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0answers
86 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
67 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
152 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
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1answer
78 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
215 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
78 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
77 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
337 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
votes
1answer
102 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
246 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 ...
1
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3answers
159 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
votes
1answer
106 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
votes
2answers
67 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
155 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: ...
1
vote
1answer
136 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
votes
1answer
432 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.
1
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1answer
104 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 ...
1
vote
1answer
296 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
votes
1answer
39 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
122 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
votes
1answer
223 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 ...
1
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1answer
457 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 ...
1
vote
1answer
744 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 ...
1
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0answers
104 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 ...
11
votes
2answers
688 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
vote
1answer
90 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
471 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
406 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 ...
1
vote
1answer
596 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 ...
1
vote
1answer
1k 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
vote
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
votes
1answer
207 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
votes
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
1k 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
votes
1answer
167 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
187 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 ...