Questions tagged [gnuradio]
A widely used toolkit used to develop software-defined radios and general signal processing applications.
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GNU Radio USRP B210 overflow when writing to fast SSD disk [closed]
I'm experiencing same issue described in that GitHub topic:
https://github.com/EttusResearch/uhd/issues/58
Here is my PC specs:
Win 10
AMD Ryzen 5 3600 6 Cores@4150MHz
16GB Ram@3600Mhz
ADATA SX8200PRO ...
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4
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0
answers
30
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GNU Radio and OsmoSDR AGC for Hack RF
I am trying to construct an automatic gain controller for my HackRF when in receive mode. I am using the gr-osmosdr block in GNU Radio to interface with the HackRF. I am then running my received I and ...
1
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1
answer
209
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How to use GNU Radio to demonstrate FM demodulation without baseband signals
Using GNU Radio, I'm currently trying to create a flow graph containing a simple demonstration of how FM modulation and demodulation works. Since the target audience is not accustomed with complex ...
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1
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185
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Unstable frequency generator using gnuradio 3.10
I run gnuradio on Windows 11 using anaconda install. It uses hackrf without portapack. I am using a signal amp from an F16 fighter jet. It requires 10 dBm input and runs on 24 V 2 A. Picture here
It ...
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208
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How to trigger transmission using GNU Radio companion on a X310 USRP?
I am trying to transmit an RF signal that is created via GNU Radio Companion (GRC) on an X310 USRP, but I only want the signal to be present on the output when an external trigger is high.
There is a ...
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votes
2
answers
896
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using 3.10 gnuradio and hackrf to make a signal generator
I have had a gnu radio program using 3.7 and it worked with hackrf. Now 3.10 offers soapy interface and osmosdr. I don't know how to interface either one with hackrf.
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1
answer
241
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hackrf and gnuradio 3.7 making a signal generator
I am trying to make a signal generator utilizing gnuradio and hackrf osmocom but it doesnt want to execute
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1
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1
answer
65
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How to set the time sink to roll mode like oscilloscope?
How to set the time sink to roll mode like oscilloscope? The signal rolls in from the right side of the oscilloscope screen and rolls out from the left side so that we can see the complete picture of ...
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0
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0
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79
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How to understand the time in Gnuradio?
I have the following questions:
I have set the initial phase of the signal source to 0, But I can barely capture the waveform with an initial phase of 0 even if I stop the time sink ASAP. why?
After ...
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60
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Why does a peak remain at -10db gain and disappear at -50db gain?
I have a Pluto and an RTL-SDR both connected to a computer. On Matlab, I run such a script:
...
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1
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2
answers
62
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Phase detection accuracy with USRP N210 and CBX-40
I have designed a simple TX/RX system in GRC with a single USRP N210 and CBX-40.
I am transmitting sinusoidal signals at various frequencies within the 2-6GHz range and detecting the amplitude and ...
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2
votes
2
answers
400
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How to avoid overflow in embedded python block in GNURadio?
I am currently working on project which utilizes RTL-SDR for capturing packets. I want to capture packets incoming on two different channels. I created the following RF path and it works just fine in ...
- 133
1
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1
answer
181
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Transmitting high-speed PWM over RF
First, let me apologize in advance if this isn't the correct exchange to post this question on.
I have a 50 MHz PWM signal (it's actually a 50 MHz 50% DC clock with a 1PPS clock embedded with PWM) ...
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0
votes
1
answer
138
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Descrambling/dewhitening in GNURadio
I am currently working on project which utilizes RTL-SDR for capturing packets. I know that those packets are whitened with x^9 + x^5 + 1 polynomial. No matter what I do the descrambling each time ...
- 133
2
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0
answers
106
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DVB-T gnuradio loopback
I have recently had access to two SDRs a hackrf and a Plutosdr through my university.I am now trying to experiment and learn more about wireless communications and how to implement some examples on an ...
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2
answers
218
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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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1
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147
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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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0
votes
1
answer
274
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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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1
answer
505
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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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-3
votes
1
answer
151
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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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0
votes
1
answer
63
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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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votes
2
answers
39
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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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-1
votes
1
answer
210
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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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0
votes
1
answer
66
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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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0
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0
answers
345
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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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2
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0
answers
614
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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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2
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0
answers
152
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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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1
answer
67
views
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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1
vote
1
answer
1k
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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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0
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610
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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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1
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1
answer
673
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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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2
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487
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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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6
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0
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2k
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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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2
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3
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150
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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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1
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354
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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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1
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0
answers
802
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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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0
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587
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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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0
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1
answer
72
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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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0
votes
2
answers
314
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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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0
votes
4
answers
240
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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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1
vote
2
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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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3
votes
1
answer
781
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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
549
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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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4
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1
answer
356
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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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1
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484
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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
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141
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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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0
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1
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525
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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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2
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1
answer
153
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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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0
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1
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908
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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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1
answer
2k
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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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