Questions tagged [gnuradio]
A widely used toolkit used to develop software-defined radios and general signal processing applications.
115
questions
-1
votes
0answers
18 views
How to automatically scan wide band signal?
As gr-scan has a long time not been developed,I don't know how to automatically scan wide band signal without this tool.
How to automatically scan wide band signal?
0
votes
1answer
31 views
Does signal frequency affect the band width of SDR hardware?
I am new to SDR,already owned USRP B210 and start to learn Gnuradio.
I have follow question:
B210 has max bind width 56Mhz.When I use max sample rate to received signal,does the signal frequency(...
0
votes
2answers
43 views
How did "rational resample" change the type of wave?
Flow graph in Gnuradio as below:
Before running this flow, I think "interpolation 1" and "decimation 1" won't change the signal.
And, I can't image how "Rational Resampler&...
0
votes
4answers
33 views
What cause `multiply` has difference result between `float` and `complex` signal?
Construct 2 similar flow graph in Gnuradio,just different with data type.
complex type data has a correct result.But ...
1
vote
2answers
26 views
What's the `Minimum signal duration` and `Minimum detectable signal duraion` of Ettus B210?
When read keysight 9913A manual,
Minimum signal duration with 100% probability of intercept (POI) at
full amplitude accuracy 12 µs Minimum detectable signal 22 ns
What's the ...
3
votes
1answer
26 views
How to change the display order of qt gui sink in gnuradio?
I create simple flow graph in gnuradio as below:
The expected output order is:
1.qt gui sink
2.frequency sink
3.time sink
But time sink appear first,then gui sink:
How to change the display order ...
3
votes
2answers
76 views
Why does a sine wave show two peaks in the frequency domain on GNUradio?
I constructed the flow graph in GNUradio 3.7 as below:
I know a sine wave has only one frequency, so what causes the frequency sink to show two peaks?
4
votes
1answer
42 views
Gnuradio bandwidth of sink cause signal frequency changed?
System is debian 10 with gnuradio 3.7.
untitled.grc create simple flow graph as below:
The only difference between 2 flows is bandwidth of gui sink,cause 2 ...
-3
votes
1answer
133 views
How can I jam cell phone communications with gnu radio and hackrf? [closed]
I need to make this project, plase help me with some ideas
0
votes
2answers
87 views
human voice / music radio signal without RF moduation
This question is about digital voice modes that are used with AM / SSB / FM radios. Dstar , FreeDV , etc.
assumptions:
pulse width modulation amplifiers can take a digital signal as input.
a software ...
0
votes
1answer
41 views
GNU Radio transmission for a set amount of time
I am trying to transmit a signal in gnu radio and after a set amount of time have the transmission cut off. For simple example, I have a sine wave that I want to transmit for 30 seconds then after ...
2
votes
1answer
71 views
Why does QPSK signal in GNU Radio shift away from my center frequency at higher frequencies?
I am transmitting a QPSK signal via GRC and when I look at it on the spectrum analyzer, the signal is shifted away from my center frequency. This shift increases the higher the center frequency (i.e. ...
0
votes
0answers
128 views
Writing "Wav" file in GNU Radio 3.9.0
I need to burn an audio file received from a computer sound card. But in the new version of the gnu radio, I found that the "Wav File Sink" and "Wav File Source" blocks were gone. ...
2
votes
1answer
314 views
Implementing a BPSK and 4-FSK transmitters in GnuRadio (GRC) with USRP?
Currently trying to transmit a BPSK and a 4-FSK(MFSK) signal via GRC using USRP, I have two attempts at it but don't seem to be going anywhere. Still fairly new to GRC. For the BPSK, how will this ...
2
votes
0answers
90 views
Installing GNU radio on android
I want to install this miracle program on my smartphone in order to get more mobility.
I found such a solution exists:
https://github.com/bastibl/gnuradio-android
However, I could not do everything as ...
0
votes
0answers
88 views
gnu-radio on Ubuntu 20.04 and AIS processing seems impossible
I have searched, installed, and tried every package there is to get AIS processing using the gnu-radio companion to no avail.
I tried installing gnu-radio both with conda and apt on Ubuntu 20.04. The ...
2
votes
1answer
71 views
Transmit filter for Amplitude-shift keying
I want to transmit an ASK signal with GNU Radio and HackRF, the parameters are:
Frequency: 27.12 MHz (ISM)
Sample rate: 2MSPS
Symbol rate: 2000 bps
Samples per symbol: 1000
The flowgraph currently ...
1
vote
0answers
196 views
GNU Radio FM Receiver does not work on Ubuntu 20.04 nor on Windows 10
GNU Radio v3.8 with Qt-GUI on Ubuntu 20.04
Before starting on something new I always test my setup with this GNURadio hello world flow graph which I know for sure, that it used to work.
The other day, ...
0
votes
0answers
36 views
Ofdm carrier allocator block in gnu radio
I have some very basic question of the ofdm carrier allocation in gnu radio that am not understanding.please help me to understand. I want to pass a LTE based ofdm modulated signal simply like the ...
2
votes
1answer
237 views
Heterodyning complex values in gnuradio
I have been working at educating myself on how SDR and GNU Radio works.
In order to demonstrate heterodyning, I set up a flow-graph consisting of 2 signal generators, a Multiply block, and QT GUI ...
1
vote
0answers
94 views
Capture Uplink GSM packets using 820T2 and SDR
I am an extreme beginner with SDR. I am trying to use the 820T2 & SDR device to capture uplink gsm packets sent by my phone to the nearest Base Station. I have an Rx Monitor App installed on my ...
2
votes
1answer
98 views
Output power from the TX/RX port of the USRP N210 decreases as the frequency increases
I am trying to build an FMCW radar using a USRP N210 with a CBX40 daughterboard. I generate a sweep from 1.5GHz to 5GHz. According to their respective datasheets, the daughterboard and the USRP should ...
0
votes
1answer
97 views
Upconvert Signal with USRP N210 in GNU Radio Companion
I'm using a USRP N210 with this GRC diagram where I'm trying to upconvert a 1kHz sinewave.
I tried just upconverting the signal from the signal source to 2.5GHz. However, I keep getting the output ...
0
votes
1answer
228 views
FMCW radar with USRP and GNU Radio Companion
I am new at gnuradio companion and USRP and I am a little bit confused with UHD:USRP Sink block. I am trying to build an FMCW radar in USRP N210 with CBX40 daughterboard. I want to generate a sweep ...
1
vote
0answers
32 views
how to set the CFO standard deviation in CFO models
I need some help with a simple thing. I am trying to simulate carrier frequency offset model for Bluetooth Low Energy standard in GNURadio (I am bit new to this). For this purpose, there is a CFO ...
1
vote
0answers
124 views
Frequency synchronization in GNU Radio for OFDM 16-QAM x 6
I am transmitting a 16khz data signal using OFDM 16-QAM x 6 carriers and the library amodem using a HackRF. However, I am having issues receiving this signal as the frequency the HackRF transmits on ...
0
votes
1answer
360 views
Implementing FM receiver using GNU Radio C++ API
This is my first ever experience with GNU Radio. I am trying to implement a simple FM receiver shown below with its C++ API.
I seem to have pedantically deconstructed this receiver into its smallest ...
3
votes
1answer
275 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
369 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
260 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
135 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
132 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
488 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
153 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
100 views
0
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1answer
548 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
146 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
125 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
550 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
122 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
votes
0answers
82 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
62 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
79 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
61 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
214 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
80 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
2answers
3k 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
53 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
277 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
189 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 ...