# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=3 [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:** 4 --- ## [DBPSK transmission and reception of text file](https://www.ruby-forum.com/t/dbpsk-transmission-and-reception-of-text-file/252719)
**Author:** [@varvarip](https://www.ruby-forum.com/u/varvarip)\ **Replies:** 0\ **Last updated:** [July 15, 2019, 8:41pm UTC](https://www.ruby-forum.com/t/dbpsk-transmission-and-reception-of-text-file/252719 "2019-07-15T20:41:27Z")
Hello everyone! I am setting up the following GNURadio algorithm to send and receive data from a text file. If I don’t use TX-RX and simply connect the DPSK Mod block to Costas Loop the system works perfectly. So I must … --- ## [GNU RADIO on WIndows 10](https://www.ruby-forum.com/t/gnu-radio-on-windows-10/252676)
**Author:** [@sonu.deepu](https://www.ruby-forum.com/u/sonu.deepu)\ **Replies:** 0\ **Last updated:** [July 7, 2019, 8:29am UTC](https://www.ruby-forum.com/t/gnu-radio-on-windows-10/252676 "2019-07-07T08:29:51Z")
I am using the windows platform for using the GNU radio HACKRF One gadget. I have made a simple application for the FM receiver but I am getting the following error. Executing: C:\\Program Files\\GNURadio-3.7\\gr-python2… --- ## [GNU RADIO on LINUX on VMWorkstation](https://www.ruby-forum.com/t/gnu-radio-on-linux-on-vmworkstation/252675)
**Author:** [@sonu.deepu](https://www.ruby-forum.com/u/sonu.deepu)\ **Replies:** 0\ **Last updated:** [July 7, 2019, 7:45am UTC](https://www.ruby-forum.com/t/gnu-radio-on-linux-on-vmworkstation/252675 "2019-07-07T07:45:31Z")
I am using Skywave OS in VMworkstation for using the GNU radio. I am a beginner. I have made the flowgraph but there are lot of error are coming and I think the source is not coming. below is the list of mesages which ha… --- ## [Help getting accurate AWGN SNR values](https://www.ruby-forum.com/t/help-getting-accurate-awgn-snr-values/252647)
**Author:** [@VladFomitchev](https://www.ruby-forum.com/u/VladFomitchev)\ **Replies:** 0\ **Last updated:** [July 2, 2019, 5:51pm UTC](https://www.ruby-forum.com/t/help-getting-accurate-awgn-snr-values/252647 "2019-07-02T17:51:57Z")
Hello, I have been trying to create a simulation with some basic PSK signals at varying SNR values by separately generating a signal and gaussian noise and adding them together. I am however having an issue at lower SNR… --- ## [Obtain hidden information from blocks](https://www.ruby-forum.com/t/obtain-hidden-information-from-blocks/252635)
**Author:** [@Dyla2n](https://www.ruby-forum.com/u/Dyla2n)\ **Replies:** 0\ **Last updated:** [June 30, 2019, 9:33am UTC](https://www.ruby-forum.com/t/obtain-hidden-information-from-blocks/252635 "2019-06-30T09:33:36Z")
Hello, I am using GNURadio and I would like to obtain different pieces of information that blocks have. For example, the “PLL Carrier Tracking” is a block that will center on the carrier frequency. In GRC I cannot obtai… --- ## [GNU Radio - separating Left and Right channels in Audio sink](https://www.ruby-forum.com/t/gnu-radio-separating-left-and-right-channels-in-audio-sink/252632)
**Author:** [@vinaygb](https://www.ruby-forum.com/u/vinaygb)\ **Replies:** 0\ **Last updated:** [June 29, 2019, 3:52am UTC](https://www.ruby-forum.com/t/gnu-radio-separating-left-and-right-channels-in-audio-sink/252632 "2019-06-29T03:52:48Z")
Is it possible to send two different streams to Audio Sink - one on Left and one on Right channel ? If possible how to do this? regards, vinaygb --- ## [USRP gain changing in runtime: the codes](https://www.ruby-forum.com/t/usrp-gain-changing-in-runtime-the-codes/252512)
