Questions tagged [gnuradio]
A widely used toolkit used to develop software-defined radios and general signal processing applications.
75
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Silly doubt on Radio: A quest to find a radio station or online radio [on hold]
I'm new here on this stackexchange so maybe this question will be offtopic.
So I'm not searching a particular Radio Station. But, I'm searching a radio station with some "particularities". A all ...
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1answer
31 views
GNU radio companion raw captured data file split
My file is a simple raw data 32 bit floats sampled at 384 kHz. No metadata or anything alike. The file is some 10+ GB. I am looking for a method of isolating a certain group of signals from it into a ...
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1answer
44 views
Gnuradio AM broadcast receiver distorted audio
I have been trying to build a gnuradio AM broadcast receiver, but without success. I have tried a lot of combinations, but all of them produce a very distorted audio. I have an NBFM receiver using the ...
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37 views
Text transfer From/To SDR
I bought a hackrf one and I don't think it works.
Before I return it can someone show me a grc flowchart on how to send text or a text file from a hackrf to a rtlsdr?
I have been told you can do it. ...
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3answers
81 views
What is the typical latency of a SDR setup running on a desktop computer?
It's well-known that the signal processing of an SDR adds a significantly amount of latency, the SDR software on the computer adds more latency due to data buffering, FFT, decoding, demolutaion, audio ...
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1answer
90 views
Center-frequency parameter for gnuradio noise generator flowgraph
Can I add a center-frequency parameter for my noise generator flowgraph, is there a different noise source that has this parameter other than the generic noise source block?
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37 views
Gnuradio loopback flowgraph is not working
I found the below uhd_two_tone_loopback example (which is one of the gnuradio provided examples) and I am trying to run it, it runs but I can't receive signal.
EDIT:
I mean when I run the program I ...
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1answer
55 views
Controlling the number of samples
In the below simple qpsk_tx_uhd flowgraph I am trying to create a slider to control the number of samples but got a bit confused with which parameter I should be ...
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0answers
38 views
Error in an attempt to simulate SDR frontend hardware in GRC
I was reading these lecture slides: https://web.mit.edu/6.02/www/f2006/handouts/Lec9.pdf
and I tried to implement some of the schematics shown there in GNU Radio.
On page 3 the author describes how ...
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0answers
29 views
uhd_packet_rx do not work
I was trying to set up packet communication using examples in gr-digital/examples/uhd_packet_tx and rx. uhd_packet_tx is doing fine, but on receiver side(uhd_packet_rx) is freeze when i check up the ...
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66 views
I/Q demodulation of DSBSC-AM signals
I was looking at some Stereo FM demodulators on the Internet, and I can't understand
the use of the complex to real block for demodulation of the L-R signal (DSBSC-AM)
which can be seen in different ...
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31 views
What the difference preamble and access code?
gnuradio packetize using access code for start sync packet, but another example attach the preamblee, so what the differences preamble and access code ?
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1answer
252 views
GNU Radio does not run flow graph
I am sorry but yet again a question about GNU Radio. (I just started following some tutorials a couple of months ago and am learning about it. I am unfortunately not that proficient in it yet, but I ...
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42 views
A gnuradio program that can output some arbitrary waveform read from a file containing I/Q values
I am trying to figure out how to create a gnuradio program that can output some arbitrary waveform read from a file containing I/Q values.
I would highly appreciate any guidance in this topic. Simple ...
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2answers
85 views
How to output a CW tone or a Broadband Noise in GnuRadio?
Kindly, can anyone show me how to output CW tone or a Broadband Noise in GnuRadio in a sort of simple flowgraph if possible?
Update:
So, what I did is I tried not to overthink the whole issue here ...
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0answers
41 views
How FEC works on GNU Radio
I am new to GNU Radio.
I need some reference to how to use FEC block in GNURadio.
When I try to make encoder and decoder without modulation, its work as well, but when I using modulation and add ...
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2answers
97 views
How much power does an RTL-SDR draw?
Background:
Last night (and the night before) I was playing with my RTL-SDR and GNU-Radio again. Working with my FM Receiver, (which was working previously by the way), I detected that last night I ...
