59 questions
0
votes
0
answers
29
views
there is no audio using pyrtlsdr but there is audio with rtl_fm
using the command line below I can hear messages from my motorola t80 using channel 7 (446.08125M), sub-code 120
rtl_fm -f 446.08125M -M fm -s 12k -g 19.2 -l 50 | play -r 12k -t raw -e s -b 16 -c 1 -...
- 1
1
vote
2
answers
132
views
How to generate gnuradio signal source from RTL IQ-stream?
As far as I understand: When using a RTL-SDR the IQ stream (based on the SDR-clock) is not exactly the same as the clock of system running gnuradio.
The illustrated source does not exists, but it ...
- 81
0
votes
0
answers
60
views
Having trouble with rtl-sdr-v4 frequency scanner
I am attempting to make a frequency scanner that outputs an array of frequencies but I do not know how to do anything with any of these libs as I'm not an advanced Python programmer anymore, main ...
- 3
1
vote
1
answer
852
views
How to fix rtl-sdr usb_claim_interface error -6?
I tried to enter this command to the terminals
sudo rtl_fm -f 105900000
it returns this output
Found 1 device(s):
0: Realtek, RTL2838UHIDIR, SN: 00000001
Using device 0: Generic RTL2832U OEM
...
0
votes
1
answer
49
views
How do I use cumulative data to show an hourly total?
I'm logging data from my gas meter using rtlamr to InfluxDB 1.6.7. The gas meter periodically transmits its consumption in a running total, so it looks like this (for example):
100
100
101
101
102
105
...
- 829
0
votes
1
answer
185
views
error on installing PyQt5 in virtual environment
Currently i'm working on a python-based Qt project in Raspberry Pi 4, using RTL-SDR and Neo GPS module. I was suggested to install pyrtlsdr and pyserial in order to read those devices, but the rpi OS ...
0
votes
1
answer
595
views
GNU Radio RTL-SDR command syntax
I would like to be able to control the RTL_SDR GNU Radio block via its "command" port, but I'm unable to find a reference to the protocol this input accepts. In particular I would like to ...
- 271
1
vote
0
answers
286
views
Terminating an asyncio loop with RTL-SDR after N seconds
I'm building a function to allow a user to stream RTL-SDR data for N seconds.
Attempt 1
Currently, my script uses two functions, one of which monitors timeout conditions and signals the program to ...
- 1,144
1
vote
1
answer
153
views
Can not get any time/freq domain plots to show after execution
Very new to GNUradio. I started with tutorials - and in the very first tutorial, when the program runs the new tab opens but nothing is plotted. Screenshots below :
Flowgraph:
Execution tab:
Any ...
2
votes
1
answer
3k
views
Installing SoapySdr modules for RTL-SDR or AirSpy
I am trying to build and run the simple example for SoapySdr as found here https://github.com/pothosware/SoapySDR/wiki/C_API_Example. I can use the SDR with Gnuradio but that doesn't work for my ...
- 49
0
votes
1
answer
195
views
Gnuplot: plot not updated
in a script bash, here is what I do:
Every 3 minutes, I create binary data for one minute to get a waterfall. The following command creates two files: plot.met and plot.bin.
rtl_power_fftw -f ...
- 41
-1
votes
1
answer
146
views
Gnuplot: line 0: no previous plot
I am trying to save the Gnuplot plot in PNG that I get with my SDR and a tool named rtl_power_fftw.
This command displays my plot on the screen but I want to save it in PNG:
rtl_power_fftw -f 900M:...
- 41
-1
votes
1
answer
216
views
rtl_433 command output will not pipe to php script
I'm trying to get the output from the rtl_433 command into a php script.
If I run echo TEST | php sensors.php
I get
STARTING PHP SCRIPT
DATA FROM PHP SCRIPT IS: TEST
sensors.php is just this
<?php
...
- 1,074
1
vote
1
answer
350
views
Issues with QPSK modulation & Demodulation
Im trying to create a simple QPSK modulator and demodulator in GNURadio using a hackrf and pluto SDRs. Im trying to modulate and send a file containing "1234" over to my other device and ...
-1
votes
1
answer
238
views
How to use multiple commands and pass data between them using subprocesses in Python?
I am trying to run the code rtl_fm -f 162.475M -M fm -s 22050 -E dc -p 0 - | multimon-ng -t raw -a EAS in Python, but I can't get the data from RTL_FM to pass to Multimon-ng. Am I doing something ...
- 11
0
votes
1
answer
409
views
How to plot real time graph using python for the signals received from RTL SDR without closing the plot?
I want to plot graph of signal from RTL-SDR dongle but couldn't plot continuously at the same window without closing
Here's the code that i tried,
from pylab import *
from rtlsdr import *
from time ...
