# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=44 [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:** 45 --- ## [Re: RuntimeError: b200: 2 RX 1 TX and 1 RX 2 TX configurations not possible](https://www.ruby-forum.com/t/re-runtimeerror-b200-2-rx-1-tx-and-1-rx-2-tx-configurations-not-possible/233104)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 18, 2014, 3:05am UTC](https://www.ruby-forum.com/t/re-runtimeerror-b200-2-rx-1-tx-and-1-rx-2-tx-configurations-not-possible/233104 "2014-11-18T03:05:00Z")
Hi Lefteris thank you for bringing that up! There has indeed been a bug in UHD caused by parallel access to rx/tx methods by gnuradio. Please find a patch attached that will fix the issue for the time being. This co… --- ## [Log2() missing in MSVC v16](https://www.ruby-forum.com/t/log2-missing-in-msvc-v16/232687)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [November 17, 2014, 11:35pm UTC](https://www.ruby-forum.com/t/log2-missing-in-msvc-v16/232687 "2014-11-17T23:35:46Z")
Hi again. I finally was able to build most of GR using CMake and the generated “Visual Studio 2010” gnuradio.sln file. Since I’m not sure if this platform is supported or not, it may be a futile attempt. I patched c… --- ## [List of GNURadio project](https://www.ruby-forum.com/t/list-of-gnuradio-project/233086)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 16, 2014, 7:40pm UTC](https://www.ruby-forum.com/t/list-of-gnuradio-project/233086 "2014-11-16T19:40:18Z")
Hello, I want to know how to obtain a list of GNURadio projects? After shutting down “cgran” there is no reference for them. Is there anything else? Thanks, Mostafa --- ## [ARRL FMT with GNU Radio](https://www.ruby-forum.com/t/arrl-fmt-with-gnu-radio/233076)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 15, 2014, 8:31pm UTC](https://www.ruby-forum.com/t/arrl-fmt-with-gnu-radio/233076 "2014-11-15T20:31:41Z")
I made a video of the ARRL Frequency Measurement Test I did the other night using the X310, GNU Radio, and Baudline. It covers in detail the flow-graph operation. I measured sub-Hz accuracy, but feel I could have d… --- ## [Stop() the flow graph](https://www.ruby-forum.com/t/stop-the-flow-graph/233040)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 6\ **Last updated:** [November 15, 2014, 1:47pm UTC](https://www.ruby-forum.com/t/stop-the-flow-graph/233040 "2014-11-15T13:47:42Z")
Hi All, I am looking for a solution that start() the flow graph for a definite period of time (in seconds) and after that it stop() it automatically. For example let suppose initial value of time is 14 seconds; it m… --- ## [Change of channels in usrp N200](https://www.ruby-forum.com/t/change-of-channels-in-usrp-n200/233069)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 15, 2014, 9:02am UTC](https://www.ruby-forum.com/t/change-of-channels-in-usrp-n200/233069 "2014-11-15T09:02:38Z")
Hi, How to dynamically change the channels in usrp box without start() and stop()? Regards, Syed Aqeel R. --- ## [B200 firmware version mismatch](https://www.ruby-forum.com/t/b200-firmware-version-mismatch/233067)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 15, 2014, 1:25am UTC](https://www.ruby-forum.com/t/b200-firmware-version-mismatch/233067 "2014-11-15T01:25:23Z")
Hi - I had updated my main dev machine today to Ubuntu 14.10, and used that as an excuse to rebuild my Gnuradio dist from scratch (reload pybombs/etc). Ran one of my existing grc blocks, and got the following error ab… --- ## [Doxygen Support](https://www.ruby-forum.com/t/doxygen-support/233034)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 15, 2014, 12:16am UTC](https://www.ruby-forum.com/t/doxygen-support/233034 "2014-11-15T00:16:01Z")
I just reinstalled uhd+gnuradio with doxygen support enabled. I’m not seeing any difference in the blocks I had hoped to see a difference in, as far as documentation goes. For example, when I double click the Frequen… --- ## [Gr-dvbt2 DVB-T2 transmitter](https://www.ruby-forum.com/t/gr-dvbt2-dvb-t2-transmitter/233057)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 14, 2014, 2:05am UTC](https://www.ruby-forum.com/t/gr-dvbt2-dvb-t2-transmitter/233057 "2014-11-14T02:05:35Z")
I’ve just completed a DVB-T2 transmitter for GnuRadio. This is a baseline implementation of the version 1.1.1 standard. More features to follow, including DVB-T2 Lite. I don’t have a DVB-T2 receiver yet, so it’s un… --- ## [QT GUI on low resolution display](https://www.ruby-forum.com/t/qt-gui-on-low-resolution-display/232972)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [November 13, 2014, 6:27pm UTC](https://www.ruby-forum.com/t/qt-gui-on-low-resolution-display/232972 "2014-11-13T18:27:10Z")
I want to create a frequency spectrum display with a center frequency control on a 800 x 480 LCD display. When I use the QT GUI Frequency Sink with a slider underneath, the slider scale goes off the bottom of the scre… --- ## [Throttle Block Scenario](https://www.ruby-forum.com/t/throttle-block-scenario/233039)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 13, 2014, 3:10pm UTC](https://www.ruby-forum.com/t/throttle-block-scenario/233039 "2014-11-13T15:10:06Z")
