gnuradio
rtl_433
gnuradio | rtl_433 | |
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22 | 172 | |
4,796 | 5,774 | |
0.7% | - | |
9.4 | 9.3 | |
7 days ago | 9 days ago | |
C++ | C | |
GNU General Public License v3.0 only | GNU General Public License v3.0 only |
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gnuradio
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Upsampling in Gnuradio is necessary?
In gr-dtv transmitter examples for Gnuradio, I see some times people use a resampler block before the RF hardware sink. Say our sampling rate is ~9.14Msps which satisfies the Nyquist criterion because our samples are complex numbers.
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Capturing FM using SDR
2.1. Thanks for that tip, I forgot that I was able to check the source code of the WBFM Receive block. As you have said, there are mostly the same. There are some differences between how values are picked. The WBFM Receive block would be a synonym of Quadrature demod => Fir Filter (decimation => Low pass filter) => FM Deemphasis. 2.3. My question there is why 10 and not 20 or 100. I understand that the idea is to reduce the sample rate asap, but what I don't understand is why those values were picked and how can I understand what would be the "correct" or "best" value. 2.4. I'm not fully understanding what you said. If I check the WB FM recieve source code the values that are supplied as the cutoff freq and transition width of the Low pass filter differ from the one of the example. The webfm would apply a sample rate / decimation / 2 - sample rate / decimation / 32 as a cutoff freq and a sample rate / decimation / 32 as a transition transition width. Calculating those values would end up in different that the ones supplied in this second example. Again, is there a rule of thumb to pick these values?.
- Hello everyone! I would like to install and run GNU Radio version 3.7.4 in order to follow along with The HackRF GNU Radio tutorial on greatscottgadgets.com/sdr/ but I can’t find prior releases to install. Can anyone help?
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Multi band gfsk demodulation with Nooelec RTL-SDR v5 SDR and gnu radio
Gaussian filter is used only on the tx side, so specifying bt in the receiver makes no sense. Take a look at gfsk mod/demod blocks implementation: https://github.com/gnuradio/gnuradio/blob/master/gr-digital/python/digital/gfsk.py
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What would you rewrite in Rust?
GNU Radio
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Is there a way to delay a signal in time-domain?
Here's the filter coefficients used for the GNU-Radio interpolator block to get you started. This is a 7th order interpolator (i.e., 8 FIR taps) with very good performance. Each "row" of the array sets the delay in steps of sample_time / 128.
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My grandpa is a huge HAM radio fan, so I showed him GNU Radio. Got this text the day he got back home.
From their README: “open-source software development toolkit that provides signal processing blocks to implement software radios.” https://github.com/gnuradio/gnuradio
- The future is now ... again
- GNU Radio
- GNU Radio – the Free and Open Software Radio Ecosystem
rtl_433
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Reverse engineering a car key fob signal
And there's a multiformat receiver block too: https://github.com/merbanan/rtl_433
- What is this signal?
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Error handling in a failing service
pi@pi4b8:/etc/systemd/system $ cat rtl_433.service # based on https://github.com/merbanan/rtl_433/issues/1651 [Unit] Description=RTL_433 service script StartLimitIntervalSec=5 Documentation=https://github.com/merbanan/rtl_433/README.md After=syslog.target network.target [Service] Type=exec ExecStart=/usr/bin/rtl_433 -C si -F mqtt # Restart script if stopped Restart=always # Wait 30s before restart RestartSec=30s # Tag things in the log # View with: sudo journalctl -f -u rtl_433 -o cat SyslogIdentifier=rtl_433 StandardOutput=syslog StandardError=syslog [Install] WantedBy=multi-user.target
- seeking help with 433Mhz remote integration
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Create a subghz file from known data?
For example, rtl_433 has the spec for an X10 sensor say I know what data I want to put where, is there some tool/site I could enter in what the "specifications" of the signal waveform are and the data I want to send as a byte-string or binary-string and it would create a playable .sub file for me?
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New Guy: Outdoor Thermostat / automated fan start/stop.
For "outdoor distances" I'd probably stick to something LoRa or 433MHz based. YoLink has quite a few options using the LoRa protocol. I use basic 433Mhz based AcuRite sensors paired with an RTL-SDR dongle connected to a machine running RTL_433, and use Home Assistant to trigger automations and alerts.
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Mystery signal?
866-868MHz is SRD/ISM band (in UK/EU). Can be things like energy meters, TPMS, medical devices etc. Try rtl_433 on it.
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Problem trying to listen to a Honeywell doorbell (RF 868 Mhz) with RTL-433
I'm trying to add a Honeywell doorbell to Home Assistant by using the RTL-433 GitHub project/program. When I run the program the SDR dongle is detected but it doesn't display anything when I press the doorbell (the image shows what I see after running the program and pressing the doorbell). I have also tried Honeywell Activelink (FSK) aka [116], so I have tried both 115 and 116 decode protocols.
- Elster TPR11 water meter reader
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Next Mileston for an RTL-SDR newbee?
rtf_433 IoT & embedded device signal receiving https://github.com/merbanan/rtl_433
What are some alternatives?
PothosSDR - Pothos SDR windows development environment
rtl-wmbus - Software defined receiver for wireless M-Bus with RTL-SDR
SDRPlusPlus - Cross-Platform SDR Software
rtlamr - An rtl-sdr receiver for Itron ERT compatible smart meters operating in the 900MHz ISM band.
Node RED - Low-code programming for event-driven applications
ESPHome-VideoDoorbell - Doorbell made using ESPHome with a TTGO T-Camera
gnss-sdr - GNSS-SDR, an open-source software-defined GNSS receiver
mayhem-firmware - Custom firmware for the HackRF+PortaPack H1/H2
sdrangel - SDR Rx/Tx software for Airspy, Airspy HF+, BladeRF, HackRF, LimeSDR, PlutoSDR, RTL-SDR, SDRplay RSP1 and FunCube
srsRAN_4G - Open source SDR 4G software suite from Software Radio Systems (SRS) https://docs.srsran.com/projects/4g
multimon-ng