# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=30 [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:** 31 --- ## [Click-to-tune in Qt GUI Frequency SInk](https://www.ruby-forum.com/t/click-to-tune-in-qt-gui-frequency-sink/234692)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [March 23, 2015, 3:46pm UTC](https://www.ruby-forum.com/t/click-to-tune-in-qt-gui-frequency-sink/234692 "2015-03-23T15:46:46Z")
Just looking at the async message interface for Qt GUI Frequency Sink. The “freq” output (is that a PMT?) is always, it appears, in terms of “display” frequency. Which is cool if you’re using the click-to-tune output… --- ## [CMA Equalizer](https://www.ruby-forum.com/t/cma-equalizer/234696)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 23, 2015, 3:26pm UTC](https://www.ruby-forum.com/t/cma-equalizer/234696 "2015-03-23T15:26:53Z")
Sir, What do the number of taps in the CMA equalizer block represent, I hope it is the channel size. Should it be the number of tap coefficients given for the variable ‘taps’ in the channel model block. If I give ‘t… --- ## [How to use other modules in my out-of-tree module?](https://www.ruby-forum.com/t/how-to-use-other-modules-in-my-out-of-tree-module/234667)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 23, 2015, 2:48pm UTC](https://www.ruby-forum.com/t/how-to-use-other-modules-in-my-out-of-tree-module/234667 "2015-03-23T14:48:53Z")
In my out-of-tree module (in develop) I want to use Reed-Solomon encoder and decoder from gr-dvbt I’ve successfully installed gr-dvbt. In my code, it contains: #include \ #include \ **Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [March 23, 2015, 10:31am UTC](https://www.ruby-forum.com/t/re-fwd-attributeerror-module-object-has-no-attri/234675 "2015-03-23T10:31:54Z") Hi Tom, I have a similar problem. I added a pretty plain block, which uses #include \ and changed my set() according to your description to set(GR\_REQUIRED\_COMPONENTS RUNTIME BLOCKS PMT PDU) Al… --- ## [GSM not detecting station, USRP N210](https://www.ruby-forum.com/t/gsm-not-detecting-station-usrp-n210/234695)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 23, 2015, 4:30am UTC](https://www.ruby-forum.com/t/gsm-not-detecting-station-usrp-n210/234695 "2015-03-23T04:30:38Z")
Hello, I’m having a lot of trouble here while trying to make openBTS work with my USRP N210 to play with GSMs. First of all, a little description of my setup: Software: openbts v5.0 gnuradio UHD from git OS: ub… --- ## [Error using "make" while creating my own block](https://www.ruby-forum.com/t/error-using-make-while-creating-my-own-block/234690)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 22, 2015, 5:01pm UTC](https://www.ruby-forum.com/t/error-using-make-while-creating-my-own-block/234690 "2015-03-22T17:01:42Z")
Hi! I am trying to create my own GNURadio block, coding purely in python. To start with I’m just coding a very simple block. The python code is good, so is the test code. The issues are with cmake and make. When I c… --- ## [Splitting a vector at the output of the FFT](https://www.ruby-forum.com/t/splitting-a-vector-at-the-output-of-the-fft/234630)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [March 21, 2015, 5:06pm UTC](https://www.ruby-forum.com/t/splitting-a-vector-at-the-output-of-the-fft/234630 "2015-03-21T17:06:19Z")
Hello GNUR’s! I am a newbie in this community so I may pose a very simple question… I am trying to split via GUI the output vector of the FFT block in two halves, one with the upper part and one with the lower part -i… --- ## [GNU Radio on Android](https://www.ruby-forum.com/t/gnu-radio-on-android/234566)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 13\ **Last updated:** [March 21, 2015, 8:52am UTC](https://www.ruby-forum.com/t/gnu-radio-on-android/234566 "2015-03-21T08:52:51Z")
Hi, Has a patched version of GNU Radio which runs on Android been released? I’m working on a project where I’m transmitting information over audio from a desktop system to an Android device, and since setting up the … --- ## [Channel Model Block in GNU radio](https://www.ruby-forum.com/t/channel-model-block-in-gnu-radio/234640)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 21, 2015, 3:32am UTC](https://www.ruby-forum.com/t/channel-model-block-in-gnu-radio/234640 "2015-03-21T03:32:57Z")
Hi, I am working on the channel model block in GNU radio. I am confused in setting up the taps.I have a random source that undergoes a QPSK modulation at 4 samples per second.Could you please explain me the concept u… --- ## [GNURadio build is failed (collect2: error: ld returned 1 exit status)](https://www.ruby-forum.com/t/gnuradio-build-is-failed-collect2-error-ld-returned-1-exit-status/234671)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 20, 2015, 5:40pm UTC](https://www.ruby-forum.com/t/gnuradio-build-is-failed-collect2-error-ld-returned-1-exit-status/234671 "2015-03-20T17:40:54Z")
