# GNU Radio **URL:** https://www.ruby-forum.com/c/gnu-radio/15.md?page=1 [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:** 2 --- ## [I can't send signal with frequency beyond sampling rate in GNuRadio](https://www.ruby-forum.com/t/i-cant-send-signal-with-frequency-beyond-sampling-rate-in-gnuradio/262362)
**Author:** [@Aaron922](https://www.ruby-forum.com/u/Aaron922)\ **Replies:** 0\ **Last updated:** [January 4, 2022, 6:45am UTC](https://www.ruby-forum.com/t/i-cant-send-signal-with-frequency-beyond-sampling-rate-in-gnuradio/262362 "2022-01-04T06:45:58Z")
I’m a student working on a FRID project about ASK modulation and demodulation. I use USRP to send and receive but when I used 915MHz sine wave as carrier and set the sampling rate as 64KHz, I found the frequency of the s… --- ## [Concatenating byte data in GNU Radio](https://www.ruby-forum.com/t/concatenating-byte-data-in-gnu-radio/262128)
**Author:** [@MubashiraZaman](https://www.ruby-forum.com/u/MubashiraZaman)\ **Replies:** 0\ **Last updated:** [November 24, 2021, 12:45pm UTC](https://www.ruby-forum.com/t/concatenating-byte-data-in-gnu-radio/262128 "2021-11-24T12:45:30Z")
I am reading a binary file from a File Source block, and am receiving some byte data from a UDP Source block. What I want to do is that I want to append the data from file source block to the end of data received in UDP … --- ## [Open Python file with GNU Radio](https://www.ruby-forum.com/t/open-python-file-with-gnu-radio/261974)
**Author:** [@Tony1](https://www.ruby-forum.com/u/Tony1)\ **Replies:** 0\ **Last updated:** [October 19, 2021, 7:53am UTC](https://www.ruby-forum.com/t/open-python-file-with-gnu-radio/261974 "2021-10-19T07:53:24Z")
Hi everyone, I’m using GNU Radio Companion recently and I would like to know if it is possible to open a Python file in GNU Radio? This Python file allows me to launch the camera of my computer and I try to stream this… --- ## [USRP N210 - No device found](https://www.ruby-forum.com/t/usrp-n210-no-device-found/231767)
**Author:** [@addis\_a](https://www.ruby-forum.com/u/addis_a)\ **Replies:** 3\ **Last updated:** [October 13, 2021, 2:09pm UTC](https://www.ruby-forum.com/t/usrp-n210-no-device-found/231767 "2021-10-13T14:09:24Z")
Hello everyone, I am using USRP for the first time. I am trying to replicate the FM Receiver found on Ettus’ YouTube channel named as: “How To Build an FM Receiver with the USRP in Less Than 10 Minutes”. The .grc f… --- ## [IQ modulation (problem with random source)](https://www.ruby-forum.com/t/iq-modulation-problem-with-random-source/261738)
**Author:** [@louloulou](https://www.ruby-forum.com/u/louloulou)\ **Replies:** 1\ **Last updated:** [August 19, 2021, 6:09pm UTC](https://www.ruby-forum.com/t/iq-modulation-problem-with-random-source/261738 "2021-08-19T18:09:29Z")
Hello, I try to study IQ modulation, so I try to simulate this modulation under gnuradio but I have some issues using the Random source to generate my binary data. I try to control the data rate coming from a random sou… --- ## [USRP.. programming the FPGA](https://www.ruby-forum.com/t/usrp-programming-the-fpga/86868)
