# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=4 [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:** 5 --- ## [Problem receiving packetized data with QPSK and higher modulations using benchmark\_rx.py](https://www.ruby-forum.com/t/problem-receiving-packetized-data-with-qpsk-and-higher-modulations-using-benchmark-rx-py/244987)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [July 25, 2016, 6:01pm UTC](https://www.ruby-forum.com/t/problem-receiving-packetized-data-with-qpsk-and-higher-modulations-using-benchmark-rx-py/244987 "2016-07-25T18:01:37Z")
Hello all, I am having a problem receiving packetized data with the benchmark\_rx.py file. For reference I am not using the benchmark\_tx.py file, I created my own transmit file in which transmits packetized data. When … --- ## [Errors when lunching Gnuradio-Companion](https://www.ruby-forum.com/t/errors-when-lunching-gnuradio-companion/244983)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [July 23, 2016, 5:55pm UTC](https://www.ruby-forum.com/t/errors-when-lunching-gnuradio-companion/244983 "2016-07-23T17:55:43Z")
Hi folks, I am new user and trying to run gnuradio under Ubuntu. I am not an Ubuntu and gnuradio user but I am trying to Run a program that uses gnuradio. When I run gnuradio-companion, I get the following errors Ei… --- ## [QWidget: Must construct a QApplication before a QPaintDevice](https://www.ruby-forum.com/t/qwidget-must-construct-a-qapplication-before-a-qpaintdevice/244977)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [July 21, 2016, 11:37pm UTC](https://www.ruby-forum.com/t/qwidget-must-construct-a-qapplication-before-a-qpaintdevice/244977 "2016-07-21T23:37:18Z")
HI, I am new to GNUradio. I have run into a problem when i tried to run a gnuradio python file but the GUI didn’t start. Below is the output. Executing: /usr/bin/python2 -u /home/champly/gr-ieee802-11/examples/wifi\_l… --- ## [Creating blocks in C/C++ and debugging created flowgraphs GNU Radio](https://www.ruby-forum.com/t/creating-blocks-in-c-c-and-debugging-created-flowgraphs-gnu-radio/244975)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [July 21, 2016, 8:06pm UTC](https://www.ruby-forum.com/t/creating-blocks-in-c-c-and-debugging-created-flowgraphs-gnu-radio/244975 "2016-07-21T20:06:23Z")
Hi I am a begginer with python and GNU Radio. Sometimes I do not know how my system is working (or not) and I am wondering whether there is any chance to debug my system created in GNU Radio for example like in Eclip… --- ## [USRP MIMO-OFDM cannot receive packet](https://www.ruby-forum.com/t/usrp-mimo-ofdm-cannot-receive-packet/244968)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [July 20, 2016, 2:26pm UTC](https://www.ruby-forum.com/t/usrp-mimo-ofdm-cannot-receive-packet/244968 "2016-07-20T14:26:49Z")
Recently,I build the 2x2 mimo-ofdm system with only mimo cable.The transmitting end can successful the packet,while the send end can only do coarse freq1 and freq2 estimation,sometimes could receiver one or two packet… --- ## [HackRF 2.4GHz](https://www.ruby-forum.com/t/hackrf-2-4ghz/244964)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [July 19, 2016, 11:11am UTC](https://www.ruby-forum.com/t/hackrf-2-4ghz/244964 "2016-07-19T11:11:40Z")
Hi all, I’ve bought a HackRF and been playing around with it, but I thought maybe someone could help me out with something. I’m trying to replicate this ‘hack’, but then with the XN297 transceiver chip: http://blog.p… --- ## [Gnu Radio independent 802.11 based MAC program](https://www.ruby-forum.com/t/gnu-radio-independent-802-11-based-mac-program/244941)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [July 14, 2016, 3:44pm UTC](https://www.ruby-forum.com/t/gnu-radio-independent-802-11-based-mac-program/244941 "2016-07-14T15:44:53Z")
Good afternoon, I am interested to make 802.11 based MAC using Gnu radio. I want to make at the end an integration with 802.11 PHY implemented using LabVIEW. Could you please briefly explain if it is possible to make… --- ## [UHD USRP2 full duplex mystery solved](https://www.ruby-forum.com/t/uhd-usrp2-full-duplex-mystery-solved/194988)