Hi all, When gnuradio is built, it halts as follows. Scanning dependencies of target volk \[ 0%\] Building C object volk/lib/CMakeFiles/volk.dir/constants.c.o Linking C shared library libvolk.so \[ 1%\] Built target v… --- ## [Numerical stability and accuracy of PLL blocks](https://www.ruby-forum.com/t/numerical-stability-and-accuracy-of-pll-blocks/234673)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 20, 2015, 3:58pm UTC](https://www.ruby-forum.com/t/numerical-stability-and-accuracy-of-pll-blocks/234673 "2015-03-20T15:58:47Z")
Hello, does anyone know if any stability and accuracy evaluation of the digital PLL as implemented in GNU Radio exist? I’m trying to measure the frequency of a very low phase-noise signal and I see strange artifacts … --- ## [DC-block block](https://www.ruby-forum.com/t/dc-block-block/234672)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 20, 2015, 3:42pm UTC](https://www.ruby-forum.com/t/dc-block-block/234672 "2015-03-20T15:42:50Z")
I’m wanting to use the DC-block block, and I have questions about its use. My scenario is to use it as a cheap high-pass, with a corner frequency of a few milli-hertz, with samples arriving at 50Hz. It’s not clear ho… --- ## [Fwd: AttributeError: 'module' object has no attribute 'block\_name'](https://www.ruby-forum.com/t/fwd-attributeerror-module-object-has-no-attribute-block-name/234665)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 20, 2015, 2:43pm UTC](https://www.ruby-forum.com/t/fwd-attributeerror-module-object-has-no-attribute-block-name/234665 "2015-03-20T14:43:30Z")
Tom, I sincerely apologize if I have posted this email to the wrong location but this is where the web page sent me. I have forwarded my original email below and hope it shows up as you expected. Any info you can p… --- ## [Gnuradio-companion segmentation fault](https://www.ruby-forum.com/t/gnuradio-companion-segmentation-fault/234670)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 20, 2015, 1:58pm UTC](https://www.ruby-forum.com/t/gnuradio-companion-segmentation-fault/234670 "2015-03-20T13:58:55Z")
I don’t see how this will get threaded, but anyway… I finally got it to work. I had to completely reinstall ubuntu, then I installed gnome-shell chromium-browser & synaptic. I installed gnuradio from synaptic. It unin… --- ## [Tx\_ofdm doubts](https://www.ruby-forum.com/t/tx-ofdm-doubts/234669)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 20, 2015, 1:57pm UTC](https://www.ruby-forum.com/t/tx-ofdm-doubts/234669 "2015-03-20T13:57:07Z")
hey Marcus, Thanks for all your help, now we are able to create our own custom block in GNU radio. While working on given example tx\_ofdm.grc, we have some conceptual doubt regarding chunk to symbol block… Could … --- ## [GRC taps as parameter in hierarchical block?](https://www.ruby-forum.com/t/grc-taps-as-parameter-in-hierarchical-block/234443)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 20, 2015, 10:10am UTC](https://www.ruby-forum.com/t/grc-taps-as-parameter-in-hierarchical-block/234443 "2015-03-20T10:10:02Z")
Hi list, I’m looking for a pointer in using GRC when creating a hierarchical block. The hierarchical block has an parameter block of type None with ID ‘taps’. The Value of the block is ‘filter.firdes.root\_raised\_cosi… --- ## [OpenBTS-UMTS](https://www.ruby-forum.com/t/openbts-umts/232654)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [March 20, 2015, 3:16am UTC](https://www.ruby-forum.com/t/openbts-umts/232654 "2015-03-20T03:16:21Z")
Hi all, Is there anyone who used OpenBTS-UMTS http://openbts.org/w/index.php/OpenBTS-UMTS with USRPs? I want to know is there possible to run this openBTS on USRP with UHD? And if it is, what is the configuration p… --- ## [Re: OFDM test with USRP](https://www.ruby-forum.com/t/re-ofdm-test-with-usrp/234655)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [March 20, 2015, 12:11am UTC](https://www.ruby-forum.com/t/re-ofdm-test-with-usrp/234655 "2015-03-20T00:11:42Z")
Hi Marcus, Thanks for your very detailed comments. My purpose of testing the PER is to facilitate evaluations on further modifications of the codes. I’d like to set up a benchmark like the ones I have shown and then… --- ## [USRP B210 "UHD Error: recv packet demuxer unexpected sid 0xff87ffc3"](https://www.ruby-forum.com/t/usrp-b210-uhd-error-recv-packet-demuxer-unexpected-sid-0xff87ffc3/234661)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 19, 2015, 11:07pm UTC](https://www.ruby-forum.com/t/usrp-b210-uhd-error-recv-packet-demuxer-unexpected-sid-0xff87ffc3/234661 "2015-03-19T23:07:21Z")
Hello: Running examples from: https://static.squarespace.com/static/543ae9afe4b0c3b808d72acd/543aee1fe4b09162d08633d9/543aee20e4b09162d086354d/1395272342027/fm\_channelizer.grc With the the following changes: Mb0 … --- ## [Audio Source configuration](https://www.ruby-forum.com/t/audio-source-configuration/234608)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 5\ **Last updated:** [March 19, 2015, 7:33pm UTC](https://www.ruby-forum.com/t/audio-source-configuration/234608 "2015-03-19T19:33:46Z")
