# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=32 [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:** 33 --- ## [Reed-Solomon en/decoder](https://www.ruby-forum.com/t/reed-solomon-en-decoder/234510)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 9\ **Last updated:** [March 12, 2015, 7:16am UTC](https://www.ruby-forum.com/t/reed-solomon-en-decoder/234510 "2015-03-12T07:16:45Z")
I need Reed-Solomon encoder and decoder to perform RS(15, 2/4/7/11). I found that there are RS codes in gr-fec/lib/reed-solomon. But, I couldn’t find some grc blocks implementing the library codes. In addition, I don… --- ## [Extracting and storing certain parameters from continuous IQ data](https://www.ruby-forum.com/t/extracting-and-storing-certain-parameters-from-continuous-iq-data/234535)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [March 11, 2015, 11:03pm UTC](https://www.ruby-forum.com/t/extracting-and-storing-certain-parameters-from-continuous-iq-data/234535 "2015-03-11T23:03:16Z")
Hello everyone, So I was trying to capture continuous IQ data from my USRP N200, and this needs to be done for about a week, but because the amount of data is ginormous, that’s doesn’t seem feasible at all. Instead, … --- ## [Decimation of multiple streams](https://www.ruby-forum.com/t/decimation-of-multiple-streams/234470)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 11, 2015, 10:07pm UTC](https://www.ruby-forum.com/t/decimation-of-multiple-streams/234470 "2015-03-11T22:07:52Z")
Hey guys, I just had a quick question; if we have multiple streams that need to be decimated, is there a fast way to go about doing that in GNURadio Companion? How would you do it? Here’s a picture of my flow graph: h… --- ## [Frame Synchronization](https://www.ruby-forum.com/t/frame-synchronization/234531)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 11, 2015, 9:17pm UTC](https://www.ruby-forum.com/t/frame-synchronization/234531 "2015-03-11T21:17:02Z")
Hello, I’m trying to detect the start of a frame after demodulation. To do this, I’m using the ‘correlate access code - tag’ block. I want a tag to be placed at the end of the prbs used to frame sync so subsequent bl… --- ## [Formatter callback in QT QUI Label widget](https://www.ruby-forum.com/t/formatter-callback-in-qt-qui-label-widget/234520)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 11, 2015, 4:29pm UTC](https://www.ruby-forum.com/t/formatter-callback-in-qt-qui-label-widget/234520 "2015-03-11T16:29:50Z")
Does the formatter callback work? I can’t get it to do anything useful, using a lambda expression stuffed into a variable. How does the widget calll the desired function? --- ## [Regarding OFDM demodulation](https://www.ruby-forum.com/t/regarding-ofdm-demodulation/234523)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 11, 2015, 8:41am UTC](https://www.ruby-forum.com/t/regarding-ofdm-demodulation/234523 "2015-03-11T08:41:45Z")
Hello sir, I connect OFDM simple block diagram as shown below.I got OFDM Modulated output but unable to get OFDM Demodulated output.Will you please suggest me any solution for this. Thank you Sir. --- ## [GRC application tool is not opening](https://www.ruby-forum.com/t/grc-application-tool-is-not-opening/234522)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 11, 2015, 8:34am UTC](https://www.ruby-forum.com/t/grc-application-tool-is-not-opening/234522 "2015-03-11T08:34:11Z")
Hey Marcus, You told me to remove previous installation and then install it from the source, but after installation my GRC application tool was not opening. Even i tried pybombs for installing Gnuradio but again same … --- ## [Fwd: Ais\_rx](https://www.ruby-forum.com/t/fwd-ais-rx/234513)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 10, 2015, 2:55pm UTC](https://www.ruby-forum.com/t/fwd-ais-rx/234513 "2015-03-10T14:55:49Z")