**Author:** [@hamid\_zargari](https://www.ruby-forum.com/u/hamid_zargari)\ **Replies:** 0\ **Last updated:** [May 31, 2019, 2:31pm UTC](https://www.ruby-forum.com/t/usrp-gain-changing-in-runtime-the-codes/252512 "2019-05-31T14:31:40Z")
Dear all, I am a beginner and I am searching to find a way to change the gain of rx block in USRP1, but in the run time. I want to put a loop and change the gain step by step. I am working on a tweaked software and I c… --- ## [Embedded Python Block issue with templet](https://www.ruby-forum.com/t/embedded-python-block-issue-with-templet/252274)
**Author:** [@ashish7724](https://www.ruby-forum.com/u/ashish7724)\ **Replies:** 0\ **Last updated:** [April 18, 2019, 11:18am UTC](https://www.ruby-forum.com/t/embedded-python-block-issue-with-templet/252274 "2019-04-18T11:18:19Z")
After going through google search I found that Embedded Python block can be used to create GNU block from python code. When I add this block and open in text editor I found the template was empty. I opened it in Pycharm… --- ## [Audio Source issue on windows 10](https://www.ruby-forum.com/t/audio-source-issue-on-windows-10/252264)
**Author:** [@ashish7724](https://www.ruby-forum.com/u/ashish7724)\ **Replies:** 0\ **Last updated:** [April 17, 2019, 11:26am UTC](https://www.ruby-forum.com/t/audio-source-issue-on-windows-10/252264 "2019-04-17T11:26:42Z")
Hello, I am trying to use FM transmitter for wav file as well as for audio source. With wav file I am able to receive at other end on selected band. But when I try to replace wav file source to audio source nothing happ… --- ## [Export max\_hold from QTGUI Frequency Sink](https://www.ruby-forum.com/t/export-max-hold-from-qtgui-frequency-sink/252258)
**Author:** [@user123456789](https://www.ruby-forum.com/u/user123456789)\ **Replies:** 0\ **Last updated:** [April 16, 2019, 2:56pm UTC](https://www.ruby-forum.com/t/export-max-hold-from-qtgui-frequency-sink/252258 "2019-04-16T14:56:53Z")
Hello, I am using QTGUI Frequency Sink to calculate a real time spectrum and I want to export the max\_hold facility to a file/vector. Where can I find the data I want and how can I use it? Thanks! --- ## [Terminate called after throwing an instance of 'std::invalid\_argument'](https://www.ruby-forum.com/t/terminate-called-after-throwing-an-instance-of-std-invalid-argument/242292)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 4\ **Last updated:** [April 3, 2019, 12:12pm UTC](https://www.ruby-forum.com/t/terminate-called-after-throwing-an-instance-of-std-invalid-argument/242292 "2019-04-03T12:12:51Z")
Hello Everyone When I run AM radio GRC, I got this error terminate called after throwing an instance of ‘std::invalid\_argument’ what(): buffer\_add\_reader: nzero\_preload must be \>= 0 I google this error, and it says … --- ## [DAB TX using GRC & USRP B210](https://www.ruby-forum.com/t/dab-tx-using-grc-usrp-b210/252153)
**Author:** [@likhil](https://www.ruby-forum.com/u/likhil)\ **Replies:** 0\ **Last updated:** [March 27, 2019, 1:16pm UTC](https://www.ruby-forum.com/t/dab-tx-using-grc-usrp-b210/252153 "2019-03-27T13:16:04Z")
Hi I was trying to do DAB TX flowgraph…what are the specifications to be followed for MPEG audio file?..& whether DAB radio receiver will scan only the standard channel frequencies or the complete DAB spectrum? --- ## [FLL Band-Edge Detectors: Literature?](https://www.ruby-forum.com/t/fll-band-edge-detectors-literature/223356)
