# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=38 [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:** 39 --- ## [Issues in Using File Source](https://www.ruby-forum.com/t/issues-in-using-file-source/233875)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 21, 2015, 6:11am UTC](https://www.ruby-forum.com/t/issues-in-using-file-source/233875 "2015-01-21T06:11:38Z")
Greetings to all, I am trying to send a bit stream “1110011” using file source. For that, I created a bin file using “gedit”, typed 1110011 in it and saved it. After that, I gave the path of bin file in GRC File sou… --- ## [Bugs/Features Pybombs](https://www.ruby-forum.com/t/bugs-features-pybombs/233893)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 20, 2015, 7:47pm UTC](https://www.ruby-forum.com/t/bugs-features-pybombs/233893 "2015-01-20T19:47:10Z")
Reporting what feel like two bugs in pybombs that only arise in CentOS. You won’t encounter these in Ubuntu. 1) Minor feature/bug: The config.defaults file does not contain rpm in the satisfy order list. It needs to … --- ## [GRC Command Not Found](https://www.ruby-forum.com/t/grc-command-not-found/233841)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 9\ **Last updated:** [January 20, 2015, 6:54pm UTC](https://www.ruby-forum.com/t/grc-command-not-found/233841 "2015-01-20T18:54:05Z")
Hello all, I’ve used pybombs to install uhd+gnuradio on CentOS 6.6 x86\_64. I then executed ./pybombs env and sourced the generated file in my .bashrc. After completely restarting my computer to make sure nothing funn… --- ## [Considerations when running a flowgraph manually from a loop](https://www.ruby-forum.com/t/considerations-when-running-a-flowgraph-manually-from-a-loop/233763)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 20, 2015, 4:07pm UTC](https://www.ruby-forum.com/t/considerations-when-running-a-flowgraph-manually-from-a-loop/233763 "2015-01-20T16:07:59Z")
Hi all, I’ve written a small program to capture and plot fft data from the USRP. Because it can also sweep and I have a limited knowledge (for now!) of writing GNURadio blocks, I decided to use a separate main loop to… --- ## [Gr-ieee802-11 installation worng when "make"](https://www.ruby-forum.com/t/gr-ieee802-11-installation-worng-when-make/233071)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 20, 2015, 2:29pm UTC](https://www.ruby-forum.com/t/gr-ieee802-11-installation-worng-when-make/233071 "2015-01-20T14:29:53Z")
hello, I’m trying to install “gr-ieee802-11” from “bastibl” for receiving the IEEE802.11 wifi signal by usrp with gnuradio. (GitHub - bastibl/gr-ieee802-11: IEEE 802.11 a/g/p Transceiver) when i “make” it…I got the er… --- ## [Consuming all inputs, small outputs](https://www.ruby-forum.com/t/consuming-all-inputs-small-outputs/233883)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 4\ **Last updated:** [January 19, 2015, 10:06pm UTC](https://www.ruby-forum.com/t/consuming-all-inputs-small-outputs/233883 "2015-01-19T22:06:23Z")
I am trying to create a block that outputs one number from each chucnk of data it takes in, I would like to output this number and be able to use it in visualizations, what would the best block be for this? Would a … --- ## [Re: anyone familiar with this BOOST error](https://www.ruby-forum.com/t/re-anyone-familiar-with-this-boost-error/233879)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 19, 2015, 8:33pm UTC](https://www.ruby-forum.com/t/re-anyone-familiar-with-this-boost-error/233879 "2015-01-19T20:33:56Z")
I think I have a hunch as to what this is. Some googling showed that this happens when you are trying to spawn more threads than your machine can handle. From your previous post/discussions I understand this happens w… --- ## [Trouble with PMTs](https://www.ruby-forum.com/t/trouble-with-pmts/233872)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 19, 2015, 4:33pm UTC](https://www.ruby-forum.com/t/trouble-with-pmts/233872 "2015-01-19T16:33:02Z")
I’m updating older code from using the old streaming messaging to the new and improved message passing and PMTs. However I am getting an error compiling. Here is the code snippet: void energy\_detector\_sink\_f\_impl::s… --- ## [Log POWER FFT Output - Samples flipped in frequency](https://www.ruby-forum.com/t/log-power-fft-output-samples-flipped-in-frequency/233876)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 19, 2015, 2:47pm UTC](https://www.ruby-forum.com/t/log-power-fft-output-samples-flipped-in-frequency/233876 "2015-01-19T14:47:30Z")
Hi, I am working with a B200 and GNURadio over Debian. At first sight, UHD driver and GNURadio work fine with my B200. In my first example I am sampling at 2Msamples centered at 938MHz. I generate a 20KHz FM signal w… --- ## [Re: Max Output Power from the LFTX](https://www.ruby-forum.com/t/re-max-output-power-from-the-lftx/233733)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 23\ **Last updated:** [January 19, 2015, 8:11am UTC](https://www.ruby-forum.com/t/re-max-output-power-from-the-lftx/233733 "2015-01-19T08:11:41Z")