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0answers
59 views
Trouble with osmocom source
I'm having trouble running a simple flowgraph with an osmocom source and a qt gui sink. If I run the file with a waveform generator instead of the osmocom source, all is well, the plots appear as they ...
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70 views
No module named 'analog_swig' [duplicate]
I know guys you gonna tell me tat there is something wrong about GnuRadio or Pybombs installation. Well, this is my third time during the past 48 hours I reformat the OS of my mini pc fitlet2 mint ...
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44 views
No module named _osmosdr_swig [duplicate]
I am trying to run GnuRadio python code in my python web server and got the "No module named _osmosdr_swig" error. Please, what is the cause for this error?
I know it sounds like so obvious that I ...
2
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2answers
364 views
No module named 'gnuradio'
I encountered with the "No module named 'gnuradio'" error while I was trying to run GnuRadio python code in my python web server.
And this is my gnuRadio generated code:
...
2
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1answer
131 views
Merging gnuradio generated python code into the Python web server
I am trying to figure out how I control a Software Defined Radio over a network, and stream the received baseband samples from my remote hardware back to the gnuradio.
What I'm trying to do here is, ...
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0answers
84 views
Simple Gnuradio TX/RX loopback example/tutorial
I'm looking for some sort of simple and a beginner level instructions on how to build TX/RX loopback flowgraph using GnuRadio software and B200 USRP with an attenuator FW -10 + 10dB.
Kindly, help me ...
3
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0answers
92 views
GnuRadio RF transmission, legal and safety issues
I'm trying to run some transmit/receive RF examples that I found online using GNU Radio with USRP B200. I read and heard about some cautions in terms of transmitted frequencies here in the USA which ...
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57 views
HackRF One and IoT overloaded?
I'm transmitting Z-Wave frames using HackRF One in loop, one frame every second. Has anyone clue why are some frames not transmitted? You can see several too long gaps between frames on Waterfall (...
3
votes
1answer
75 views
Why is GNU Radio “stuttering” with this flow graph?
I have a GNU Radio Companion flow graph, where I have the following connections:
440Hz cosine wave
throttle block
audio sink
All of the above blocks use the same sample rate (48KHz).
When I ...
2
votes
1answer
47 views
How to record fixed number of samples in gnuradio
Is it possible to set a gnuradio flowgraph to record with a File Sink a fixed number of samples? I would like to use this wave as a reference.
Thank you!
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0answers
49 views
Qt application freezes after a fixed time period
I have an Ettus E310 from which I send some data via ZMQ to a computer.
On the remote computer I am running a Qt GUI in which I am displaying a FFT and a variable.
After about an hour, the GUI needs a ...
2
votes
1answer
285 views
GnuRadio alternative for Selector Block
Hi I want to switch between tx and rx in a flow graph with my HackRF.
I found this video that shows how it could be done.
The key component is the Selector block which is now deprecated.
Is there a ...
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1answer
71 views
Using Satnogs' *.ogg files in GnuRadio flowgraphs
I want to use the *.ogg files available in Satnogs' database to test demodulation software for several satellites (using gnuradio).
Can i use the ogg file source (available in gr-satnogs module) and ...
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0answers
54 views
How to limit frame transfer in Gnu Radio Companion?
I have as source a bit frame, then I modulate it, to finally transmit it with my HackRF. I can receive and decode it normally with another HackRF.
However I would like to limit to a number of frame ...
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1answer
221 views
How I can build dvb-t/dvb-t 2 transceiver?
I need dvbt2 transreceiver.
I tried gnuradio with https://github.com/BogdanDIA/gr-dvbt.
The "apps/dvbt_tx.grc" is working.
But, video cannot transfer flexibly.
On gnuradio flow, I adjust multiple ...
3
votes
1answer
245 views
FM Receiver on GNU Radio with RTL-SDR fails to produce any output sound
Here is how the FM Receiver I made using the GNU Radio Companion.
(Basically, I was following this tutorial by VYE6Y on youtube.)
FM Receiver
Problem: Unfortunately for me, the GNU Radio gives no ...
2
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0answers
208 views
How to decode 2FSK signal with SDR?
I'm new to radio and SDR but, as a hobby project, I'm trying to decode a 2FSK radio signal received by an RTL-SDR that I sent using an SI4463 transmitter.
The record file contains 3 packets, but I'm ...
