20am UTC](https://www.ruby-forum.com/t/error-with-gr-lte-in-vector-to-streams-make/239640 "2014-03-27T05:20:37Z")
Hi everybody, I installed gr-lte with pybombs and when I launch the flow, I get this error : File “/home/winston/target/lib/python2.7/dist-packages/lte/bch\_viterby\_vfvb.py”, line 42, in init self.vtss = blocks.vect… --- ## [Gr-lte](https://www.ruby-forum.com/t/gr-lte/238004)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [March 27, 2014, 5:19am UTC](https://www.ruby-forum.com/t/gr-lte/238004 "2014-03-27T05:19:15Z")
Hi Johannes, I have compiled the gr-lte-gr37/gr37-lte branch successfully. Now I see a lot of python files and also grc-files in 37grc, but I dont’ now how can I start your LTE receiver application. I can generate th… --- ## [How to capture video frame over the air](https://www.ruby-forum.com/t/how-to-capture-video-frame-over-the-air/240084)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [March 27, 2014, 4:01am UTC](https://www.ruby-forum.com/t/how-to-capture-video-frame-over-the-air/240084 "2014-03-27T04:01:17Z")
Hello GR, I tried to capture some TV broadcast video frames using rx\_samples\_to\_file --args “addr=myusrp” --file myfile.dat --time 120 –freq 450.75e6 --rate 5e6 --gain 30 Then I tried to play back that file using : … --- ## [PSK File transfer](https://www.ruby-forum.com/t/psk-file-transfer/240068)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 6\ **Last updated:** [March 27, 2014, 1:43am UTC](https://www.ruby-forum.com/t/psk-file-transfer/240068 "2014-03-27T01:43:42Z")
Hello, I’m trying to do a simple file transfer over PSK, but the text file I get on the output is garbled. I’ve got: file source -\> throttle -\> psk(4) mod -\> psk(4) demod -\> pack K (8) bits -\> file sink If I put i… --- ## [Re: Gnuradio binaries dependencies / conflict - build uhd\_003.007.000-1-stable\_Ubuntu-12.04-x86\_64 g](https://www.ruby-forum.com/t/re-gnuradio-binaries-dependencies-conflict-build-uhd-003-007-000-1-stable-ubuntu-12-04-x86-64-g/240088)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [March 26, 2014, 10:24pm UTC](https://www.ruby-forum.com/t/re-gnuradio-binaries-dependencies-conflict-build-uhd-003-007-000-1-stable-ubuntu-12-04-x86-64-g/240088 "2014-03-26T22:24:53Z")
32 bits programs, with ia32-libs. It seems that I have to start on a fresh untouched Ubuntu installation, Hi Martin, I will try this pybomb that was presented at Orconf. Last time that I installed gnuradio, it was … --- ## [Performance drop with upgrade to 3.7](https://www.ruby-forum.com/t/performance-drop-with-upgrade-to-3-7/240009)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [March 26, 2014, 5:40pm UTC](https://www.ruby-forum.com/t/performance-drop-with-upgrade-to-3-7/240009 "2014-03-26T17:40:35Z")
Hi - I just upgraded to 3.7.3 using the build-gnuradio script from 3.6.5.1. I am using it to run a C++ App that captures all the radio communications on a Moto SmartNet system. I upgraded all my code to work with the… --- ## [Pybombs and FAT32](https://www.ruby-forum.com/t/pybombs-and-fat32/239985)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [March 26, 2014, 4:58pm UTC](https://www.ruby-forum.com/t/pybombs-and-fat32/239985 "2014-03-26T16:58:48Z")
I am a bit short of disk space on my laptop, which is dual boot with a 128Gbyte SSD with only 10GBytes devoted exclusively to Linux. Pybombs installation of Gnuradio has now grown to use over 5 GBytes so I though why … --- ## [802.15.4 transmitted signal structure](https://www.ruby-forum.com/t/802-15-4-transmitted-signal-structure/240053)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [March 26, 2014, 3:25pm UTC](https://www.ruby-forum.com/t/802-15-4-transmitted-signal-structure/240053 "2014-03-26T15:25:09Z")