Thanks Marcus for your reply. Probably somewhere in the neighborhood of +7dBm, maybe a little more. The LF/BASIC series have no gain in either path, so you’re just looked at buffered ADC ouput. So, ~ +7dBm is… --- ## [2xB210 boards via USB 3.0 (UHD C++)](https://www.ruby-forum.com/t/2xb210-boards-via-usb-3-0-uhd-c/233857)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 18, 2015, 1:24pm UTC](https://www.ruby-forum.com/t/2xb210-boards-via-usb-3-0-uhd-c/233857 "2015-01-18T13:24:17Z")
Greetings, Any one trying to connect two of those boards to collect samples from 4 channels simultaneously? One of ettus examples says that: Specify --args to select multiple motherboards in a configuration.\\n" " Ex… --- ## [Threaded GRC blocks](https://www.ruby-forum.com/t/threaded-grc-blocks/233850)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [January 17, 2015, 2:55pm UTC](https://www.ruby-forum.com/t/threaded-grc-blocks/233850 "2015-01-17T14:55:15Z")
I’m new to gnu radio, but I am trying to port a thread SDR application in to a GRC block. My application buffers a bunch of data and then performs some signal processing on it that can take up to 500ms. Once process… --- ## [Anyone familiar with this BOOST error](https://www.ruby-forum.com/t/anyone-familiar-with-this-boost-error/233854)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 17, 2015, 6:17am UTC](https://www.ruby-forum.com/t/anyone-familiar-with-this-boost-error/233854 "2015-01-17T06:17:45Z")
I was trying to execute a program and got the following message. Does anyone know what this means and what I should do.Using Volk machine: avx\_32\_mmx\_orc terminate called after throwing an instance of 'boost::excepti… --- ## [Basic installation](https://www.ruby-forum.com/t/basic-installation/233851)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 17, 2015, 1:33am UTC](https://www.ruby-forum.com/t/basic-installation/233851 "2015-01-17T01:33:50Z")
I just purchased a Ubuntu computer from Micro center to run gnu radio. I have never used Linux and I am having a heck of a time installing the software. The installation guide on gnu radio says to use the command : a… --- ## [Testing an GRC project runs nearly 200% CPU](https://www.ruby-forum.com/t/testing-an-grc-project-runs-nearly-200-cpu/233839)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 8\ **Last updated:** [January 16, 2015, 3:49pm UTC](https://www.ruby-forum.com/t/testing-an-grc-project-runs-nearly-200-cpu/233839 "2015-01-16T15:49:03Z")
Hi, iam testing an UKW Radio Receiver GRC project (gr-rds) on bananapi. The application starts. The tuned radio station sounds clicking. Changing any parameter in the GUI is very difficult/slow. top tells me a memory… --- ## [Two Tx channels, one motherboard (N200+LFTX)](https://www.ruby-forum.com/t/two-tx-channels-one-motherboard-n200-lftx/233848)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 16, 2015, 3:27pm UTC](https://www.ruby-forum.com/t/two-tx-channels-one-motherboard-n200-lftx/233848 "2015-01-16T15:27:22Z")
Hi, Is it possible to use two separate Tx channels (A:A A:B with two different center frequencies) for the N200 with the LFTX daughterboard? I tried to do this on the Rx side and it seems to work just fine. However, … --- ## [Using Scrambler](https://www.ruby-forum.com/t/using-scrambler/233545)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 16, 2015, 1:22pm UTC](https://www.ruby-forum.com/t/using-scrambler/233545 "2015-01-16T13:22:06Z")
Hi,I want to use the scrambling polynomial: 1 + X^12 + X^17. This means the currentlytransmitted bit is the EXOR of the current data bit, plus the bits thatwere transmitted 12 and 17 bits earlier.But I’m not sure what… --- ## [Re: Distorted QPSK Constellation](https://www.ruby-forum.com/t/re-distorted-qpsk-constellation/233819)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [January 15, 2015, 8:30pm UTC](https://www.ruby-forum.com/t/re-distorted-qpsk-constellation/233819 "2015-01-15T20:30:51Z")
I believe that even with the MF you’ll have ISI because you have 4 samples/symbol in this example. Only if you down sample at 1 sample/symbol (at the right epoch) will you get rid of the ISI and get a clean QPSK. bes… --- ## [Voltage pulse from UHD driver](https://www.ruby-forum.com/t/voltage-pulse-from-uhd-driver/233835)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 11\ **Last updated:** [January 15, 2015, 8:01pm UTC](https://www.ruby-forum.com/t/voltage-pulse-from-uhd-driver/233835 "2015-01-15T20:01:19Z")
Hi all, I’ve been slowly working to understand/isolate an issue with a strange voltage pulse at all freqs and on USRP N210 with 50 Ohm load. I posted about it on StackExchange here, and there are more details at this… --- ## [PDU\_to\_tagged\_stream consumes 100% CPU even though it is throttled!](https://www.ruby-forum.com/t/pdu-to-tagged-stream-consumes-100-cpu-even-though-it-is-throttled/233818)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 11\ **Last updated:** [January 15, 2015, 7:37pm UTC](https://www.ruby-forum.com/t/pdu-to-tagged-stream-consumes-100-cpu-even-though-it-is-throttled/233818 "2015-01-15T19:37:53Z")
