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Questions tagged [gnuradio-companion]

GNU Radio Companion (often abbreviated as GRC) is a graphical toolkit to design GNU Radio flowgraphs and whole signal processing algorithms.

GNU Radio Companion (often abbreviated as GRC) is a graphical toolkit to design GNU Radio flowgraphs and whole signal processing algorithms.

It's not an independent project, but is included in GNU Radio. The graphically defined flow graphs get translated into Python source code that instructs GNU Radio to logically connect the blocks used.

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How to save Gnuradio Waterfall Plot?

I want to measure spectrum Occupancy of any one of the GSM band using Gnuradio and a USRP for 24 hours. Is there any way to save the waterfall plot of gnuradio in image file or any other format? If not is there any other way to show the spectrum…
John_R
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Demodulating GFSK

I'm trying to demodulate a GFSK signal coming from an nRF24L01+ transceiver chip (hooked up to my Arduino). I've followed this guide so far: https://www.bitcraze.io/2015/06/sniffing-crazyflies-radio-with-hackrf-blue/#comment-38046 ..and managed to…
Cake
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Gnuradio streaming between two computers?

Is there a simple way to implement communication between two computers running GNUradio using the standard blocks set? What I am have now is this: On a Linux computer, GNUradio is running and receiving input from a Radio peripheral. On that computer…
Zephyr
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gr-osmosdr: crashed while loading 'osmosdr_sink' 'osmosdr_source' 'rtlsdr_source'

I installed the gnuradio(3.7.9.2) from source, that is OK, and installed the rtl-sdr and gr-osmosdr from source. The rtl-sdr is OK. When I run the cmake ../ for gr-osmosdr, it outputs like this: --…
dudengke
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Receiving data using aux cable on GNU RADIO

I am transmitting and receiving data using aux cable and GNU RADIO between two laptops. I have implemented DQPSK using PSK mod block. The problem is that while receiving I have to provide a delay, some integer value e.g 0,1,2 etc. It is different…
anti mage
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How to slow down a file source in GNU Radio?

I'm attempting to unpack bytes from an input file in GNU Radio Companion into a binary bitstream. My problem is that the Unpack K Bits block works at the same sample rate as the file source. So by the time the first bit of byte 1 is clocked out,…
watkipet
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Find unknown frequency with hopping

I'm wondering about a method to find an unknown frequency. I want to intercept the data from my hydro meter, but I don't know the exact frequency. I'm pretty sure it's in the range 902-928 MHz, but my rtlsdr only has a bandwidth of about 2 or 3…
Nick Lang
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update a variable in GNU Radio over the network

I am using GNU Radio to stream RF data out using a UDP sink. The data is streamed to a controlling program. As part of this process I am frequency shifting (with a multiply block), filtering and down sampling. I would like to change the values of…
benathon
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GNU Radio - osmocom_fft issue with SDR

After recompiling twice, tried pybomb and install from repo I can't get my SDR working using hackrf. After experiencing some -5 and -1000 errors with the hackrf_info command, I can start grc without errors but it doesn't plot the spectrum. By…
bomba
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Error in developing square_ff block on grc

I am trying to develop square_ff OOT module example. I followed every step, but it will give an error on grc when try to drag on the screen. Traceback (most recent call last): File…
Sayali Karande
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Last packet lost gnuradio

Here is my flow graph: File source > Throttle > Packet encoder > Packed to unpacked > Packet decoder > File sink. No matter what i do, the final 1 or 2 packets (depending upon the number of bytes from file source) don't get written to file sink. The…
Ali Iqbal
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xml - Reading a config file multiple times (for GNU Radio)

I am currently working on a GNU Radio project and I have an issue on the xml part. I need to open a config file and read it to get my variable for GNU Radio. Now, I just have the build-in files which allow to read the config file, but just once, at…
user
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GNU Radio Companion FFT Window

I have a data file that I am trying to run through the GNU Radio Companion FFT Sink. I have my flow graph set up, no problem there. However, the FFT plot is mostly negative, and the window starts out set to 0->100. I can hit "Autoscale", but my data…
pbhuter
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Error message appear after running a GRC file

can anyone explain the error listed below and how do I go about rectifying it? [FATAL] [UHDSoapyDevice] USB transfer stalled libusb: warning [libusb_exit] application left some devices open
Jason Yeo
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Sending and receiving messages via AX.25 and GNURADIO

I have two USRP B200 connected to two Raspberry Pi's that I want to communicate via AX.25. Here are the flowgraphs: TX: RX: They work well and are able to communicate. However, if I change the samp_rate to 200k on both the TX and RX, the RX is not…
overmind
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