5
votes
1answer
211 views
FFT showing 2 signals - GNU Radio
I receive OOK signals from a remote control in 433MHz. I'm using a dongle RTL-SDR on GNU Radio.
The FFT output signal from the RTL-SDR Source block is represented on the picture:
My question is, ...
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2answers
124 views
Reset the sps on symbol sync block GNU Radio
I'm using symbol sync block (symbol_sync_ff) on my project and i use many different sps values that i need reset on runtime.
I'm trying to reset sending clock_est tag. Is this the right way to reset ...
2
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0answers
429 views
LimeSDR Mini + Raspberry Pi 3 B+ Transmission problem
I am new at this. I would like to transmit an audio signal cleanly using WBFM but I see two signal peaks occur around my fundamental frequency when I start transmitting.
In this case I am using a ...
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2answers
741 views
USRP Safe Gain Values
I am working with USRP N210 and USRP B200 radios with GNURadio. I have connected the TX/RX port of one radio to the RX2 port of the other with an RF cable as a simulated radio link. In GNURadio, I ...
5
votes
1answer
451 views
GNU Radio sinusoid multiplication does not produce perfect results
I created a simple sketch in GNU Radio that multiples two signals. One is a sine and the other is cosine. I paste a screenshot of it and its results below.
I have heard that in DSP, we can do almost ...
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1answer
173 views
AX25 + Reed Solomon : Bit stuffing errors
I'm currently working with a satellite that has AX.25 + Reed Solomon code (truncated RS(255,223)) in GNU Radio. Since there is no frame synchronization pattern, the 0x7e flags are used for frame ...
2
votes
1answer
732 views
How can I make WBFM receiver without using WBFM Receive block?
I'm trying to make a WBFM receiver without using WBFM Receive block. So I've tried this way
But it won't work. The problem is
RuntimeError: flow graph has loops!
and I need to use loop feedback ...
2
votes
1answer
534 views
How to trim out background noise GRC
I am creating a radio receiver to pick up "walkie talkie" chatter.
success it works fine! I can hear people when they speak on the radio, the only problem i am having is that when no one is speaking ...
0
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1answer
96 views
Tx-Rx synchronisation to frequency changes
So I am part of an SDR project using GNU Radio and USRPs, where we are trying to set up a link between USRPs.
The ideal is similar to the DARPA spectrum challenge (https://...
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1answer
862 views
Ettus B210 USRP Is it possible to transmit on both Tx Ports either with same or different application?
Just getting up to speed on the ettus B210 - basically the same as the B200 but with two Rf boards.
I am testing using gnuradio-companion. I have setup a very simple transmitter consisting of:
...
2
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1answer
239 views
I want to know how QT GUI Entry is implemented in gnuradio. I am puzzled how the code is like?
I find it on the website. Only the following passage:
QTGUI Widgets
The QTGUI component also includes a number of widgets that can be used to perform live updates of variables through standard ...
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1answer
657 views
GNU Radio “WX GUI Waterfall Sink” Freezes as Timescale is Reduced
I am trying to capture a 868MHz transmission using an USRPN210 and a RF900 Daughterboard. My GNU Radio flowgraph with all settings is stated below.
[
The problem is, when I try to reduce the time ...
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3answers
281 views
Viewing the broadcast FM spectrum using a USRP N210
My issue is regards to viewing the FM spectrum using USRP N210 & GNU Radio. I did try to use several blocks of GNU Radio to view an FFT plot of the FM band using the USRP N210 device. My blocks ...
5
votes
1answer
195 views
Sine signal distorted in GNU Radio
I am starting off with the Ettus Research lab-1 - lab-5 tutorial to learn GNU Radio. I have set up the following super simple flow graph. I am using WX GUI as it is what used in the tutorial.
This ...
3
votes
2answers
94 views
GNU Radio - Signal Keeps Getting Smaller?
Really bizarre issue here. Here is an image of a signal taken from SDR Sharp:
Freq: 926.365M
Bandwidth: 30k
Now, using the above measurements, here is this same signal observed in GNU Radio with ...
1
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1answer
298 views
GNU Radio code and data type conversion
I am a GNU Radio beginner, and I use the following code to make the block's output-port output a pmt data:
...
