# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=75 [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:** 76 --- ## [Re: Questions on callback functions implementation of blocks in gr-trellis](https://www.ruby-forum.com/t/re-questions-on-callback-functions-implementation-of-blocks-in-gr-trellis/240866)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 4, 2014, 3:18am UTC](https://www.ruby-forum.com/t/re-questions-on-callback-functions-implementation-of-blocks-in-gr-trellis/240866 "2014-05-04T03:18:10Z")
Zhe, there are way too many changes in this diff file for anyone to track and debug. I suggest you start with a clean gr-trellis and change JUST one block (say the viterbi\_combined) and see if this change propagate… --- ## [Configuration incomplete , errors occur!](https://www.ruby-forum.com/t/configuration-incomplete-errors-occur/240856)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 3, 2014, 4:25pm UTC](https://www.ruby-forum.com/t/configuration-incomplete-errors-occur/240856 "2014-05-03T16:25:15Z")
I am installing GNU radio using this command wget http://www.sbrac.org/files/build-gnuradio && chmod a+x ./build-gnuradio && ./build-gnuradio --verbose But I found at the end of the installation an error (after 2 hour… --- ## [Fwd: configuration incomplete , errors occur!](https://www.ruby-forum.com/t/fwd-configuration-incomplete-errors-occur/240862)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 3, 2014, 11:31am UTC](https://www.ruby-forum.com/t/fwd-configuration-incomplete-errors-occur/240862 "2014-05-03T11:31:03Z")
Hello Sara, this is very strange. It looks like there’s an extra module (that you shouldn’t be rebuilding, anyway) which tries to find an old version of GNU Radio. Can you tell us which module that is? You should re… --- ## [Questions on callback functions implementation of blocks in gr-trellis](https://www.ruby-forum.com/t/questions-on-callback-functions-implementation-of-blocks-in-gr-trellis/240859)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 3, 2014, 8:33am UTC](https://www.ruby-forum.com/t/questions-on-callback-functions-implementation-of-blocks-in-gr-trellis/240859 "2014-05-03T08:33:36Z")
Hi all, I’m working on a system with trellis coding and I met a problem with the python callback function generated by grc . Because there are several parameters used in the blocks needs to be updated. I added callbac… --- ## [FYI: "make test" error in qa\_python\_message\_passing as of devel commit b20df754](https://www.ruby-forum.com/t/fyi-make-test-error-in-qa-python-message-passing-as-of-devel-commit-b20df754/240842)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 3, 2014, 2:52am UTC](https://www.ruby-forum.com/t/fyi-make-test-error-in-qa-python-message-passing-as-of-devel-commit-b20df754/240842 "2014-05-03T02:52:03Z")
% ctest -V -R python\_message UpdateCTestConfiguration from :/opt/MacPorts/trunk/dports/science/gnuradio/work/build/DartConfiguration.tcl UpdateCTestConfiguration from :/opt/MacPorts/trunk/dports/science/gnuradio/wo… --- ## [How to decode packets in Gnuradio](https://www.ruby-forum.com/t/how-to-decode-packets-in-gnuradio/240823)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [May 2, 2014, 11:05pm UTC](https://www.ruby-forum.com/t/how-to-decode-packets-in-gnuradio/240823 "2014-05-02T23:05:05Z")
Hi All, I am new to Gnuradio and trying to decode of bit stream transmitted from a simple FSK transmitter like RFM22 without utilizing any OOT block (only using basic GRC blocks available). Packet format is 8 nibbl… --- ## [On air 16\_QAM transmission problem with USRP N210](https://www.ruby-forum.com/t/on-air-16-qam-transmission-problem-with-usrp-n210/240769)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 12\ **Last updated:** [May 2, 2014, 5:00pm UTC](https://www.ruby-forum.com/t/on-air-16-qam-transmission-problem-with-usrp-n210/240769 "2014-05-02T17:00:54Z")