**Author:** [@pankaj\_kumar](https://www.ruby-forum.com/u/pankaj_kumar)\ **Replies:** 5\ **Last updated:** [August 13, 2021, 10:46am UTC](https://www.ruby-forum.com/t/usrp-programming-the-fpga/86868 "2021-08-13T10:46:35Z")
Hello all, I am a student doing a project, which uses USRP board. As a first step of my project i tried to programmin the FPGA, with a verilog code. i am usin QUARTUS 2 for downloding the code, but i am not able to d… --- ## [GNU radio recording specific interval](https://www.ruby-forum.com/t/gnu-radio-recording-specific-interval/261688)
**Author:** [@DSP](https://www.ruby-forum.com/u/DSP)\ **Replies:** 0\ **Last updated:** [August 10, 2021, 1:09pm UTC](https://www.ruby-forum.com/t/gnu-radio-recording-specific-interval/261688 "2021-08-10T13:09:22Z")
Hi, i just started struggle with GNU radio with using adalm-pluto. I aim to record the 2MHz interval in FM broadcast. I tried to below flowdiagram but when i converted the output of the file sink to wav file with sox and… --- ## [FM demodulator has no viable output](https://www.ruby-forum.com/t/fm-demodulator-has-no-viable-output/261491)
**Author:** [@Labanana](https://www.ruby-forum.com/u/Labanana)\ **Replies:** 0\ **Last updated:** [July 6, 2021, 1:55pm UTC](https://www.ruby-forum.com/t/fm-demodulator-has-no-viable-output/261491 "2021-07-06T13:55:52Z")
Hello, I try to listen to a local radio (101.1MHz) with my own SDR (based on ADRV9002) set to a center frequency of 101.0MHz. I can’t find a way to get a viable demodulation information using the different FM demodulat… --- ## [Buffer too small with fft length 1024 in OFDM Transmitter](https://www.ruby-forum.com/t/buffer-too-small-with-fft-length-1024-in-ofdm-transmitter/261234)
**Author:** [@Unique\_reflection](https://www.ruby-forum.com/u/Unique_reflection)\ **Replies:** 1\ **Last updated:** [June 25, 2021, 8:02pm UTC](https://www.ruby-forum.com/t/buffer-too-small-with-fft-length-1024-in-ofdm-transmitter/261234 "2021-06-25T20:02:34Z")
Hello guys, I am currently trying to transmit data from one SDR which is HACK RF One to another using OFDM in GNURadio. I got this to work with the default fft length of 64. Now I am trying to do this with 1024 fft len… --- ## [USRP source starts to receive after certain samples](https://www.ruby-forum.com/t/usrp-source-starts-to-receive-after-certain-samples/261411)
**Author:** [@palasport](https://www.ruby-forum.com/u/palasport)\ **Replies:** 0\ **Last updated:** [June 15, 2021, 5:39pm UTC](https://www.ruby-forum.com/t/usrp-source-starts-to-receive-after-certain-samples/261411 "2021-06-15T17:39:25Z")
Hi all, I am very new to Gnuradio and USRP, and I have a question about the code transmission delay between USRPs. I have two USRP E310 with UBX160 daughterboards. I send a sequence of code from one USRP using simple a… --- ## ["Error rate" block with USRP](https://www.ruby-forum.com/t/error-rate-block-with-usrp/240490)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 10\ **Last updated:** [June 15, 2021, 2:55pm UTC](https://www.ruby-forum.com/t/error-rate-block-with-usrp/240490 "2021-06-15T14:55:50Z")
Hi All, I am working with GNU Radio Companion 3.6 on CentOS. I want to calculate the BER, so I have been using the “Error rate” block. First, I send a random QPSK-modulated signal through a simulated noisy channel (… --- ## [Wav sink problem](https://www.ruby-forum.com/t/wav-sink-problem/223256)