\---------- Forwarded message ---------- From: Vladimir M. removed\_email\_address@domain.invalid Date: 2015-03-08 13:26 GMT+02:00 Subject: Re: \[Discuss-gnuradio\] Ais\_rx To: Nick F. ‫‎removed\_email\_address@domain.invali… --- ## [CMAKE GNU Radio 3.7.4 - gr-zeromq disabled](https://www.ruby-forum.com/t/cmake-gnu-radio-3-7-4-gr-zeromq-disabled/234505)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 9, 2015, 10:41pm UTC](https://www.ruby-forum.com/t/cmake-gnu-radio-3-7-4-gr-zeromq-disabled/234505 "2015-03-09T22:41:07Z")
Hello, i want to configure my GNUradio 3.7.4 by using this command cd /usr/local/src tar -zxf gnuradio-3.7.4.tar.gz cd gnuradio-3.7.4 mkdir build cd build cmake -DENABLE\_BAD\_BOOST=ON …/ make make test make inst… --- ## [Squelch\_base\_cc.h not installed](https://www.ruby-forum.com/t/squelch-base-cc-h-not-installed/234497)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 9, 2015, 3:43pm UTC](https://www.ruby-forum.com/t/squelch-base-cc-h-not-installed/234497 "2015-03-09T15:43:27Z")
I am trying to use the Power Squelch CC, but when I go to compile I get the following error: /opt/local/include/gnuradio/analog/pwr\_squelch\_cc.h:27:10: fatal error: ‘gnuradio/analog/squelch\_base\_cc.h’ file not found … --- ## [Error: make test failed](https://www.ruby-forum.com/t/error-make-test-failed/234490)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 9, 2015, 3:30pm UTC](https://www.ruby-forum.com/t/error-make-test-failed/234490 "2015-03-09T15:30:05Z")
Hey, while building source file of GNU radio following error occurred during “make test” 97% tests passed, 3 tests failed out of 87 Total Test time (real) = 45.81 sec The following tests FAILED: 80 - qa\_fecapi\_rep… --- ## [Rror: GNURADIO filter not found, while making own custom block in gnuradio and Getting error: No mod](https://www.ruby-forum.com/t/rror-gnuradio-filter-not-found-while-making-own-custom-block-in-gnuradio-and-getting-error-no-mod/234487)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 8, 2015, 7:50pm UTC](https://www.ruby-forum.com/t/rror-gnuradio-filter-not-found-while-making-own-custom-block-in-gnuradio-and-getting-error-no-mod/234487 "2015-03-08T19:50:32Z")
hey Marcus, Sorry,actually that was my first message, and there is some problem, hence i am not able reply through mail archive These are the 2 previous links : http://permalink.gmane.org/gmane.comp.gnu.radio.genera… --- ## [Volk issues on 32-bit hardware?](https://www.ruby-forum.com/t/volk-issues-on-32-bit-hardware/234482)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 8, 2015, 6:21pm UTC](https://www.ruby-forum.com/t/volk-issues-on-32-bit-hardware/234482 "2015-03-08T18:21:38Z")
I’ve a user who’s trying to install my simple\_ra code. It builds just fine, but upon running, runs into a linker error involving VOLK: raceback (most recent call last): File “/home/peter/bin/simple\_ra\_receiver.py”, l… --- ## [Error: GNURADIO filter not found, while making own custom block in gnuradio](https://www.ruby-forum.com/t/error-gnuradio-filter-not-found-while-making-own-custom-block-in-gnuradio/234472)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 8, 2015, 3:48pm UTC](https://www.ruby-forum.com/t/error-gnuradio-filter-not-found-while-making-own-custom-block-in-gnuradio/234472 "2015-03-08T15:48:43Z")
While making own custom block “derivative\_ff” using method specified in " https://gnuradio.org/redmine/projects/gnuradio/wiki/OutOfTreeModulesConfig" on Gnuradio 3.7.3 and for OS ubuntu 4.10, following error struck me … --- ## [Getting error: No module named howto\_swig](https://www.ruby-forum.com/t/getting-error-no-module-named-howto-swig/234479)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 7, 2015, 10:43pm UTC](https://www.ruby-forum.com/t/getting-error-no-module-named-howto-swig/234479 "2015-03-07T22:43:45Z")