I’ve created a flowgraph with two paths. One path allows me to transmit and receive over USRPs while the other path uses UDP loopback to bypass the USRPs if I don’t have them connected and want to do some testing. In… --- ## [Successful installation of GNURadio 3.6.4.1 on Window XP and Windows 8](https://www.ruby-forum.com/t/successful-installation-of-gnuradio-3-6-4-1-on-window-xp-and-windows-8/238234)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 10\ **Last updated:** [November 12, 2014, 10:54pm UTC](https://www.ruby-forum.com/t/successful-installation-of-gnuradio-3-6-4-1-on-window-xp-and-windows-8/238234 "2014-11-12T22:54:07Z")
After much experimentation I have finally found a way to successfully install and fully run GRC 3.6.4.1 both under Windows XP and Windows 8. I presume it should therefore work equally well under Vista and 7. First a … --- ## [USRP spectrum sensing](https://www.ruby-forum.com/t/usrp-spectrum-sensing/233031)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 11\ **Last updated:** [November 12, 2014, 5:32pm UTC](https://www.ruby-forum.com/t/usrp-spectrum-sensing/233031 "2014-11-12T17:32:21Z")
When I implement the source code " usrp\_spectrum\_sense.py", the program can be compile but when I enter the start, end frequency and fft size it comes with a error:‘module’ object has no attribute ’stream\_to\_vector. … --- ## [Asking help about "gr-ieee802-11"](https://www.ruby-forum.com/t/asking-help-about-gr-ieee802-11/240300)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 3\ **Last updated:** [November 12, 2014, 4:12pm UTC](https://www.ruby-forum.com/t/asking-help-about-gr-ieee802-11/240300 "2014-11-12T16:12:18Z")
hi I’m the beginner of gnu radio. I have already follow your step to install all dependencies. but when i do the “OFDM PHY” It said i should open “/examples/wifi\_phy\_hier.grc” in gnuradio-companion and build it but… --- ## [Gr-qtgui Waterfall Time Axis](https://www.ruby-forum.com/t/gr-qtgui-waterfall-time-axis/232674)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 7\ **Last updated:** [November 12, 2014, 2:20pm UTC](https://www.ruby-forum.com/t/gr-qtgui-waterfall-time-axis/232674 "2014-11-12T14:20:39Z")
I have some large spectrum records and I would like to use GR for analysis in a a sort of “off-line” mode. I want to visualize the data using the spectrogram and then identify subsets of interesting features (e.g. Wi… --- ## [Find a Packet in a bit stream](https://www.ruby-forum.com/t/find-a-packet-in-a-bit-stream/233028)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [November 12, 2014, 12:08pm UTC](https://www.ruby-forum.com/t/find-a-packet-in-a-bit-stream/233028 "2014-11-12T12:08:43Z")
Hi, How to tell my receiver to identify a specific packet through a received bit stream? I transmit a custom packet (with header, payload, crc16). Is there any block in gnuradio that I can use for this purpose? I ha… --- ## [Usrp x310 LTE support, with/without external clock](https://www.ruby-forum.com/t/usrp-x310-lte-support-with-without-external-clock/234833)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [November 12, 2014, 9:42am UTC](https://www.ruby-forum.com/t/usrp-x310-lte-support-with-without-external-clock/234833 "2014-11-12T09:42:27Z")
I’m new to gnuradio and sdr. I’m looking to use a x310 usrp in an lte project. I have read it can support a 184.32MHz clock frequency which is great for LTE and a sample rate of 30.72MHz. I have looked at the uhd so… --- ## [FIR filter Interpolation vs Resampler](https://www.ruby-forum.com/t/fir-filter-interpolation-vs-resampler/232965)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [November 12, 2014, 8:52am UTC](https://www.ruby-forum.com/t/fir-filter-interpolation-vs-resampler/232965 "2014-11-12T08:52:18Z")
Hi I derive the output of a signal, both to an Interpolating FIR filter and Rational Resampler (in parallel) and then I connect them to a Time Sink (with 2 inputs). I use the same interpolation factor for both blocks… --- ## [Change in 3.7 with buffers](https://www.ruby-forum.com/t/change-in-3-7-with-buffers/233007)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [November 11, 2014, 10:12pm UTC](https://www.ruby-forum.com/t/change-in-3-7-with-buffers/233007 "2014-11-11T22:12:39Z")
Sorry - I seem to keep running into weird corner cases with my program. I am having an issue were I am trying to run multiple graphs off the same source, and decoding different channels digital audio to wav files. It … --- ## [CPU Affinity vs Hier Blocks](https://www.ruby-forum.com/t/cpu-affinity-vs-hier-blocks/232795)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [November 11, 2014, 9:58pm UTC](https://www.ruby-forum.com/t/cpu-affinity-vs-hier-blocks/232795 "2014-11-11T21:58:55Z")