**Author:** [@aris](https://www.ruby-forum.com/u/aris)\ **Replies:** 14\ **Last updated:** [May 16, 2021, 5:48am UTC](https://www.ruby-forum.com/t/wav-sink-problem/223256 "2021-05-16T05:48:07Z")
Hi, i construct very simple scheme Audio Source --\> Wav Sink gr generates non-null wav file -rw-rw-r-- 1 anton anton 24M . 27 00:46 freq2.wav but when i try to play it or fetch info about file with soxi (sox plugin) … --- ## [GNU radio and SDR help](https://www.ruby-forum.com/t/gnu-radio-and-sdr-help/259044)
**Author:** [@dpmt1994](https://www.ruby-forum.com/u/dpmt1994)\ **Replies:** 1\ **Last updated:** [April 23, 2021, 8:41am UTC](https://www.ruby-forum.com/t/gnu-radio-and-sdr-help/259044 "2021-04-23T08:41:13Z")
Hi All, I’m new to gnuradio, currently I’m trying to get the SDR and Raspberry pi 4 to read I(in phase) and Q (quadrature) signals, my gnuradio block codes are shown on the images below. I’m running into errors as show… --- ## [Block positions and connections in flowgraph change on different machines](https://www.ruby-forum.com/t/block-positions-and-connections-in-flowgraph-change-on-different-machines/260989)
**Author:** [@gsrflo](https://www.ruby-forum.com/u/gsrflo)\ **Replies:** 0\ **Last updated:** [February 17, 2021, 3:01pm UTC](https://www.ruby-forum.com/t/block-positions-and-connections-in-flowgraph-change-on-different-machines/260989 "2021-02-17T15:01:51Z")
Hi guys, how do you manage working on the same flowgraph in GRC while using different machines? While the flowgraph and each block’s position seem pretty decent on one PC, blocks aren’t aligned and connections aren’t s… --- ## [Embedded python block - infinite loop issue](https://www.ruby-forum.com/t/embedded-python-block-infinite-loop-issue/259715)
**Author:** [@Julark1](https://www.ruby-forum.com/u/Julark1)\ **Replies:** 1\ **Last updated:** [January 12, 2021, 11:34am UTC](https://www.ruby-forum.com/t/embedded-python-block-infinite-loop-issue/259715 "2021-01-12T11:34:13Z")
Hello! I’m trying to develop an embedded python block to use file as a source. The pre-existing file source block doesn’t match what I need thus I am forced to build one myself. The objective is the read a text file (a … --- ## [Calling a GRC file in another GUI](https://www.ruby-forum.com/t/calling-a-grc-file-in-another-gui/230016)
**Author:** [@jason\_sam](https://www.ruby-forum.com/u/jason_sam)\ **Replies:** 4\ **Last updated:** [December 26, 2020, 1:31pm UTC](https://www.ruby-forum.com/t/calling-a-grc-file-in-another-gui/230016 "2020-12-26T13:31:02Z")
Hi, If i make a GUI in python language and i want to call a GRC file from that GUI by pressing a button or something,then it’s possible to call a file like that?? Regards, Ali --- ## [Have the GNU Radio turorials changed recently](https://www.ruby-forum.com/t/have-the-gnu-radio-turorials-changed-recently/260548)
**Author:** [@John\_Spence](https://www.ruby-forum.com/u/John_Spence)\ **Replies:** 0\ **Last updated:** [December 2, 2020, 8:24pm UTC](https://www.ruby-forum.com/t/have-the-gnu-radio-turorials-changed-recently/260548 "2020-12-02T20:24:11Z")
About 2 weeks ago I was going through the tutorials for GNU Radio. I came back to one today and it seems to be different. I have a screenshot of what I did 2 weeks ago and a link to the page I thought it came from. You c… --- ## [Gnu radio flow graph](https://www.ruby-forum.com/t/gnu-radio-flow-graph/260467)