**Author:** [@meckart](https://www.ruby-forum.com/u/meckart)\ **Replies:** 15\ **Last updated:** [July 6, 2016, 2:18pm UTC](https://www.ruby-forum.com/t/uhd-usrp2-full-duplex-mystery-solved/194988 "2016-07-06T14:18:39Z")
I’ve been attempting to do a full duplex send/recv using UHD on a USRP2 with an XCVR2450. The major problem I had was that issue\_stream\_cmd nearly always resulted in a runtime error of “usrp2 no control response”. It … --- ## [Noise received](https://www.ruby-forum.com/t/noise-received/244878)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [June 30, 2016, 6:12pm UTC](https://www.ruby-forum.com/t/noise-received/244878 "2016-06-30T18:12:20Z")
Hi everyone, I am trying to tx and rx a binary file using USRP B210. The GUI sink at transmitters side shows a regular LTE signal. However, at receivers side, I am getting a lot of noise and the signal is hardly visib… --- ## [Capture finite number of samples](https://www.ruby-forum.com/t/capture-finite-number-of-samples/244832)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [June 22, 2016, 5:25pm UTC](https://www.ruby-forum.com/t/capture-finite-number-of-samples/244832 "2016-06-22T17:25:30Z")
Hi everybody. I’m working in gnu-radio and I must to save a finite number of samples, to do that I’m using a file sink block, and it do it fine, but I don’t understand why the samples are saving at the end of the sign… --- ## [Saving several files in the same flow graph](https://www.ruby-forum.com/t/saving-several-files-in-the-same-flow-graph/244831)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [June 22, 2016, 5:20pm UTC](https://www.ruby-forum.com/t/saving-several-files-in-the-same-flow-graph/244831 "2016-06-22T17:20:49Z")
Morning, I’m working with gnu-radio, and I’ve been modified the python code to save a file, but I’m having a problem with this, because I have to kill the flowgraph to save another file, and I want to save in several … --- ## [Segmentation fault in narrowband benchmark\_rx.py](https://www.ruby-forum.com/t/segmentation-fault-in-narrowband-benchmark-rx-py/239449)
**Author:** [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Replies:** 9\ **Last updated:** [June 22, 2016, 2:37pm UTC](https://www.ruby-forum.com/t/segmentation-fault-in-narrowband-benchmark-rx-py/239449 "2016-06-22T14:37:35Z")
Hello Everyone, Not sure if this is already discussed here. I am facing segmentation fault when running benchmark\_rx in narrowband examples. It seems like those example used to work fine before, but now they are havi… --- ## [Warning: restarting the docstring loader (crashed while loading 'uhd\_usrp\_sink')](https://www.ruby-forum.com/t/warning-restarting-the-docstring-loader-crashed-while-loading-uhd-usrp-sink/244823)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [June 21, 2016, 4:42pm UTC](https://www.ruby-forum.com/t/warning-restarting-the-docstring-loader-crashed-while-loading-uhd-usrp-sink/244823 "2016-06-21T16:42:23Z")
Hi, I recently installed the latest version of Gnuradio (v3.7.9.2-279-gd7eaf6e1) using the following procedure: sudo apt-get install git sudo apt-get install cmake sudo apt-get install python-pip sudo pip install -… --- ## [N210 halts after sometime while running](https://www.ruby-forum.com/t/n210-halts-after-sometime-while-running/244822)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [June 21, 2016, 10:56am UTC](https://www.ruby-forum.com/t/n210-halts-after-sometime-while-running/244822 "2016-06-21T10:56:50Z")
I am sending some AM modulated signal, Sampling Frequency: 200k at a center frequency of 2.41GHz since my laptop was not having inbuilt Gigabit Ethernet, hence I am using a USB 3.0 to GBe Ethernet convertor ( ASIX AX… --- ## [Simulating/Learning about poly phase clock recovery](https://www.ruby-forum.com/t/simulating-learning-about-poly-phase-clock-recovery/244821)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [June 21, 2016, 8:30am UTC](https://www.ruby-forum.com/t/simulating-learning-about-poly-phase-clock-recovery/244821 "2016-06-21T08:30:06Z")