Hi all, I am trying to build transmission on air by using USRPs N210. The transmission is good with MPSK modulations but when i try to use 16\_QAM i could not receive data (0 bytes at the reception). I tried to adapte … --- ## [GR 3.7 Namespace Question](https://www.ruby-forum.com/t/gr-3-7-namespace-question/240840)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 2, 2014, 4:43pm UTC](https://www.ruby-forum.com/t/gr-3-7-namespace-question/240840 "2014-05-02T16:43:04Z")
With the new use of C++ namespaces in the 3.7 API, is it possible for an Out-of-tree (OOT) module to create blocks that are part of an existing GR namespace? For instance, if I have a new block that processes digital … --- ## [Difference between ofdm\_txrx.py and benchmark ofdm program](https://www.ruby-forum.com/t/difference-between-ofdm-txrx-py-and-benchmark-ofdm-program/240838)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [May 2, 2014, 4:20pm UTC](https://www.ruby-forum.com/t/difference-between-ofdm-txrx-py-and-benchmark-ofdm-program/240838 "2014-05-02T16:20:57Z")
Hi, We are experimenting with ofdm transmission and reception. We are using benchmark\_tx.py and benchmark\_rx.py for transmission and reception in the examples folder of gnuradio ( /usr/local/share/gnuradio/example… --- ## [Testing](https://www.ruby-forum.com/t/testing/240774)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 5\ **Last updated:** [May 2, 2014, 3:49pm UTC](https://www.ruby-forum.com/t/testing/240774 "2014-05-02T15:49:35Z")
I am testing some blocks to understand the synchronization in ofdm . I edited c++ files & put std::cout for all variables in frequency\_modulator\_fc\_impl.cc and multiply\_cc\_impl.cc and then I rebuilt using cmake…/ th… --- ## [OFDM Example, 'Noisy' final symbol](https://www.ruby-forum.com/t/ofdm-example-noisy-final-symbol/240786)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 8\ **Last updated:** [May 1, 2014, 11:12pm UTC](https://www.ruby-forum.com/t/ofdm-example-noisy-final-symbol/240786 "2014-05-01T23:12:24Z")
Hi Martin, All, Has anyone noticed that the final symbol of any burst (no matter how many packets in a transmission) appears slightly ‘noisy’ in the OFDM example code? Is it something to do with my set-up? I attach a… --- ## [Announcing NEWSDR Event in Boston on Friday June 6](https://www.ruby-forum.com/t/announcing-newsdr-event-in-boston-on-friday-june-6/240821)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [May 1, 2014, 9:35pm UTC](https://www.ruby-forum.com/t/announcing-newsdr-event-in-boston-on-friday-june-6/240821 "2014-05-01T21:35:15Z")
Fourth-Annual \* \* New England Workshop on Software-Defined Radio \* NEWSDR 2014 \* … --- ## [Implementation of ofdm](https://www.ruby-forum.com/t/implementation-of-ofdm/240814)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [May 1, 2014, 8:54pm UTC](https://www.ruby-forum.com/t/implementation-of-ofdm/240814 "2014-05-01T20:54:38Z")
hai im anjana doing mtech in amrita vishwavidya peetham.ettimadai,coimbatore,tamilnadu,india. sir, im trying to do ofdm communication system including channel estimation and synchronization. im having a doubt about th… --- ## [1st IEEE Signal Intelligence Challenge](https://www.ruby-forum.com/t/1st-ieee-signal-intelligence-challenge/240805)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 30, 2014, 10:45pm UTC](https://www.ruby-forum.com/t/1st-ieee-signal-intelligence-challenge/240805 "2014-04-30T22:45:13Z")
Hi everyone, on behalf of the IEEE student branch Karlsruhe\[1\], I’m happy to present the 1st IEEE Signal Intelligence Challenge (ISIC). Briefly, it’s a challenge to find, decode and decrypt 10 signals in a given chun… --- ## [Obtaining 'time\_spec' from Out-of-tree C++ Module](https://www.ruby-forum.com/t/obtaining-time-spec-from-out-of-tree-c-module/240789)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 30, 2014, 4:07pm UTC](https://www.ruby-forum.com/t/obtaining-time-spec-from-out-of-tree-c-module/240789 "2014-04-30T16:07:06Z")
