Questions tagged [gnuradio]
A widely used toolkit used to develop software-defined radios and general signal processing applications.
88
questions
3
votes
1answer
26 views
GNU Radio - Frequency parameter of Signal Source Block
I designed an analog FM transmitter with GNU Radio Companion in order to understand the tool better. The hardware I use is an USRP B200. The carrier was built with a Signal Source block and the ...
2
votes
0answers
42 views
Receiving and decoding RDS in GnuRadio
I'm new in radio, so I started with seemingly easy task - receive and decode RDS data. I use GnuRadio to understand the concept of working with RF signals. So according to standard RDS receiver looks ...
0
votes
1answer
78 views
GNURADIO: What does the complex output of an osmosdr source translate to?
Warning: Noob question.
I'm new to Software Defined Radio.
My aim is to write a program that tells me the signal strength of a radio emitting source (I'll use three such sources and then try to ...
1
vote
1answer
71 views
Can I get non demodulate IQ signals from WebSDR
I want to take a non demodulate audio signal from webSDR portals (http://www.websdr.org/). In order to try to feed these in DREAM DRM Radio software or GNURADIO.
Could be cool almost try it for ...
0
votes
1answer
61 views
How to identify type of modulation from recording done by gqrx or gnu radio?
Is there a tool or some other way that would allow me to find out the type of modulation of a specific signal?
What I specifically try to do is to decode signal from this remote control: http://www....
0
votes
1answer
148 views
Frequency modulation with gnuradio
I'm trying to understand way which Frequency Mod block works in gnuradio. According to my intuition there should be at least two inputs:
signal to encode
base frequency / carrier signal
Instead ...
0
votes
1answer
36 views
Find blocks function on Gnuradio does not work
I am trying to use Gnuradio to build QPSK transmission with satellites simulation for educational purposes.
Unfortunately, I am unable to add new blocks after "find blocks" (blue magnifier icon) ...
0
votes
1answer
75 views
0
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1answer
77 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 ...
1
vote
1answer
76 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 ...
0
votes
0answers
53 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. ...
3
votes
3answers
196 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 ...
0
votes
1answer
99 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?
0
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0answers
41 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 ...
1
vote
1answer
60 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 ...
1
vote
1answer
68 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 ...
1
vote
0answers
45 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 ...
3
votes
1answer
152 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 ...
0
votes
0answers
43 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 ?
1
vote
1answer
1k 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 ...
0
votes
0answers
45 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 ...
0
votes
2answers
149 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 ...
2
votes
0answers
102 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 ...
0
votes
2answers
196 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 ...
1
vote
0answers
79 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 ...
0
votes
0answers
156 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 ...
0
votes
0answers
113 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
votes
2answers
2k 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
votes
1answer
170 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, ...
1
vote
0answers
138 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
votes
0answers
100 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 ...
2
votes
0answers
82 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
102 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
71 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!
2
votes
1answer
636 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 ...
1
vote
2answers
164 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 ...
1
vote
0answers
59 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 ...
2
votes
1answer
503 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 ...
4
votes
1answer
527 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
votes
0answers
296 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
282 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, ...
1
vote
2answers
148 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
votes
0answers
462 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 ...
6
votes
1answer
187 views
SNR measurement for a BPSK/QPSK signal
I have created a software (gnuradio) that performs modulation/demodulation and supports a number of modulation schemes and error correcting codes. I'm in the process of evaluating the BER vs SNR for ...
1
vote
2answers
1k 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 ...
6
votes
1answer
630 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 ...
1
vote
1answer
215 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
904 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
840 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
votes
1answer
107 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://...