- 31
0
votes
1
answer
915
views
QtAndroid: Grant Usb Permission in Android with Qt6
in android programming you need to get usb permission before working with connected device to client device.
i am trying to connect a hack-rf to android device and use it... but first of all i need to ...
- 114
0
votes
0
answers
105
views
Meteor spectrogram from wave files
I am using SpectrumLab for logging meteors with an SDR. SpectrumLab records waterfall screenshots and a wav file of an event. I am trying to reproduce the waterfall screenshot of SpectrumLab from the ...
- 2,520
2
votes
0
answers
287
views
How to normalize amplitude differeces within the 433Mhz signal burst in GNU Radio Companion?
I'm learning SDR by trying to decode different 433Mhz keyfob signals.
My initial flow for capture and pre-processing looks like this:
What I get on the sink is:
I guess the bits are visible fine and ...
- 1,280
0
votes
1
answer
732
views
pyrtlsdr installation Windows 10
I am trying to install pyrtlsdr, I first installed SDRUno and checked whether my SDRPlay is connected and working fine. That's ok. Then I try to install pyrtlsdr with pip on Windows 10 with Python 3....
- 2,520
1
vote
0
answers
121
views
How to execute an async function in a different thread?
I want to execute powers sync function in a different thread and group the returned value from powers whenever I need it in my main script. I have tried the Threading module of python, but it didn't ...
0
votes
1
answer
274
views
How to get the returned value from asyncio loop?
I'm trying to measure the power level of the signal captured by rtl sdr dongle and then compare several measurements to get the best level of power, but I don't know exactly how to return instantly ...
0
votes
0
answers
706
views
Find a algorithm to identify a plateau
I've got the following set of data :
As you can see, I've got two plateau at 1987 and 3757. The problem is I can't find a good algorithm in order to extract them.
I've already tried this algo, ...
1
vote
2
answers
941
views
CRC16-CCITT for shipborne AIS
I am trying to decode an AIS transmission and validate it by checking CRC code.
However, I am not sure of the sequence of steps, nor the expected result.
My question is, can anyone tell me the correct ...
- 41
1
vote
0
answers
803
views
Adalm Pluto works on Ubuntu but NOT on Ubuntu Server 20.04 LTS
I'm running ubuntu server and have tried installing libiio packages from both source and apt-get repositories. I can detect the adalm pluto sdr device with iio_info -s (as root because I have not ...
- 294
1
vote
1
answer
305
views
Airspy and RTLSDR on same Raspberry pi4 with USB SSD - I/O Error
This is my setup
Raspberry PI4 with 8 GB RAM; boot via Sata SSD (in enclosure) connected via USB3
1 USB2 extension cable + Hub which goes to 1 RTLSDR dongle (for ADS-B) and 1 Airspy Mini (for ATC ...
- 673
0
votes
1
answer
717
views
Trouble piping to curl through sed
I have a program, rtl_433, that outputs lines of JSON - maybe once or twice a minute, while it's running. I need to pipe that data as HTTP POST data to curl.
What complicates matters is that this ...
- 419
1
vote
0
answers
397
views
Need to convert tuple into bytes for pyaudio
Working with RTL_SDR I'm trying to play a frequency using python. I can get audio to come from the speakers on a simplified script that doesn't demodulate the FM signal. However when running a code to ...
- 815
0
votes
1
answer
135
views
is it possible to use android cellphones Telecommunication hardware to transmit and receive radio messages?
Is there a way to turn android phone 4G hardware to a module that can transmit any radio messages or make p2p connection with another phone?
0
votes
1
answer
211
views
SOX exiting unusually, as if the user is canceling
I am trying to read a FM signal and piping it to sox. This is exiting unusually. Any idea what's going on?
Thanks.
$ rtl_fm -f $137M -s 60k -g 45 -p 55 -E wav -E deemp -F 9 - | sox -t wav - abc.wav ...
- 1,400
0
votes
1
answer
1k
views
gnuradio: How to change the bandwidth of a source?
I have designed a receiver+FSK demodulator with an osmocom source and it works as it should (sometimes - as I'm finding the results to be somewhat incoherent, but I suspect that might be the ...
0
votes
1
answer
990
views
ubuntu - GNU-RADIO - cmake could not find MPIR
I'm trying to get a RTL-SDR source block (or osmo sdr, since they both work) in GNU Radio, and it apparently must be obtained via the following command lines:
git clone git://git.osmocom.org/gr-...
- 75
2
votes
3
answers
13k
views
Could not find any WX GUI blocks in GNU Radio. How to install it?
Hey I have installed GNU Radio and I could not find any WX GUI blocks in GNU Radio Companion :-(
How can I install them? I surely need them because most of my projects need WX GUI Blocks…
Hope someone ...
- 91
1
vote
1
answer
1k
views
How can I do a bandpass filter for a specific frequency using rtlsdr as the source?