**Author:** [@aris](https://www.ruby-forum.com/u/aris)\ **Replies:** 5\ **Last updated:** [March 17, 2019, 4:15pm UTC](https://www.ruby-forum.com/t/fll-band-edge-detectors-literature/223356 "2019-03-17T16:15:59Z")
Hi, is there any literature that goes with the FLL synch blocks in gr-digital? Ironically, Google always points me to the GR source files when I search for ‘fll band edge’ related topics. M – Karlsruhe Institute of… --- ## [SDR - GRC blocks for Z-Wave (9.6Kbps, FSK and Manchester decoding)](https://www.ruby-forum.com/t/sdr-grc-blocks-for-z-wave-9-6kbps-fsk-and-manchester-decoding/252072)
**Author:** [@halfdeadpie](https://www.ruby-forum.com/u/halfdeadpie)\ **Replies:** 0\ **Last updated:** [March 13, 2019, 12:19pm UTC](https://www.ruby-forum.com/t/sdr-grc-blocks-for-z-wave-9-6kbps-fsk-and-manchester-decoding/252072 "2019-03-13T12:19:28Z")
Hello guys, IoT protocol Z-Wave transmits on set: 9.6Kbps | FSK | Manchester coding set: 40Kbps | FSK | NRZ coding set 100Kbps | GFSK | NRZ coding I’ve used scapy-radio for receiving Z-Wave f… --- ## [Can GNU radio be used for Frequency Hopping transmission?](https://www.ruby-forum.com/t/can-gnu-radio-be-used-for-frequency-hopping-transmission/84769)
**Author:** [@nilay\_shah](https://www.ruby-forum.com/u/nilay_shah)\ **Replies:** 3\ **Last updated:** [October 29, 2018, 6:51pm UTC](https://www.ruby-forum.com/t/can-gnu-radio-be-used-for-frequency-hopping-transmission/84769 "2018-10-29T18:51:53Z")
Does anyone has example how to do continuouls frequency hopping transmission using GNURadio? -Nilay --- ## [GNU radio, gr\_modtool](https://www.ruby-forum.com/t/gnu-radio-gr-modtool/251946)
**Author:** [@aravinddeshikh](https://www.ruby-forum.com/u/aravinddeshikh)\ **Replies:** 0\ **Last updated:** [February 21, 2019, 11:14pm UTC](https://www.ruby-forum.com/t/gnu-radio-gr-modtool/251946 "2019-02-21T23:14:05Z")
Hi, I’m trying to write a block for spectrum sensing in Gnu Radio using gr\_modtool. I have a python code using LSTM (machine learning) model of about 10-15 classes to convert the data into binary, reshape, sort, train a… --- ## [About signal process window design?](https://www.ruby-forum.com/t/about-signal-process-window-design/207503)
**Author:** [@luislavena](https://www.ruby-forum.com/u/luislavena)\ **Replies:** 0\ **Last updated:** [May 27, 2011, 3:20am UTC](https://www.ruby-forum.com/t/about-signal-process-window-design/207503 "2011-05-27T03:20:56Z")
Hi all: When I try to implement some spectrum estimate algorithm encounter a problem like this hope some one can help me out ,cause I really don’t understand how to design the window in window.py which I have post be… --- ## [How to specify 'device name' of audio sink in gnu radio (Windows)](https://www.ruby-forum.com/t/how-to-specify-device-name-of-audio-sink-in-gnu-radio-windows/251905)
**Author:** [@macredb](https://www.ruby-forum.com/u/macredb)\ **Replies:** 0\ **Last updated:** [February 15, 2019, 11:15am UTC](https://www.ruby-forum.com/t/how-to-specify-device-name-of-audio-sink-in-gnu-radio-windows/251905 "2019-02-15T11:15:34Z")
How to specify ‘device name’ of audio sink in gnu radio in Windows? I tryed a lot variants (for example HW:1,0) but always got a message: ‘INFO: Warning: waveOut device ‘HW:1,0’ was not found, defaulting to WAVE\_MAPPER’ … --- ## [Obtaining power over time with GNU radio](https://www.ruby-forum.com/t/obtaining-power-over-time-with-gnu-radio/251733)