Hi, I’m trying to learn about software defined radio, obviously, and writing the necessary code to do so - I like to prove concepts to myself by simulating them in Matlab, or Python. I run into trouble when it comes … --- ## [Audio underruns - Sending signals over audio](https://www.ruby-forum.com/t/audio-underruns-sending-signals-over-audio/244803)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [June 17, 2016, 6:15pm UTC](https://www.ruby-forum.com/t/audio-underruns-sending-signals-over-audio/244803 "2016-06-17T18:15:35Z")
Hi, I’m getting frequent audio underruns and I can’t figure out why. I’m trying to transmit data over audio signals based on \[1\] in an uncontinuous way, as i’m using packets. The problem is that after a while I get c… --- ## [Question on USRP about differential IQ signals](https://www.ruby-forum.com/t/question-on-usrp-about-differential-iq-signals/244784)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [June 14, 2016, 12:41am UTC](https://www.ruby-forum.com/t/question-on-usrp-about-differential-iq-signals/244784 "2016-06-14T00:41:13Z")
Hi, One quick question is about USRP and BasicTX and BasicRX: Can we generate four differential IQ signals using 2 BasicTX and receive four differential IQ signals using 2 BasicRX? Thanks, Ralph --- ## [USRP Spectrum Sensing - Power in dB or dBm?](https://www.ruby-forum.com/t/usrp-spectrum-sensing-power-in-db-or-dbm/244748)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [June 7, 2016, 12:52pm UTC](https://www.ruby-forum.com/t/usrp-spectrum-sensing-power-in-db-or-dbm/244748 "2016-06-07T12:52:12Z")
I’m a beginner working in Spectrum Sensing. I have been checking the code given in the usrp\_spectrum\_sense.py file in GNU Radio. (https://github.com/gnuradio/gnuradio/blob/master/gr-uhd/examples/python/usrp\_spectrum\_se… --- ## [Building gr-osmosdr in GNU Radio Companion on Windows](https://www.ruby-forum.com/t/building-gr-osmosdr-in-gnu-radio-companion-on-windows/243037)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 3\ **Last updated:** [June 7, 2016, 11:56am UTC](https://www.ruby-forum.com/t/building-gr-osmosdr-in-gnu-radio-companion-on-windows/243037 "2016-06-07T11:56:36Z")
I installed GNU Radio Companion on Windows using these steps. http://code.ettus.com/redmine/ettus/projects/uhd/wiki/GNURadio\_Windows?version=94 I have a RTL2832U and as I’ve researched, you can intstall a block for th… --- ## [How to add RTL\_SDR Source block to gnuRadio windows](https://www.ruby-forum.com/t/how-to-add-rtl-sdr-source-block-to-gnuradio-windows/244747)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [June 7, 2016, 11:51am UTC](https://www.ruby-forum.com/t/how-to-add-rtl-sdr-source-block-to-gnuradio-windows/244747 "2016-06-07T11:51:20Z")
I installed GNU Radio Companion on Windows And I want to use rtlsdr but i can not find RTL\_SDR Source block. --- ## [2x2 mimo with USRP N210](https://www.ruby-forum.com/t/2x2-mimo-with-usrp-n210/244742)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [June 7, 2016, 4:44am UTC](https://www.ruby-forum.com/t/2x2-mimo-with-usrp-n210/244742 "2016-06-07T04:44:20Z")
Hello,everyone,I want to implement 2x2 MIMO system with beam-forming in GNU-radio,the devices I use are usrp N210 and mimo cable, while I’m a beginner in GNU-radio,could anyone who implemented this relative system ex… --- ## [BPSK Signal in GNURadio](https://www.ruby-forum.com/t/bpsk-signal-in-gnuradio/244669)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [May 24, 2016, 4:34am UTC](https://www.ruby-forum.com/t/bpsk-signal-in-gnuradio/244669 "2016-05-24T04:34:02Z")
Hello, I try to make a BPSK Signal from GNURadio and face some problem. Look at the DPSK\_Output picture that I’ve attached, why there are harmonic frequency in the DPSK block output signal that make the DPSK block … --- ## [Problem to recover data DBPSK](https://www.ruby-forum.com/t/problem-to-recover-data-dbpsk/244590)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [May 9, 2016, 3:42pm UTC](https://www.ruby-forum.com/t/problem-to-recover-data-dbpsk/244590 "2016-05-09T15:42:57Z")