Dear All, I would like to have knowledge of the USRP time in my transmitter flow graph. In the receiver flow graph this is straight forward because ‘rx\_time’ tag is propagated from a USRP source as a tag. How can I o… --- ## [Parameters of NBFM block in GNU Radio companion](https://www.ruby-forum.com/t/parameters-of-nbfm-block-in-gnu-radio-companion/240734)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 3\ **Last updated:** [April 30, 2014, 4:11am UTC](https://www.ruby-forum.com/t/parameters-of-nbfm-block-in-gnu-radio-companion/240734 "2014-04-30T04:11:52Z")
Can anybody explain to me the following parameters of NBFM block in GRC: Audio rate Quadrature rate Tau --- ## [GSoC14 Gr-trellis](https://www.ruby-forum.com/t/gsoc14-gr-trellis/240754)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 30, 2014, 3:20am UTC](https://www.ruby-forum.com/t/gsoc14-gr-trellis/240754 "2014-04-30T03:20:39Z")
Hey, another Google Summer of Code announcement! I’ll be doing a project on speeding up gr-trellis! Whoever wants more info on my project can get it on Github and I will post most of my updates on my GSoC14 Blog So… --- ## [Error running loopback](https://www.ruby-forum.com/t/error-running-loopback/240767)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 30, 2014, 12:10am UTC](https://www.ruby-forum.com/t/error-running-loopback/240767 "2014-04-30T00:10:23Z")
per my last: Tried running the loopback example, get comparable error message: linux; GNU C++ version 4.6.3; Boost\_104800; UHD\_003.007.000-133-g6bd9fed2 Using Volk machine: avx\_64\_mmx\_orc – Opening a USRP1 device… … --- ## [Using uhd\_fft with USRP1](https://www.ruby-forum.com/t/using-uhd-fft-with-usrp1/240764)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 29, 2014, 11:03pm UTC](https://www.ruby-forum.com/t/using-uhd-fft-with-usrp1/240764 "2014-04-29T23:03:36Z")
Ok, I got the address correct, I know the usrp and daughtercard are there. I can’t get the simplest uhd\_fft to run from GRC. I get the following message on trying to execute, Generating the graph works. – Opening a… --- ## [X300, PCIe, Windows 7](https://www.ruby-forum.com/t/x300-pcie-windows-7/240744)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 1\ **Last updated:** [April 29, 2014, 10:09pm UTC](https://www.ruby-forum.com/t/x300-pcie-windows-7/240744 "2014-04-29T22:09:36Z")
Hi all, I am wondering if someone had success using a X300 on Windows with the PCIe connection. I can see the X300 with uhd\_find\_devices (UHD 3.7.0): – UHD Device 0 Device Address: type: x300 addr: 192.168.10.2 fpg… --- ## [Gr-air-modes compilation](https://www.ruby-forum.com/t/gr-air-modes-compilation/240725)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [April 29, 2014, 12:31pm UTC](https://www.ruby-forum.com/t/gr-air-modes-compilation/240725 "2014-04-29T12:31:38Z")
I am trying to compile the lasted code from github and am getting an error from CMake. It is looking for pyZMQ and not finding it. I tried to install the module but not having much luck - that is it is not simple. … --- ## [X300 PCIe issues](https://www.ruby-forum.com/t/x300-pcie-issues/240697)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 13\ **Last updated:** [April 29, 2014, 11:40am UTC](https://www.ruby-forum.com/t/x300-pcie-issues/240697 "2014-04-29T11:40:13Z")
I have my new x300’s. The NI ExpressCard-8360B is recognized by my Intel 5, Lenovo, 64 bit machine running U 14.04 LTS. I naively assumed that given the way things had gone before, that this would be a low impact ou… --- ## [Making new block with GRC or write python](https://www.ruby-forum.com/t/making-new-block-with-grc-or-write-python/240570)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 2\ **Last updated:** [April 29, 2014, 8:23am UTC](https://www.ruby-forum.com/t/making-new-block-with-grc-or-write-python/240570 "2014-04-29T08:23:54Z")