**Author:** [@sacinold](https://www.ruby-forum.com/u/sacinold)\ **Replies:** 0\ **Last updated:** [November 7, 2020, 1:09pm UTC](https://www.ruby-forum.com/t/gnu-radio-flow-graph/260467 "2020-11-07T13:09:46Z")
. Can someone help to check whether these transmitter and receiver sliding correlator channel sounder flow graph are rightly configured. Thanks --- ## [Schmidl and Cox method in OFDM blocks](https://www.ruby-forum.com/t/schmidl-and-cox-method-in-ofdm-blocks/246089)
**Author:** [@Rafa\_F](https://www.ruby-forum.com/u/Rafa_F)\ **Replies:** 2\ **Last updated:** [August 14, 2020, 12:37pm UTC](https://www.ruby-forum.com/t/schmidl-and-cox-method-in-ofdm-blocks/246089 "2020-08-14T12:37:07Z")
Hi, I have been trying to understand OFDM blocks, especially equalization and estimation part of the code. In the file ofdm\_chanest\_vcvc\_impl.cc, schmidl and cox method is used. I am unable to understand use of thi… --- ## [OFDM Receiver example In Gnuradio](https://www.ruby-forum.com/t/ofdm-receiver-example-in-gnuradio/260113)
**Author:** [@Mousi](https://www.ruby-forum.com/u/Mousi)\ **Replies:** 0\ **Last updated:** [August 10, 2020, 2:38pm UTC](https://www.ruby-forum.com/t/ofdm-receiver-example-in-gnuradio/260113 "2020-08-10T14:38:24Z")
Hallo, I have a question related to the ofdm receiver example in gnuradio. I put a delay block before Schmidl\_Cox synchronizer and I changed it. After 7 samples delay the system beginns to produce errors and for the de… --- ## [Detect Signal using GRC and Raspberry pi](https://www.ruby-forum.com/t/detect-signal-using-grc-and-raspberry-pi/252549)
**Author:** [@Hamza.haras](https://www.ruby-forum.com/u/Hamza.haras)\ **Replies:** 3\ **Last updated:** [July 10, 2020, 4:44pm UTC](https://www.ruby-forum.com/t/detect-signal-using-grc-and-raspberry-pi/252549 "2020-07-10T16:44:49Z")
Hi, I am trying to simply detect specific signal at specific frequency (as a start) then send signal from raspberry pi to arduino to trigger other command. From my research I found GRC as best option with hackRF one. I… --- ## [Cross correlation of complex signals in gnuradio](https://www.ruby-forum.com/t/cross-correlation-of-complex-signals-in-gnuradio/194550)
**Author:** [@john-anes](https://www.ruby-forum.com/u/john-anes)\ **Replies:** 4\ **Last updated:** [July 8, 2020, 1:59pm UTC](https://www.ruby-forum.com/t/cross-correlation-of-complex-signals-in-gnuradio/194550 "2020-07-08T13:59:08Z")
hi, I want to cross-correlate two complex signals in gnuradio. is there a block to do that? Thanks --- ## [Pass tcp/ip sockets throught gnu radio](https://www.ruby-forum.com/t/pass-tcp-ip-sockets-throught-gnu-radio/259954)
**Author:** [@dineshlama](https://www.ruby-forum.com/u/dineshlama)\ **Replies:** 0\ **Last updated:** [July 7, 2020, 2:02pm UTC](https://www.ruby-forum.com/t/pass-tcp-ip-sockets-throught-gnu-radio/259954 "2020-07-07T14:02:18Z")
Is it possible to send and receive tcp/ip data like ros topics and sockets throught software defined radio network? The SDR will be implemented for radio transceiver and i want to pass tcp/ip sockets and ros topics over … --- ## [GNURadio fails to generate flow graph](https://www.ruby-forum.com/t/gnuradio-fails-to-generate-flow-graph/259896)
**Author:** [@bob11334](https://www.ruby-forum.com/u/bob11334)\ **Replies:** 1\ **Last updated:** [June 25, 2020, 9:00pm UTC](https://www.ruby-forum.com/t/gnuradio-fails-to-generate-flow-graph/259896 "2020-06-25T21:00:13Z")
Was away from GNURadio for about a month and when I came back, none of my flow graphs built at all. Using Ubuntu 18.04 dual booted from Windows 10 with GNURadio 3.9 Attached image is the error it’s throwing Image in r… --- ## [USRP FPGA resource utilization](https://www.ruby-forum.com/t/usrp-fpga-resource-utilization/120955)