Hi Folks, A quick question on CPU affinity when using hier blocks. I can set the affinity in each of the blocks that makes up the heir block, but I can also set it once I instantiate my hier block in my main flowgraph… --- ## [\[GRCWG\] Next call on Nov 18](https://www.ruby-forum.com/t/grcwg-next-call-on-nov-18/233020)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [November 11, 2014, 7:39pm UTC](https://www.ruby-forum.com/t/grcwg-next-call-on-nov-18/233020 "2014-11-11T19:39:14Z")
Hey, the GRCWG is meeting on Nov 18, 6pm UTC. Here is the wiki page for the call: http://gnuradio.org/redmine/projects/gnuradio/wiki/Call20141118 Sebastian – Karlsruhe Institute of Technology (KIT) Communications … --- ## [Signal Source Coherence](https://www.ruby-forum.com/t/signal-source-coherence/233016)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 11, 2014, 6:45pm UTC](https://www.ruby-forum.com/t/signal-source-coherence/233016 "2014-11-11T18:45:32Z")
Hello list, Please refer to the attached flowgraph. In it I use two methods to generate 3 tones of equal amplitude. The first method simply uses 3 signal sources to generate the required tones directly and sums them … --- ## [URSP noise](https://www.ruby-forum.com/t/ursp-noise/233014)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [November 11, 2014, 5:39pm UTC](https://www.ruby-forum.com/t/ursp-noise/233014 "2014-11-11T17:39:15Z")
hi everyone. i was working with the USRP1. I’m testing a MOD/DEMOD DBPSK. I have only one USRP, so, i connected TX\_A( from daughterboard LFTX-LF) to RX\_A ( from daughterborad LFRX-LF) with a coaxil. All system wor… --- ## [Gr-pyserial](https://www.ruby-forum.com/t/gr-pyserial/232999)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [November 11, 2014, 7:32am UTC](https://www.ruby-forum.com/t/gr-pyserial/232999 "2014-11-11T07:32:24Z")
Hi all! I’m working with gr-pyserial but when i run my blocks i get the following: Loading: “/home/iua/gr-pyserial-master/examples/vsp\_connect.grc” Done Showing: “/home/iua/gr-pyserial-master/examples/vsp\_conne… --- ## [C++ Class in out of tree module 3.7](https://www.ruby-forum.com/t/c-class-in-out-of-tree-module-3-7/233004)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 10, 2014, 8:58pm UTC](https://www.ruby-forum.com/t/c-class-in-out-of-tree-module-3-7/233004 "2014-11-10T20:58:28Z")
I am trying to add a non block C++ class to the out of tree build of a module. I successfully compile the code but all my Python tests fail. File “/python/qa\_test.py”, line 24, in import example\_swig as example F… --- ## [Constellation Object](https://www.ruby-forum.com/t/constellation-object/232921)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [November 10, 2014, 7:32pm UTC](https://www.ruby-forum.com/t/constellation-object/232921 "2014-11-10T19:32:31Z")
The symbol map feature of the constellation object doesn’t seem to do anything. In fact, you can leave it blank. The index of the constellation points is used to map the complex points to bits. The documentation lead… --- ## [Rpc server setup](https://www.ruby-forum.com/t/rpc-server-setup/232939)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 10, 2014, 7:22pm UTC](https://www.ruby-forum.com/t/rpc-server-setup/232939 "2014-11-10T19:22:58Z")
GR nation, My first attempt at this question was foiled by my e-mail program’s insistance on sending html. I apologize for the repeat. I am interested in using controlport for monitoring, debug, and control of a flo… --- ## [Issue with tuntap\_pdu](https://www.ruby-forum.com/t/issue-with-tuntap-pdu/232957)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 10, 2014, 6:08pm UTC](https://www.ruby-forum.com/t/issue-with-tuntap-pdu/232957 "2014-11-10T18:08:23Z")
I am trying to run the example simple\_trx.py script from the gr-mac module and I am having an issue related to what I believe is gr::blocks::tuntap\_pdu. This is what I am doing. I open up a couple of terminal window… --- ## [CentOS 7 GR 3.7.5.1 wxPython 3.0 Ettus B210 and R820T](https://www.ruby-forum.com/t/centos-7-gr-3-7-5-1-wxpython-3-0-ettus-b210-and-r820t/232986)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 10, 2014, 5:07pm UTC](https://www.ruby-forum.com/t/centos-7-gr-3-7-5-1-wxpython-3-0-ettus-b210-and-r820t/232986 "2014-11-10T17:07:31Z")
Just got this limping around. need CentOS/RHEL baseline for a variety of reasons really rather have WX as other code uses it pybombs did not seem to do the job built from gnuradio git sources UHD 3.7.1 osmocore and rtl… --- ## [Interfacing new hardware](https://www.ruby-forum.com/t/interfacing-new-hardware/232998)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [November 10, 2014, 12:43pm UTC](https://www.ruby-forum.com/t/interfacing-new-hardware/232998 "2014-11-10T12:43:00Z")
Hi, I keep searching for 3 days on how to interface my new RF board with GNURadio, is there a guide documentation on how to create source sink blocks as an interface to my RF board with GNURadio companion. I already … [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=43) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=45)