Hello: Can anyone point me to some “color” on how to work with the Audio Source. I am working examples to transmit FM Audio and have problems with Underruns on the UHD:USRP Sink. The examples (from files.ettus.com/… --- ## [GR Dev Call March on Now](https://www.ruby-forum.com/t/gr-dev-call-march-on-now/234656)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 19, 2015, 6:23pm UTC](https://www.ruby-forum.com/t/gr-dev-call-march-on-now/234656 "2015-03-19T18:23:48Z")
Follow us live at GR Dev Call March - YouTube, or on #gnuradio. See ya! M --- ## [Requesting help with HPD block](https://www.ruby-forum.com/t/requesting-help-with-hpd-block/234617)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [March 19, 2015, 5:28pm UTC](https://www.ruby-forum.com/t/requesting-help-with-hpd-block/234617 "2015-03-19T17:28:25Z")
Gnuradioers, I continue to struggle to get the Header/Payload Demux (HPD) block to work properly. The header output port is perfect while the payload output port is not. The payload output port is full of 0’s that s… --- ## [USRP N200 - XCVR2450 Maximum output power](https://www.ruby-forum.com/t/usrp-n200-xcvr2450-maximum-output-power/234651)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 19, 2015, 4:06pm UTC](https://www.ruby-forum.com/t/usrp-n200-xcvr2450-maximum-output-power/234651 "2015-03-19T16:06:45Z")
Hi, I’m working with a USRP N200 which has installed a RF daughterboard XCVR2450. I’ve read in the official webpage that the daughterboard has a ‘typical’ power output of 100mW (20mW). The problem is that I want to p… --- ## [Changing GUI Sink block params on the fly from a custom C++ block?](https://www.ruby-forum.com/t/changing-gui-sink-block-params-on-the-fly-from-a-custom-c-block/234647)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [March 19, 2015, 3:53pm UTC](https://www.ruby-forum.com/t/changing-gui-sink-block-params-on-the-fly-from-a-custom-c-block/234647 "2015-03-19T15:53:37Z")
Hello GNU Radio’ers, I have a GRC flowgraph with a custom C++ block that feeds a stream of vectors of floats to the QT GUI Vector Sink. Which particular internal vector of floats gets streamed out of the custom C++ bl… --- ## [Channel Model Block in GNU radio](https://www.ruby-forum.com/t/channel-model-block-in-gnu-radio/234642)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 19, 2015, 1:57pm UTC](https://www.ruby-forum.com/t/channel-model-block-in-gnu-radio/234642 "2015-03-19T13:57:00Z")
Hi, I am working on the channel model block in GNU radio. I am confused in setting up the taps.I have a random source that undergoes a QPSK modulation at 4 samples per second.Could you please explain me the concept u… --- ## [OFDM test with USRP](https://www.ruby-forum.com/t/ofdm-test-with-usrp/234639)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [March 19, 2015, 1:39pm UTC](https://www.ruby-forum.com/t/ofdm-test-with-usrp/234639 "2015-03-19T13:39:53Z")
Hi everyone, I have built a tx and a rx grc flowchart for OFDM using USRP. I found the range of the amplitude of the input is fairly small in order to get it working (i.e., the USRP at the rx end can successfully dec… --- ## [GUI with Tabs Sizing Question](https://www.ruby-forum.com/t/gui-with-tabs-sizing-question/234638)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 19, 2015, 1:13am UTC](https://www.ruby-forum.com/t/gui-with-tabs-sizing-question/234638 "2015-03-19T01:13:06Z")
Hello, I’m using QT with 3 tabs. The first two tabs have only 4 plots on each of them that fit nicely into the window. On the third tab, I have a lot of plots that I place all in one column. The third tab effects th… --- ## [Gnuradio-companion segmentation fault](https://www.ruby-forum.com/t/gnuradio-companion-segmentation-fault/234637)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 19, 2015, 12:00am UTC](https://www.ruby-forum.com/t/gnuradio-companion-segmentation-fault/234637 "2015-03-19T00:00:35Z")
Greetings, I have been trying to install & run gnuradio for a couple of weeks now. No matter what I do I get a segmentation fault. eventually did a fresh install of ubuntu 14.04.2 & got the build-gnuradio script; inst… --- ## [Phase locked loop](https://www.ruby-forum.com/t/phase-locked-loop/234599)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [March 18, 2015, 10:43pm UTC](https://www.ruby-forum.com/t/phase-locked-loop/234599 "2015-03-18T22:43:29Z")
Hi, Currently I am doing my Final Year Project to develop a phase measurement using Phase Locked Loop theory. I am using USRP N210 for the hardware and I have installed Gnuradio Companion in Ubuntu 12.04 LTS (running … --- ## [How to put things out of a block](https://www.ruby-forum.com/t/how-to-put-things-out-of-a-block/234635)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [March 18, 2015, 8:49pm UTC](https://www.ruby-forum.com/t/how-to-put-things-out-of-a-block/234635 "2015-03-18T20:49:04Z")
Hi all, In GNURadio we had ControlPort capability which is now disabled based on some (unknown to me) reasons. ControlPort gave us a sort of control over flowgraph such as setting or getting different parameters from … [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=29) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=31)