Hello, I am trying to demodulate DBPSK with a baud rate of 100 symbol/sec and I have a sample rate of 100000 samples/sec. To obtain my sample rate of 100 symbol/sec I realise a first decimation by 50 and then a second … --- ## [\-ve amplitude value in wx fft sink spectrum](https://www.ruby-forum.com/t/ve-amplitude-value-in-wx-fft-sink-spectrum/244555)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [May 3, 2016, 7:02am UTC](https://www.ruby-forum.com/t/ve-amplitude-value-in-wx-fft-sink-spectrum/244555 "2016-05-03T07:02:43Z")
Respected members I am new in GNU radio and i just want to share about one problem i came across related to the WX FFT SINK spectrum i.e. how can i get +ve amplitude values of the fft spectrum(signal amplitude)? The … --- ## [Thuraya signal reception](https://www.ruby-forum.com/t/thuraya-signal-reception/244515)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [April 25, 2016, 1:46pm UTC](https://www.ruby-forum.com/t/thuraya-signal-reception/244515 "2016-04-25T13:46:50Z")
I have been trying to receive a Thuraya signal using European 60cm flat plate antenna with LNA. I am tuning to specific frequency of a given spot using USRP N200 but I am getting very poor quality signal. What could b… --- ## [Newbie: What is gr-python27](https://www.ruby-forum.com/t/newbie-what-is-gr-python27/244505)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [April 22, 2016, 5:22pm UTC](https://www.ruby-forum.com/t/newbie-what-is-gr-python27/244505 "2016-04-22T17:22:39Z")
Hi, I am new to GNU Radio. I installed it on Windows (8, 64bit) using gnuradio\_3.7.9.2\_win64.msi. The installation went smoothly. After that, I found a directory named gr-python27. Is it different from “regular” Pyth… --- ## [New to Pybombs 2 help](https://www.ruby-forum.com/t/new-to-pybombs-2-help/244471)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [April 17, 2016, 2:13pm UTC](https://www.ruby-forum.com/t/new-to-pybombs-2-help/244471 "2016-04-17T14:13:14Z")
I’ve come back to using Linux (Kali) and was looking to install Pybombs again to use Gnuradio. I notice there’s been some updates and I’ve installed PYbombs 2 via PIP as instructed on the Github site. When I run ‘Pybo… --- ## [A couple of questions for you](https://www.ruby-forum.com/t/a-couple-of-questions-for-you/244464)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 0\ **Last updated:** [April 15, 2016, 11:00am UTC](https://www.ruby-forum.com/t/a-couple-of-questions-for-you/244464 "2016-04-15T11:00:45Z")
Greetings all, I recently began using GnuRadio and GRC, and I have some doubt that hope you can explain. It is possible to modify the QT or WX GUI by adding some pushbutton. I know that I can add sliders, static te… --- ## [Attribute error](https://www.ruby-forum.com/t/attribute-error/244399)
**Author:** [@Sadaf\_N](https://www.ruby-forum.com/u/Sadaf_N)\ **Replies:** 0\ **Last updated:** [April 4, 2016, 7:39pm UTC](https://www.ruby-forum.com/t/attribute-error/244399 "2016-04-04T19:39:16Z")
Hi all, I’m trying to create a new block by C++ coding and the coding part seems to be alright! Infact my new block appears in GNU radio, but when I connect and other blocks and run the GRC flowgraph, an error comes … --- ## [Is here a way to use a rtl-sdr with direct sampling mod on GNU Radio](https://www.ruby-forum.com/t/is-here-a-way-to-use-a-rtl-sdr-with-direct-sampling-mod-on-gnu-radio/243381)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 1\ **Last updated:** [February 24, 2016, 10:56pm UTC](https://www.ruby-forum.com/t/is-here-a-way-to-use-a-rtl-sdr-with-direct-sampling-mod-on-gnu-radio/243381 "2016-02-24T22:56:59Z")
Hello, I have a pre modified rtl-sdr like this http://www.ebay.de/itm/like/400846220428?ul\_noapp=true&chn=ps&lpid=106 which can receive vhf and shortwave directly. On windows shortwave listening works fine with hdsdr… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=3) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=5)