Hi all, I have the following problem that is been bugging me for quite some time now, and I would like to solicit your help. I made a hier block in GRC (called “test\_pdu\_to\_tag”) with: pad\_source—\>pdu\_to\_tagged\_stre… --- ## [Dev Call Jan](https://www.ruby-forum.com/t/dev-call-jan/233837)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 15, 2015, 6:59pm UTC](https://www.ruby-forum.com/t/dev-call-jan/233837 "2015-01-15T18:59:06Z")
Hey guys, dev call January starts soon, if you want to join, ping me in IRC. Cheers, M --- ## [Re: gr-cdma](https://www.ruby-forum.com/t/re-gr-cdma/233832)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 15, 2015, 5:15pm UTC](https://www.ruby-forum.com/t/re-gr-cdma/233832 "2015-01-15T17:15:07Z")
There is no such instruction to be executed! Please read the README.md file and let us know which one of the detailed instructions mentioned there you don’t know how to execute. Achilles On Thu, Jan 15, 2015 at 10:52… --- ## [Re: gr-cdma](https://www.ruby-forum.com/t/re-gr-cdma/233822)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 15, 2015, 4:54pm UTC](https://www.ruby-forum.com/t/re-gr-cdma/233822 "2015-01-15T16:54:15Z")
Please follow the detailed instructions on the README.md file and let us know which of these does not work for you (or which of these instructions you don’t know how to execute). best Achilleas --- ## [Stop xmlrpc server](https://www.ruby-forum.com/t/stop-xmlrpc-server/233827)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 15, 2015, 10:46am UTC](https://www.ruby-forum.com/t/stop-xmlrpc-server/233827 "2015-01-15T10:46:10Z")
Hi, When I add an xmlrpc server block in GnuRadio 3.7.5, I’m not able to stop the flow graph pressing Enter any more. I have to manually add the shutdown call to the server in the generated script (see below). Am I … --- ## [Re: FATAL: No supported device found](https://www.ruby-forum.com/t/re-fatal-no-supported-device-found/233817)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 14, 2015, 10:36pm UTC](https://www.ruby-forum.com/t/re-fatal-no-supported-device-found/233817 "2015-01-14T22:36:31Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Re: FATAL: No supported device found](https://www.ruby-forum.com/t/re-fatal-no-supported-device-found/233812)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 2\ **Last updated:** [January 14, 2015, 6:55pm UTC](https://www.ruby-forum.com/t/re-fatal-no-supported-device-found/233812 "2015-01-14T18:55:46Z")
Discuss-gnuradio mailing list removed\_email\_address@domain.invalid https://lists.gnu.org/mailman/listinfo/discuss-gnuradio --- ## [Re: b210 overflows and huge usb buffer](https://www.ruby-forum.com/t/re-b210-overflows-and-huge-usb-buffer/233813)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 0\ **Last updated:** [January 14, 2015, 5:39pm UTC](https://www.ruby-forum.com/t/re-b210-overflows-and-huge-usb-buffer/233813 "2015-01-14T17:39:50Z")
"I managed to find a solution to this. I create a ram filesystem (tmpfs) and dump fixed length files there with gnuradio. I then move the files when they are complete to a persistent drive using another script. I don’… --- ## [Broadband Applications with USRP](https://www.ruby-forum.com/t/broadband-applications-with-usrp/233332)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [January 14, 2015, 4:46pm UTC](https://www.ruby-forum.com/t/broadband-applications-with-usrp/233332 "2015-01-14T16:46:21Z")
Hello Everyone, I am interested in developing broadband applications (~30MHZ BW) using the USRP and I have some questions: What is the largest bandwidth I can process using a flow graph with relatively large compl… --- ## [Distorted QPSK Constellation](https://www.ruby-forum.com/t/distorted-qpsk-constellation/233804)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [January 14, 2015, 3:24pm UTC](https://www.ruby-forum.com/t/distorted-qpsk-constellation/233804 "2015-01-14T15:24:19Z")
Hi to all, I am a beginner in using GNU radio(GRC). I have made a DQPSK transmitter using the blocks of GNU radio (attached Figure QPSK\_1). when I connected the constellation plot with it, It gave me the a very scatte… --- ## [FATAL: No supported device found](https://www.ruby-forum.com/t/fatal-no-supported-device-found/233803)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 1\ **Last updated:** [January 13, 2015, 11:27pm UTC](https://www.ruby-forum.com/t/fatal-no-supported-device-found/233803 "2015-01-13T23:27:13Z")
Hi, Bananapi / LUbuntu After building GNURadio with the build-script and compiling / installing with success i can start gnuradio-companion or any gnuradio based py application but i get the following error messages. … [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=37) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=39)