**Author:** [@Dan889](https://www.ruby-forum.com/u/Dan889)\ **Replies:** 0\ **Last updated:** [January 24, 2019, 12:25pm UTC](https://www.ruby-forum.com/t/obtaining-power-over-time-with-gnu-radio/251733 "2019-01-24T12:25:37Z")
Hello, I recorded a signal to a file using a SDR device and GNUradio. The file is complex binary file. I would like to obtain from this file the power of the signal (in dBm) over time. How can I save this data using G… --- ## [TDMA in GNU radio using usrp N210](https://www.ruby-forum.com/t/tdma-in-gnu-radio-using-usrp-n210/251713)
**Author:** [@Ayeka](https://www.ruby-forum.com/u/Ayeka)\ **Replies:** 0\ **Last updated:** [January 22, 2019, 11:16am UTC](https://www.ruby-forum.com/t/tdma-in-gnu-radio-using-usrp-n210/251713 "2019-01-22T11:16:35Z")
I am searching for a solution to incorporate Time division multiple access TDMA using usrp N210 and gnu radio. Is there any possible way to achieve it in which I am allowed to transmit entirely different information at 3… --- ## [How to close some ports opened by the gnuradio flowgraph?](https://www.ruby-forum.com/t/how-to-close-some-ports-opened-by-the-gnuradio-flowgraph/251471)
**Author:** [@user123456789](https://www.ruby-forum.com/u/user123456789)\ **Replies:** 0\ **Last updated:** [December 21, 2018, 10:36am UTC](https://www.ruby-forum.com/t/how-to-close-some-ports-opened-by-the-gnuradio-flowgraph/251471 "2018-12-21T10:36:19Z")
I am designing some flowgraphs in gnuradio and then I am generating the python code. In this code I want to close all the sockets opened by the top\_block\_class instance (rpc and zmq sockets) to make a new object that can… --- ## [OpenBTS in VMware-machine](https://www.ruby-forum.com/t/openbts-in-vmware-machine/236319)
**Author:** [@alcina](https://www.ruby-forum.com/u/alcina)\ **Replies:** 0\ **Last updated:** [August 26, 2013, 2:15pm UTC](https://www.ruby-forum.com/t/openbts-in-vmware-machine/236319 "2013-08-26T14:15:50Z")
Hi, At the moment I am stuck with trying to install OpenBTS in an VMware environment, while the “real thing” is a Windows 8 PC. Everything installs and compiles just fine, the USRP gets set to the assigned frequency,… --- ## [OSM3D: OpenStreetMap + blender + GnuRadio/OpenBTS/USRP = 3d mapping project for community-based tran](https://www.ruby-forum.com/t/osm3d-openstreetmap-blender-gnuradio-openbts-usrp-3d-mapping-project-for-community-based-tran/191239)
**Author:** [@Abdalaleem\_Andy\_Jam](https://www.ruby-forum.com/u/Abdalaleem_Andy_Jam)\ **Replies:** 1\ **Last updated:** [November 28, 2018, 9:51am UTC](https://www.ruby-forum.com/t/osm3d-openstreetmap-blender-gnuradio-openbts-usrp-3d-mapping-project-for-community-based-tran/191239 "2018-11-28T09:51:47Z")
Dear All, I would like to announce a project I am working on, for augmented reality 3d geospatial transactions over GSM/Wifi. By adding to OpenStreetMap with 3d models of an environment, and sending this 3d represent… --- ## [Wrong when I run uhd\_fft](https://www.ruby-forum.com/t/wrong-when-i-run-uhd-fft/251171)
**Author:** [@tony41](https://www.ruby-forum.com/u/tony41)\ **Replies:** 0\ **Last updated:** [November 26, 2018, 3:09am UTC](https://www.ruby-forum.com/t/wrong-when-i-run-uhd-fft/251171 "2018-11-26T03:09:49Z")
Hello When I run uhd\_fft and I get errors below,what should I do next ? I’ve tried adding libUHD to the LD\_LIBRARY\_PATH，and ldconfig, but this error still exists. tjf@tjf:~$ uhd\_fft Traceback (most recent call last): … --- ## [Get value from work method](https://www.ruby-forum.com/t/get-value-from-work-method/251089)
