Questions tagged [gnuradio]

A widely used toolkit used to develop software-defined radios and general signal processing applications.

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Does the specific frequency of a CW tone make a difference to output from a practical SDR?

I'm using a Nuand BladeRF 2.0 micro, which is based on the AD9361. I'm just trying to get a handle for how it behaves at the moment, so I was testing generation of some CW tones using GNU Radio and ...
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How to use SDR equipment and Gnuraio record `time domain` data?

From answer, A comment has pointed out that one could think of the saved data as in the time domain under some circumstances because it is literally series of 32-bit values written as fast as ...
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How to use RF Input B ports in GNU radio?

I have an Ettus B210, which has 4 ports: RF Input A: RX/TX and RX2, and RF Input B: RX2 and RX/TX. In GNU Radio using the USRP block I can use both ports of RF Input A. But I don't succeed to use the ...
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Real time half duplex with two hackrf one on gnuradio

I would like to know the possibilities to make a clear real time half duplex communication between two hackrf one, being both running on gnuradio. I would like to use on both ways: By a sync call on ...
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Is Gnuradio `file sink` data time domain data or frequency domain data?

When I enable file sink,I could save and read data of Gnuradio as below: Questions as below: 1.Is the file sink data time ...
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GNU Radio does not work expectedly when the frequency is 2x the sample rate

Simple flow in GNU Radio 3.8.2.0 (Python 3.9.2). If samp rate is 32k, when Frequency moves to 64k the recovered ...
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Help synchronize on unknown frequency sequence

I am having trouble to synchronize on a frequency hopping pattern between an emitter Tx and a receiver Rx. More precisely, the ...
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Is number of items in`file sink` integer multiple of `sample rate`?

I use flow graph for file sink as below: When I stop running this flow graph, there are 110000 float numbers in file ...
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What's the usage of `Multiply Const 1` and `Multiply Const 0`?

Based on Gnuradio, Multiplies the input stream by a scalar or vector constant (element-wise if vector). output = input * constant In above web page, I found ...
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what's the usage and benefit of segments in Gnuraio `file meta sink`?

In Gnuradio website, Max Seg. size is Length of a single segment before the header is repeated (in items) At first,I think ...
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Help implementing a custom signal source in GNU Radio

I am trying to implement a custom signal source in GNU Radio, but I am stuck. The idea is to generate a delayed windowed sinc() function, i.e. a function having its ...
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Problem to realise a frequency band sweeper with GNU Radio

I am very new to GNU Radio, and I am stumbling to realise a periodic frequency band sweeper. The idea is as follow: given a sampling rate samp_rate, a start ...
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Why the Receiver Sensitivity theoretical value doesn't match its experimental value when using USRP B200mini in GNU Radio?

I'm using a USRP B200mini SDR card for my GNU Radio energy detector project. I wanted to measure its Receiver Sensitivity ($RS$) experimentally and compare the experimental value to the theoretical ...
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What's the negative float of rtl_power output means?

I got below float numbers after soapy_power -f 80M:100M -B 1000 --output a --format rtl_power: ...
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the transmission and reception block for the hackRF does not work Windows 11

Previously, I used the "Osmocom sink" and "Osmocom Source" blocks, but after updating the GNU radio to version 3.9.4, these blocks were gone. As far as I understand, now it has ...
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Parameters for gnuradio block "PDU Filter"

I'm using Gnu Radio Companion 3.8.4 to create a flow graph. The graph shall decode the signal from an 2.4 GHz RC car transmitter. I started with the following graph: ...
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How to shift frequency with sine signal?

cosine signal can make square signal shift frequency. If I have only sine signal source,how ...
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ASK? PWM? decoder for gnuradio companion?

EDIT: Based on a comment below, this might actually be a two-level PWM, rather than simply ASK. Frankly, I don't really know, but any decoder blocks that folks are aware of for any of these basic ...
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What cause the spectrum peak of `center frequency`?

I use gnuradio and fosphor to view the spectrum from USRP B210, default gain set to 34, output looks like concave as below: ...
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Simple AM receiver with gnuradio / RTL-SDR

EDIT: I have succeeded in getting the AM receiver to work, by replacing the AM Demod block with a Complex To Mag, and a Band Pass filter (this is noted as an alternative in the AM Demod docs). ...
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3 answers
122 views

What cause the shape of frequency spectrum convex or concave?

I use gnuradio and fosphor to view the spectrum from USRP B210, default gain set to 34, output looks like concave as below: ...
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How to record and replay the `center frequency` when `file_sink`?

Workflow as below: When file_source after file_sink,center frequency is not recorded and ...
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GNURadio Guided Tutorial PSK Demodulation Example

I have been reading and doing the steps on this webpage of GNURadio : https://wiki.gnuradio.org/index.php/Guided_Tutorial_PSK_Demodulation In the middle of the page, there is a section: "Using ...
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Clock Recovery for 4FSK Modulation in GNU Radio

I have made a loopback flowgraph in GNU Radio companion to implement a 4FSK modulation. For the modulation section, I have simply adjusted the "chunks to symbol" block to map each 2 incoming ...
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1 answer
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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(...
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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&...
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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 ...
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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 ...
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1 answer
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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 ...
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4 votes
2 answers
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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?
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1 answer
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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 ...
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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
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2 answers
109 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 ...
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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 ...
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1 answer
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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. ...
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1 answer
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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. ...
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2 votes
1 answer
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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 ...
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3 votes
1 answer
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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 ...
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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 ...
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2 votes
1 answer
99 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 ...
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1 vote
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311 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, ...
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2 votes
1 answer
303 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 ...
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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 ...
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2 votes
2 answers
169 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 ...
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1 answer
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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 ...
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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 ...
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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 ...
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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 ...
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549 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 ...
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3 votes
1 answer
408 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 ...
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