I am still very new to python and the world of rtlsdr but have a project I'm working on with a Raspberry Pi to essentially trip warning lights when a radio signal is heard.
At a high level, my project ...
- 21
0
votes
1
answer
258
views
Using RTL and USRP for DSB modulation/demodulation
to understand GNURadio and the SRD world step by step, I tried to realize a first flowgraph to simulate a DSB modulator/demodulator. The signal is an audio file rec by the audio sink block at 32000 Sa/...
- 23
0
votes
1
answer
4k
views
PlutoSDR AttributeError: module 'iio' on Ubuntu 20.04
When attempting to run flow graph in GNU Radio Companion, I get the following error:
AttributeError: module 'iio' has no attribute 'pluto_source'
I am running a new VMWare environment, on Windows, for ...
- 653
1
vote
2
answers
2k
views
rtl_433 on raspberry pi: Send data to api via http post
I'm receiving the weather data from my weather station with a dongle on my raspberry pi, that has internet connection via wifi. Now I want to send this data to a rails api/app to save it there in a ...
- 453
2
votes
1
answer
2k
views
RTL-SDR in GNU Radio 3.9
I'm trying to make the RTL-SDR receive WBFM through GNU Radio (with Ubuntu 20.04), with this flowgraph:
GNU Radio flowgraph
But when I execute, it gives me this error message:
gr-osmosdr 0.2.0.0 (0.2....
- 31
6
votes
2
answers
20k
views
fatal error: libusb/libusb.h: No such file or directory librtlsdr install for GNU radio
Trying to install rtl-sdr (through git clone git://git.osmocom.org/rtl-sdr.git) thanks to the instructions here but can't go further than make in the first sequence of instructions:
cd rtl-sdr/
mkdir ...
- 1,091
0
votes
0
answers
191
views
syncronization of multiple raspbery pi sensors
i have a little project i am working on in which i need to measure the time difference between several raspberry pi modules in the matter of nano seconds. my question is what timing mechanism can ...
0
votes
1
answer
1k
views
Python: IMPORT ADI in Intellij
I bought a PlutoSDR and I am running Windows 10. I do not know how to import adi into my IDE in Windows. (Linux VM works)
Non-essential background. Can Skip to Bottom:
I upgraded my firmware on the ...
- 653
1
vote
1
answer
1k
views
Store data in ( .wav) format from RTL-SDR device using c#
I am able to connect with RTL-SDR using librtlsdr.dll and libusb-1.0.dll by using (https://github.com/nandortoth/rtlsdr-manager) wrapper in c# .netcore3.0 .
Started getting sampledata from device by ...
- 89
1
vote
0
answers
118
views
Parse GMS Packet with GoPacket
I tried this code (below) for sniffing GSM packet with rtl-sdr device:
import rtl "github.com/jpoirier/gortlsdr"
var buffer = make([]uint8, rtl.DefaultBufLength)
for{
rtl.ReadSync(...
- 327
1
vote
0
answers
115
views
Qt cannot find library
I'm currently trying to make a simple app for Android using Qt. The app should comunicate with a rtlsdr dongle using the librtlsdr. I managed to compile this library for android obtaining the .so file....
- 11
0
votes
2
answers
592
views
Cannot get the 'FM_receiver' sample gnuradio code to work
I am trying to get the sample code for the 'FM_receiver' sample code working with my limeSDR and it seems not to pickup anything. Here's some screenshots of my gnuradio and its output:
I have it ...
- 1,914
4
votes
1
answer
5k
views
GNU Radio (Companion) gives Python Syntax Error on variable substitution
I'm trying out GNU Radio (Compantion) for the first time right now, having bought an RTL SDR (the SDR SMARt from NooElec) and trying to build a simple FM radio. I have a (reasonably correct) flowgraph ...
- 368
0
votes
1
answer
71
views
start and stop a linux shell command from a c program without blocking current execution
while(variable > 0){
updatevariable(); //variable gets updated from UDP serevr.
// i want to execute a shell command here without blocking current execution.
}
i tried using system() function ...
0
votes
2
answers
2k
views
RTL2832U: Building a FM Receiver with GNC on Windows
I have been using SDRSharp for quite some time, listening to various stations, and I wanted to divulge more into how I can create tools using GNURadio.
I downloaded GNURadio Companion 3.8.0.0 and ...
- 653
-2
votes
2
answers
90
views
Is there a way to modulate signal looks like some mammal voice?
I want to send an audio message which actually looks like some mammal voice but inside it has some coded information, something like Hello !.
I know basically modulation is super-imposing your ...
- 1,418
1
vote
0
answers
406
views
sox silence : newfile : restart not working right/as expected
I have a live radio feed I am trying to capture using rtl_fm and SoX. The source comes in random bursts a few hours long with gaps of days or weeks between events. I would like to capture each of the ...
- 11