**Author:** [@user123456789](https://www.ruby-forum.com/u/user123456789)\ **Replies:** 0\ **Last updated:** [November 19, 2018, 12:47pm UTC](https://www.ruby-forum.com/t/get-value-from-work-method/251089 "2018-11-19T12:47:50Z")
Hello How can I get a value calculated in def work(self, input\_items, output\_items) and use it in a getter method? Until now, I defined a self.value but it does not change. I attached a capture containing my code. … --- ## [Add in embedded python block other embedded python block](https://www.ruby-forum.com/t/add-in-embedded-python-block-other-embedded-python-block/251070)
**Author:** [@user123456789](https://www.ruby-forum.com/u/user123456789)\ **Replies:** 0\ **Last updated:** [November 16, 2018, 9:19am UTC](https://www.ruby-forum.com/t/add-in-embedded-python-block-other-embedded-python-block/251070 "2018-11-16T09:19:10Z")
Hello, I have developed an embedded python block in which I would like to import some files (other embedded python block) in order to avoid rewriting the existing code. I have already tried “import /path/file\_name”, b… --- ## [DVB-T using limesdr-USB and limesdr-mini](https://www.ruby-forum.com/t/dvb-t-using-limesdr-usb-and-limesdr-mini/251023)
**Author:** [@sasisneha](https://www.ruby-forum.com/u/sasisneha)\ **Replies:** 0\ **Last updated:** [November 13, 2018, 10:36am UTC](https://www.ruby-forum.com/t/dvb-t-using-limesdr-usb-and-limesdr-mini/251023 "2018-11-13T10:36:45Z")
I am trying to transfer a video by dvb-t using limesdr for past two months,but i am not able to do it successfully. I tried using all possible blocks but then the constellation which i get on receiver side is not same l… --- ## [Set image from computer as a background for QT GUI](https://www.ruby-forum.com/t/set-image-from-computer-as-a-background-for-qt-gui/250998)
**Author:** [@user123456789](https://www.ruby-forum.com/u/user123456789)\ **Replies:** 1\ **Last updated:** [November 12, 2018, 10:25pm UTC](https://www.ruby-forum.com/t/set-image-from-computer-as-a-background-for-qt-gui/250998 "2018-11-12T22:25:27Z")
Hello, I would like display a value over a custom background in gnu radio. In fact, the code should print the value somehow like a speedometer on semi-round. How can I achieve this? Is it possible to implement my idea i… --- ## [Set input length for embedded python block in gnu radio](https://www.ruby-forum.com/t/set-input-length-for-embedded-python-block-in-gnu-radio/250932)
**Author:** [@user123456789](https://www.ruby-forum.com/u/user123456789)\ **Replies:** 1\ **Last updated:** [November 10, 2018, 9:21am UTC](https://www.ruby-forum.com/t/set-input-length-for-embedded-python-block-in-gnu-radio/250932 "2018-11-10T09:21:21Z")
Hello, I am having a "Stream to Vector " block which gives me 10 complex elements for another custom embedded block. How can I set the input type and length for my ambedded block to merge the size? I have already tried … --- ## [Convert from Complex integer 8 to Byte or Float format](https://www.ruby-forum.com/t/convert-from-complex-integer-8-to-byte-or-float-format/250988)
**Author:** [@Sami1](https://www.ruby-forum.com/u/Sami1)\ **Replies:** 0\ **Last updated:** [November 10, 2018, 9:15am UTC](https://www.ruby-forum.com/t/convert-from-complex-integer-8-to-byte-or-float-format/250988 "2018-11-10T09:15:55Z")
Hi everyone, Could any one know the conversion from RS\_Decoder (complex int8) format to for ex. file sink (char. or float)? Thanks [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=2) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=4)