while building own custom block “square\_ff” for Gnuradio 3.7.3, my make test command was not successful. After checking in detail for the error with command “ctest -V -R square”, i got an error of “No module named how… --- ## [Decoding Morse code](https://www.ruby-forum.com/t/decoding-morse-code/234468)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [March 7, 2015, 1:30am UTC](https://www.ruby-forum.com/t/decoding-morse-code/234468 "2015-03-07T01:30:55Z")
A few weeks ago I started learning my way around gnuradio and am making progress, but could use advice from experienced users. I’ve been making something of an online lab notebook recording my efforts in gnuradio at: … --- ## [PSD in dBm/Hz](https://www.ruby-forum.com/t/psd-in-dbm-hz/234449)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 7\ **Last updated:** [March 6, 2015, 4:34pm UTC](https://www.ruby-forum.com/t/psd-in-dbm-hz/234449 "2015-03-06T16:34:35Z")
Dear Sir, I am using USRP to receive signal, and then plot the signal using “WX GUI FFT Sink”. I hope to get the vertical axis as “Power Spectral Density in dBm/Hz”. Is there any way to do that? Regards. --- ## [Invitation to SDRA-2015 and HAMRADIO Friedrichshafen](https://www.ruby-forum.com/t/invitation-to-sdra-2015-and-hamradio-friedrichshafen/234464)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 6, 2015, 4:10pm UTC](https://www.ruby-forum.com/t/invitation-to-sdra-2015-and-hamradio-friedrichshafen/234464 "2015-03-06T16:10:44Z")
Dear list, please feel invited to contribute to SDRA-2015! Hope we meet at Friedrichshafen! br / vy73 markus dl8rds \*\* apologies for cross-posting \*\* Call for Papers: … --- ## [Gnuradio importerror undefined symbol](https://www.ruby-forum.com/t/gnuradio-importerror-undefined-symbol/234448)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [March 6, 2015, 12:04pm UTC](https://www.ruby-forum.com/t/gnuradio-importerror-undefined-symbol/234448 "2015-03-06T12:04:45Z")
I’m new to Gnuradio and python. I’m trying to write a correlation block, somewhere in my code I use fft filter: gr::filter::kernel::fft\_filter\_ccc \*d\_filter; d\_filter = new gr::filter::kernel::fft\_filter\_ccc(1, x\_vec… --- ## [How to show the internal clock on the flowgraph](https://www.ruby-forum.com/t/how-to-show-the-internal-clock-on-the-flowgraph/234406)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [March 6, 2015, 10:08am UTC](https://www.ruby-forum.com/t/how-to-show-the-internal-clock-on-the-flowgraph/234406 "2015-03-06T10:08:17Z")
Hi everyone, I’m using a USRP B210 board, and I don’t know how to watch on the flowgraph the internal clock of the board, I need it to compare the time difference of two signals. Please Help Meeeee. Thanks Manuel --- ## [Issues Installing From Source](https://www.ruby-forum.com/t/issues-installing-from-source/234436)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 10\ **Last updated:** [March 5, 2015, 11:45pm UTC](https://www.ruby-forum.com/t/issues-installing-from-source/234436 "2015-03-05T23:45:08Z")
Hello, In the past, I’ve always used the build-gnuradio script to install everything with great success. This ensures that I have all the latest versions of both GNU Radio and UHD. However, I recently got a new mach… --- ## [How do YOU packet detect?](https://www.ruby-forum.com/t/how-do-you-packet-detect/234439)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [March 5, 2015, 10:17pm UTC](https://www.ruby-forum.com/t/how-do-you-packet-detect/234439 "2015-03-05T22:17:09Z")
Hi all, As the subject states, how have you detected packets in your packet based gnu radio SDR? The only example I have come across is Tom’s OFDM packet detect in the digital examples folder. There, he uses an OFDM… --- ## [Final Deadline 07 March, CROWMCOM Workshop on Cognitive Radio for 5G](https://www.ruby-forum.com/t/final-deadline-07-march-crowmcom-workshop-on-cognitive-radio-for-5g/234456)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 5, 2015, 7:59pm UTC](https://www.ruby-forum.com/t/final-deadline-07-march-crowmcom-workshop-on-cognitive-radio-for-5g/234456 "2015-03-05T19:59:03Z")
