Questions tagged [gnuradio]
The gnuradio tag has no usage guidance.
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0answers
134 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 ...
1
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2answers
111 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 ...
3
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1answer
178 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
91 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
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1answer
305 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
107 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
81 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://...
0
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1answer
386 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
119 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 ...
0
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1answer
304 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
184 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
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1answer
120 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
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2answers
72 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
181 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:
...
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1answer
166 views
I want to know the bandwidth of this signal; problems using “QT GUI Frequency sink” to show it
As shown in two pictures，setting a different bandwidth-value in the module, the value of the coordinate axis change accordingly. How did it happen? And I want to know if gnuradio can tell us the ...
3
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1answer
508 views
How to measure signal power in GNU Radio.(I wondered how much dBm is specific.)
I used the "QT GUI frequency sink" and "WX GUI FFT sink" to measure the signal.
But I got different value. I would like to know what dB stands for in them. Whether it is dBm or just a ratio.
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1answer
117 views
Choose the right dongle for NOAA images visualization with GnuRadio [closed]
I'm a newbie in such domain and I was reading some articles around the internet and what attracted me most is using the GnuRadio to see NOAA images using some cheap hardware.
I looked further it ...
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1answer
348 views
Why is GNU Radio dropping packets when I introduce a Frequency Xlating FIR filter?
I've got a GNU Radio flowgraph intended to take a signal from a USRP X310 at a 25MS/s sample rate and downsample it to 2.4576MS/s for demodulation as 9600 baud GMSK.
If I run the USRP straight into a ...
0
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1answer
43 views
communicate two different gnu radio files
My question is that is there any method to send data from a gnuradio file (or in the generated python code) to another one? There is a transmitter file and it transmits signals with different ...
1
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1answer
135 views
Automatic transmitter-receiver
I am studying on making automatic transmitter and receiver with usrp on gnuradio. Firstly, I should transmit any signal with center frequency 400,410,420,430 Mhz with 2 seconds waiting time for each ...
0
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1answer
282 views
GNU Radio BPSK reception from ICOM SSB audio
I have BPSK flowgraphs that work fine in simulation as well as between two USRP boards at 1200 bps and sample rate of 48000 baud. In the transmitter flowgraph, the transmitter reads HDLC bits from a ...
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1answer
519 views
How to change center frequency automatically in GRC?
I'm on reasearch using USRP and GNU radio for solar flare observation. The research is making digital radio receiver in GNU radio companion and using USRP B200. Basically the purpose of system is to ...
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1answer
863 views
How to make GRC flowgraph run and stop automatically during some period
I have beacon receiver program the flowgraph is shown here
I have to make the flowgraph run and stop automatically during a preset period, because I have to make the flowgraph only work when the ...
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0answers
109 views
Information on GSM [closed]
My team and I are using a SDR, GNU Radio, and some other hardware assembled into a custom tablet and a Python program we are writing to detect IMSI Catchers. I have some Packet Capture files with ...
13
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2answers
767 views
How do I receive ATV with GNU Radio?
How do I receive Amateur television (ATV) — e.g., NTSC in the U.S. — with GNU Radio so I can play the A/V in, e.g., the VLC video player? Are there any example GNU Radio block diagrams to accomplish ...
1
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1answer
92 views
How to explain a frequency pic at 1.5 kHz?
I have a pic in the VLF band at 1.5 kHz. What would be the origin of this peak?
The graph was obtained by running display_qt in Linux from a laptop.
4
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1answer
2k views
Signal Source Block of GNU Radio
GNU Radio has a Signal Source Block which considers a set of variables to produce an output, namely sample rate, frequency and amplitude.
In signal processing, we define a basic waveform by its ...
3
votes
0answers
513 views
OFDM spectrum, HACKRF, and GNUradio companion
I am trying to analyze the spectrum of wifi spectrum.
I getting a good OFDM spectrum with my HackRF at 2.412 GHz (from my first QTGUI Sink).
But I get nothing out of OFDM Receiver. I was wondering ...
2
votes
1answer
429 views
Gnu Radio with Funcube Dongle SDR
I am Trying to use Funcube Dongle Pro+ on Windows with Gnu radio companion with no success.
My PC is detecting The Funcube Dongle Pro+, and it works on SDR#, But It doesn't work on Gnu Radio. I have ...
4
votes
1answer
3k views
How to choose the right sampling rate and bandwidth for RTL-SDR dongle?
Receiving the frequency of 97.9 MHz
I have a Terratec SDR dongle and I am trying to capture a radio frequency. The FFT window shows the frequency range from -500 to 500 KHz. Is there a way to ...
5
votes
2answers
2k views
Decimation to listen to FM radio with gnu radio
I am trying to listen to FM station using an SDR and GNU radio. I have followed this procedure
Is there a reason that the decimation is done gradually? For example would it make a difference if I ...
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1answer
666 views
gr-osomosdr Could NOT find Boost (C++ libraries)
End goal: Play about with RTL-SDR in GNURadio Companion
While following the instructions on this page, I've run into errors concerning the Boost C++ libraries. While building the gr-osmosdr blocks to ...
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1answer
2k views
Transmit on multiple frequencies with USRP using GRC
I am using an Ettus Research B200 with GNU Radio Companion (GRC) and I would like to transmit two signals at two different frequencies simultaneously.
As a simple example, I would like to transmit a ...
1
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1answer
2k views
Decode digital signal (On-Off Keying) with SDR
I have a HackRF, and I'm trying to figure out the best way to decode an On-Off Key digital signal. I'd like to just run a script (specifying the frequency and sample rate) and have it print out the ...
2
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1answer
216 views
How link between gnuradio and baudline?
I want to create a sink block in GNU Radio which transfers the signal to baudline. My purpose is viewing SDR's received signal online. How should I program this block?
2
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1answer
1k views
SDR GnuRadio gr-dsd decode D-STAR voice
Hy i found this projekt: gr-dsd i compiled it and it seems to work so far.
My problem is i don't find any Example just a Youtube Video (www.youtube.com/watch?v=DtkiC_Li_GI) wher it is used.
Can some ...
2
votes
2answers
2k views
Can I send samples from the device made by myself to GNU radio?
I have two high-speed sampling devices that can use UDP (through 1G Ethernet) and PCIe to transmmit their samples, respectively. They are used to record signals I interested. These devices are made by ...
4
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1answer
175 views
What kind of modulation is this?
I was able to demodulate a signal I've recieved in gnuradio. Here you can see my flowgraph:
But now I would like to be able to send data as well. But how should I modulate my data? As you can see I'...
3
votes
1answer
194 views
Losing Low Frequencies in AM transmission
I've been using a USRP software-defined radio to try to send an amplitude modulated signal to a very basic receiver, basically just a piece of wire as an antenna, over a very short distance. The ...