Hello GR, Is there any one who has monitored the signal generated by transceiver.py related to the 802.15.4 implementation. I want to understand the meaning its structure. I find out that it consist of a bursty tra… --- ## [Received power measurement](https://www.ruby-forum.com/t/received-power-measurement/240070)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [March 26, 2014, 1:52pm UTC](https://www.ruby-forum.com/t/received-power-measurement/240070 "2014-03-26T13:52:05Z")
Hi all, I need to know if there is any method to measure the received signal power using USRP N210. I am using gr\_probe\_avg\_mag\_sqrd\_x\_0 to measure the signal strength, however, the results are not accurate. Thanks --- ## [Problem installing gnuradio and op25 using pybombs](https://www.ruby-forum.com/t/problem-installing-gnuradio-and-op25-using-pybombs/240072)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [March 26, 2014, 12:42pm UTC](https://www.ruby-forum.com/t/problem-installing-gnuradio-and-op25-using-pybombs/240072 "2014-03-26T12:42:03Z")
i\`m trying to install op25 using pybombs and i faced some errors, here is the script. \[ 30%\] Built target pygen\_gr\_digital\_swig\_2165f Scanning dependencies of target pygen\_gr\_atsc\_swig\_1e8f8 \[ 30%\] Generating atsc\_sw… --- ## [Flowgraph reading keystrokes during execution](https://www.ruby-forum.com/t/flowgraph-reading-keystrokes-during-execution/240061)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [March 26, 2014, 12:08pm UTC](https://www.ruby-forum.com/t/flowgraph-reading-keystrokes-during-execution/240061 "2014-03-26T12:08:29Z")
Dear Sir, I am thinking of building simple chat application using gnuradio. PC#1 connecting to USRP#1, will send text message to PC#2 via USRP#2. The question is, how to get the user keystrokes from the flowgraph at … --- ## [Std::cin inside work()](https://www.ruby-forum.com/t/std-cin-inside-work/240069)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [March 26, 2014, 11:58am UTC](https://www.ruby-forum.com/t/std-cin-inside-work/240069 "2014-03-26T11:58:31Z")
Dear sir, Why below custom block doesn’t work…? int console1\_impl::work( int noutput\_items, gr\_vector\_const\_void\_star &input\_items, gr\_vector\_void\_star &output\_items) { int \*out = (int… --- ## [Gnuradio binaries dependencies / conflict - build uhd\_003.007.000-1-stable\_Ubuntu-12.04-x86\_64 gnura](https://www.ruby-forum.com/t/gnuradio-binaries-dependencies-conflict-build-uhd-003-007-000-1-stable-ubuntu-12-04-x86-64-gnura/240055)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [March 26, 2014, 10:58am UTC](https://www.ruby-forum.com/t/gnuradio-binaries-dependencies-conflict-build-uhd-003-007-000-1-stable-ubuntu-12-04-x86-64-gnura/240055 "2014-03-26T10:58:16Z")
Hi gnuradio guys, I just tried to install gnuradio binaries from Ettus stable build: http://files.ettus.com/binaries/gnuradio/gnuradio-stable\_2014-02-25/ My OS is Ubuntu 12.04.4 LTS / x86\_64. In order to be able usin… --- ## [Command terminated by signal 11](https://www.ruby-forum.com/t/command-terminated-by-signal-11/240064)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [March 26, 2014, 10:49am UTC](https://www.ruby-forum.com/t/command-terminated-by-signal-11/240064 "2014-03-26T10:49:29Z")
Hello I am running my code in Python using Gnuradio and USRPs. The program is supposed to work continuously till an interrupt is given. The code works well for 10-15 iterations and then terminates stating “command te… --- ## [SNR estimator block output problem](https://www.ruby-forum.com/t/snr-estimator-block-output-problem/239859)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [March 25, 2014, 10:52pm UTC](https://www.ruby-forum.com/t/snr-estimator-block-output-problem/239859 "2014-03-25T22:52:59Z")
Hi all, I try to create a new block able to generate integer values depending on the output values giving by the SNR estimator block (already available in Gnuradio library). Normally the estimator black should give t… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=80) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=82)