Apologies if you receive multiple copies of this call. CALL FOR PAPERS CROWNCOM Workshop on Cognitive Radio for 5G Networks April 21-23, 2015 Doha, Qata Accepted paper will be indexed by IEEExplore. http://crownc… --- ## [Bursty traffic - Under runs](https://www.ruby-forum.com/t/bursty-traffic-under-runs/234454)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 5, 2015, 7:07pm UTC](https://www.ruby-forum.com/t/bursty-traffic-under-runs/234454 "2015-03-05T19:07:32Z")
Hello, I have a flowgraph as below Packet Framer custom message block–\>PDU to tagged stream --\>Modulation –\>Interpolation --\>HackRF(osmocom) What I see is that when there is no packets to transmit HackRF reports und… --- ## [Build error "/usr/local/lib/libpython2.7.a: error adding symbols: Bad value"](https://www.ruby-forum.com/t/build-error-usr-local-lib-libpython2-7-a-error-adding-symbols-bad-value/234453)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 5, 2015, 6:34pm UTC](https://www.ruby-forum.com/t/build-error-usr-local-lib-libpython2-7-a-error-adding-symbols-bad-value/234453 "2015-03-05T18:34:30Z")
I have been attempting to build gnuradio from the source and have encountered this error which is obviously related to my Python installation. I have built Python2.7.8 from source with the confguration: ./configure -… --- ## [Regarding demodulation in ofdm](https://www.ruby-forum.com/t/regarding-demodulation-in-ofdm/234447)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 5, 2015, 4:17pm UTC](https://www.ruby-forum.com/t/regarding-demodulation-in-ofdm/234447 "2015-03-05T16:17:34Z")
sir, i am new to gnc and i am doing a project on ofdm implementation using gnu radio.i am fine with modulation part but got stuck with demodulation.i am requesting you to plz help me in doing demodulation.i am attac… --- ## [DySPAN 5G spectrum challenge](https://www.ruby-forum.com/t/dyspan-5g-spectrum-challenge/234450)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 5, 2015, 3:39pm UTC](https://www.ruby-forum.com/t/dyspan-5g-spectrum-challenge/234450 "2015-03-05T15:39:00Z")
Hi all, This is a gentle reminder for the DySPAN 5G spectrum challenge \[1\] which is organized by IEEE. The primary user and database code is already available on the webpage \[2\]. For more details and queries pleas… --- ## [Confusion, help please](https://www.ruby-forum.com/t/confusion-help-please/234410)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 4, 2015, 8:19pm UTC](https://www.ruby-forum.com/t/confusion-help-please/234410 "2015-03-04T20:19:56Z")
Hello all, I just had a quick question regarding the polyphase channelizer. As a start, I’m trying to divide an input spectrum into 6 channels of equal width. My sample rate for now is 5 MHz and the way I’m calculatin… --- ## [Ais\_rx](https://www.ruby-forum.com/t/ais-rx/234431)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 4, 2015, 6:35pm UTC](https://www.ruby-forum.com/t/ais-rx/234431 "2015-03-04T18:35:21Z")
hello i’m trying to work with gr-ais gui and after ais\_rx runing i have message above: mint@mint ~/src/gr-ais/apps $ ais\_rx linux; GNU C++ version 4.8.2; Boost\_105400; UHD\_003.008.001-105-g91ae742f – Operating ove… --- ## [Finish python app after some processing in a C++ work() function](https://www.ruby-forum.com/t/finish-python-app-after-some-processing-in-a-c-work-function/234421)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [March 4, 2015, 5:42pm UTC](https://www.ruby-forum.com/t/finish-python-app-after-some-processing-in-a-c-work-function/234421 "2015-03-04T17:42:24Z")
Hi, I would like to find a way of saying to Python top\_block that it should stop processing and the application must finish. One of the blocks of the application will be a custom block and after gathering some sample… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=31) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=33)