**Author:** [@C\_S\_Nagaraj](https://www.ruby-forum.com/u/C_S_Nagaraj)\ **Replies:** 4\ **Last updated:** [May 13, 2020, 6:04am UTC](https://www.ruby-forum.com/t/usrp-fpga-resource-utilization/120955 "2020-05-13T06:04:54Z")
Dear All, I’m planning to use the DBSRX with USRP board. After the frequency translation and filtering I want to process the samples further inside the FPGA, before transferring it to the host. Could you please let … --- ## [Stock Data from audio file](https://www.ruby-forum.com/t/stock-data-from-audio-file/259420)
**Author:** [@EquinoxElahin](https://www.ruby-forum.com/u/EquinoxElahin)\ **Replies:** 0\ **Last updated:** [April 30, 2020, 5:32pm UTC](https://www.ruby-forum.com/t/stock-data-from-audio-file/259420 "2020-04-30T17:32:38Z")
Hi everyone, I start GNU Companion and I m looking for stocking datas. I explain you the situation : I got an audio source and I would like to stock each values which is transmitted into a vector in order to get the max … --- ## [Transmit filtering](https://www.ruby-forum.com/t/transmit-filtering/211490)
**Author:** [@luislavena](https://www.ruby-forum.com/u/luislavena)\ **Replies:** 7\ **Last updated:** [April 24, 2020, 5:03pm UTC](https://www.ruby-forum.com/t/transmit-filtering/211490 "2020-04-24T17:03:42Z")
I’m generating two NBFM signals, offsetting them plus and minus 25 kHz with FreqXlatingFilters, and combining the output in an adder which then drives a USRP sink. It seems sensible to put a bandpass filter on the re… --- ## [Want to buy a USRP B200](https://www.ruby-forum.com/t/want-to-buy-a-usrp-b200/240719)
**Author:** [@musicdenotation](https://www.ruby-forum.com/u/musicdenotation)\ **Replies:** 1\ **Last updated:** [April 13, 2020, 7:23pm UTC](https://www.ruby-forum.com/t/want-to-buy-a-usrp-b200/240719 "2020-04-13T19:23:03Z")
I want to buy a usrp B200. is here anyone, who is interested to sell this unite? Thanks --- ## [Conversion of .dat file to a readable data using GNU octave](https://www.ruby-forum.com/t/conversion-of-dat-file-to-a-readable-data-using-gnu-octave/259208)
**Author:** [@sacinold](https://www.ruby-forum.com/u/sacinold)\ **Replies:** 0\ **Last updated:** [April 10, 2020, 12:24pm UTC](https://www.ruby-forum.com/t/conversion-of-dat-file-to-a-readable-data-using-gnu-octave/259208 "2020-04-10T12:24:04Z")
I am working on channel sounding using USRP and GNU radio platforms. I am experiencing difficulty in converting the .dat file of sink file at receiver of flow graph into readable data using GNU octave. Can somebody help … --- ## [Send own message via RF using GNU Radio](https://www.ruby-forum.com/t/send-own-message-via-rf-using-gnu-radio/253408)
**Author:** [@super](https://www.ruby-forum.com/u/super)\ **Replies:** 1\ **Last updated:** [April 5, 2020, 10:43pm UTC](https://www.ruby-forum.com/t/send-own-message-via-rf-using-gnu-radio/253408 "2020-04-05T22:43:55Z")
Hello, I’m trying to do the following setup but i don’t know how to do it and i need some guidance. I’m trying to send a message via RF with GNU Radio via a Hackrf One SDR and capture it with another Hackrf One, Betwee… [Previous page](https://www.ruby-forum.com/c/gnu-radio/15.md) [Next page](https://www.ruby-forum.com/c/gnu-radio/15.md?page=2)