Dear List, To make my question on https://www.mail-archive.com/removed\_email\_address@domain.invalid/msg48001.html more clear, I would like to add more details. I want to implement a bidirectional two-way relaying net… --- ## [Fir\_filter\_ccc::filter function confusion](https://www.ruby-forum.com/t/fir-filter-ccc-filter-function-confusion/240749)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 29, 2014, 4:43am UTC](https://www.ruby-forum.com/t/fir-filter-ccc-filter-function-confusion/240749 "2014-04-29T04:43:05Z")
Hello, Hi, I am trying to calculate the conj(w(n))\*s(n) where w(n) is the filter weights and s(n) is the signal and Both are complex numbers. I wanted to use fir\_filter\_ccc, but I noticed that it uses volk\_32fc\_x2\_d… --- ## [Re: \[USRP-users\] X300 PCIe issues](https://www.ruby-forum.com/t/re-usrp-users-x300-pcie-issues/240742)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 0\ **Last updated:** [April 28, 2014, 4:48pm UTC](https://www.ruby-forum.com/t/re-usrp-users-x300-pcie-issues/240742 "2014-04-28T16:48:55Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [UHD in Windows - \_uhd\_swig not found](https://www.ruby-forum.com/t/uhd-in-windows-uhd-swig-not-found/240722)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 28, 2014, 3:45pm UTC](https://www.ruby-forum.com/t/uhd-in-windows-uhd-swig-not-found/240722 "2014-04-28T15:45:35Z")
Hello, I’m getting the following error when trying to run a gnuradio graph with USRP in windows: File “c:\\Program Files\\gnuradio\\lib\\site-packages\\gnuradio\\uhd\\uhd\_swig.py”, line 22, in swig\_import\_helper \_mod = im… --- ## [Re: Problem in using trellis Error, correction en- and decoder](https://www.ruby-forum.com/t/re-problem-in-using-trellis-error-correction-en-and-decoder/198715)
**Author:** [@okkezSS](https://www.ruby-forum.com/u/okkezSS)\ **Replies:** 3\ **Last updated:** [April 28, 2014, 2:55pm UTC](https://www.ruby-forum.com/t/re-problem-in-using-trellis-error-correction-en-and-decoder/198715 "2014-04-28T14:55:16Z")
in the past Achilleas wrote:------- There are a couple of potential problems with your flowgraph: the trellis encoder outputs unpacked bytes. For example, if your FSM has output cardinality 4 then it outputs 2 usefu… --- ## [Sensitivity parameter in Freq Modulation block](https://www.ruby-forum.com/t/sensitivity-parameter-in-freq-modulation-block/240735)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 0\ **Last updated:** [April 28, 2014, 12:10pm UTC](https://www.ruby-forum.com/t/sensitivity-parameter-in-freq-modulation-block/240735 "2014-04-28T12:10:49Z")
Hi I am trying to generate an LFM signal using GNU radio and USRP but I am not sure about the interpretation of Sensitivity parameter in Freq Modulation block that what are its units, what is the possible range of va… --- ## [Waveform after AM demodulation looks weird](https://www.ruby-forum.com/t/waveform-after-am-demodulation-looks-weird/240685)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 10\ **Last updated:** [April 28, 2014, 11:54am UTC](https://www.ruby-forum.com/t/waveform-after-am-demodulation-looks-weird/240685 "2014-04-28T11:54:51Z")
Hi, you can find in attach AM demodulator grc file. Everything is straight forward with demod but audio file generated looks weird. Only positive values of amplitude. In FFT i do see symmetric picture. I enabled/disa… --- ## [Regd: IIP3 and OIP3 measurements for USRPN210](https://www.ruby-forum.com/t/regd-iip3-and-oip3-measurements-for-usrpn210/240481)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 2\ **Last updated:** [April 28, 2014, 10:21am UTC](https://www.ruby-forum.com/t/regd-iip3-and-oip3-measurements-for-usrpn210/240481 "2014-04-28T10:21:27Z")
Hi My project is dealing with Tx/Rx Characterization. I wanted to know if anyone has tried finding the IIP3 and OIP3 for the USRP N210 with WBX and SBX daughter-boards. I did an experiment on Tx side ( USRP behaving… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=74) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=76)