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RTL-SDR Blog V4

Note

The Pironman 5 series products do not include the following modules. You need to prepare one yourself or purchase it from our official website:

This guide covers a reliable installation procedure for the RTL-SDR Blog V4, a popular and affordable USB software-defined radio (SDR) receiver. The V4 version features an improved R828D tuner, direct sampling mode, better sensitivity, and integrated bias-tee for powering active antennas. It works well for receiving broadcast FM, airband, amateur radio, ADS-B, and many other signals on Linux and Raspberry Pi systems.

For the original manufacturer’s documentation, see the official RTL-SDR Blog V4 guide: https://www.rtl-sdr.com/V4/

Install Driver for RTL-SDR Blog V4

0. Preparation

sudo apt update
sudo apt install -y git cmake build-essential pkg-config libusb-1.0-0-dev sox
Note:

sox (provides the play command) is included for direct audio testing.

1. Full Cleanup of Old Libraries and Binaries (Critical)

sudo apt purge -y 'librtlsdr*'
sudo rm -rf /usr/lib/librtlsdr* /usr/include/rtl-sdr* \
            /usr/local/lib/librtlsdr* /usr/local/include/rtl-sdr* \
            /usr/local/include/rtl_* /usr/local/bin/rtl_*
sudo ldconfig

Verification A:

ldconfig -p | grep rtlsdr || echo "OK: No librtlsdr found in system cache."

2. Build and Install RTL-SDR Blog V4 Driver

cd ~
git clone https://github.com/rtlsdrblog/rtl-sdr-blog.git
cd rtl-sdr-blog
mkdir build && cd build
cmake .. -DINSTALL_UDEV_RULES=ON
make
sudo make install
sudo cp ../rtl-sdr.rules /etc/udev/rules.d/
sudo ldconfig

Verification B:

which rtl_test
ldd "$(which rtl_test)" | grep rtlsdr   # Should point to /usr/local/lib/librtlsdr.so

3. Disable DVB Kernel Module and Reboot

echo 'blacklist dvb_usb_rtl28xxu' | sudo tee /etc/modprobe.d/blacklist-dvb_usb_rtl28xxu.conf
sudo reboot
Note:

Immediate reload commands (udevadm control --reload-rules and udevadm trigger) are optional if you plan to reboot immediately.

4. Verify Driver After Reboot

rtl_test -t
Expected:

Output should include RTL-SDR Blog V4 Detected with no [R82XX] PLL not locked! messages. The line Using device 0: Generic RTL2832U OEM is normal β€” it is just the USB name.

6. Test FM Reception from Command Line

rtl_fm -f 97.1M -M wbfm -s 180000 -r 48000 -g 28 | play -t raw -r 48k -e s -b 16 -c 1 -

Tips:

  • -g: Try between 25–35 dB; higher is not always better.

  • Reduce -s to ~170k–180k to lower noise.

  • Adjust frequency slightly (e.g. 97.1005M) for fine tuning.

  • Close any other SDR software that might hold the device.

Installing Common Radio Software

This section introduces four widely used SDR applications, with short descriptions, installation instructions, and basic setup tips for Debian-based systems.

GQRX

GQRX is a simple, user-friendly SDR receiver application with a graphical interface. It supports a wide range of SDR devices and is ideal for listening to FM, AM, SSB, and other signals with real-time spectrum and waterfall displays.

You can also refer to the official Raspberry Pi installation guide here: https://www.gqrx.dk/download/gqrx-sdr-for-the-raspberry-pi

Option 1 – Quick Installation (Recommended for most users)

Fast, simple, and integrates with system updates β€” but may not be the latest version.

sudo apt update
sudo apt install -y --no-install-recommends gqrx-sdr

Option 2 – Build from Source (Optional, Latest Features)

Ensures the latest version and full customization, but takes longer to compile and requires more dependencies.

sudo apt update

sudo apt-get install -y --no-install-recommends \
  cmake gnuradio-dev gr-osmosdr qt6-base-dev qt6-svg-dev \
  libasound2-dev libjack-jackd2-dev portaudio19-dev libpulse-dev

git clone https://github.com/gqrx-sdr/gqrx.git
cd gqrx
mkdir build && cd build
cmake ..
make
sudo make install

Preventing Driver Overwrite

When installing GQRX, SDR++, gnuradio-dev, or gr-osmosdr, the system may reinstall outdated librtlsdr. After each installation, check:

ldd "$(which rtl_test)" | grep rtlsdr

If it no longer points to /usr/local/lib/librtlsdr.so, run:

sudo apt purge -y 'librtlsdr*'
sudo ldconfig
cd ~/rtl-sdr-blog/build && sudo make install && sudo ldconfig

You can test immediately (or after a reboot for a clean environment):

rtl_test -t

Expected output:

  • Contains RTL-SDR Blog V4 Detected.

  • No [R82XX] PLL not locked! messages.

First Run Setup

  • I/O Devices:

    • Device: RTL-SDR (V4).

    • Input Rate: 1.8 MSPS (1800000).

  • Input Controls:

    • LNA Gain: Start around 25–35 dB, adjust as needed

  • Receiver Options:

    • Set Frequency Correction (PPM) from your calibration.

    • Mode: WFM (mono or stereo) for broadcast FM.

SDR++ (SDRpp)

SDR++ is a modern, fast, cross-platform software-defined radio (SDR) receiver that supports a variety of devices, including the RTL-SDR Blog V4. It offers a clean, user-friendly interface, wide modulation support, advanced DSP filtering, and recording capabilities.

You can refer to the official user manual here: https://www.sdrpp.org/manual.pdf

Install from Source

sudo apt update
sudo apt install -y --no-install-recommends build-essential cmake git pkg-config \
  libfftw3-dev libvolk2-dev libglfw3-dev libglew-dev \
  libzstd-dev librtaudio-dev

git clone https://github.com/AlexandreRouma/SDRPlusPlus
cd SDRPlusPlus
mkdir build && cd build
cmake .. -DOPT_BUILD_RTL_SDR_SOURCE=ON
make
sudo make install

Preventing Driver Overwrite

When installing GQRX, SDR++, gnuradio-dev, or gr-osmosdr, the system may reinstall outdated librtlsdr. After each installation, check:

ldd "$(which rtl_test)" | grep rtlsdr

If it no longer points to /usr/local/lib/librtlsdr.so, run:

sudo apt purge -y 'librtlsdr*'
sudo ldconfig
cd ~/rtl-sdr-blog/build && sudo make install && sudo ldconfig

You can test immediately (or after a reboot for a clean environment):

rtl_test -t

Expected output:

  • Contains RTL-SDR Blog V4 Detected.

  • No [R82XX] PLL not locked! messages.

First Run Notes:

After installation, SDR++ will appear in your desktop menu (usually under β€œOther”), or you can run:

sdrpp

  • Device: Select RTL-SDR (V4) in the Source menu.

  • Sample Rate: 1.8 MSPS is typical; lower if CPU load is high.

  • Gain: Disable AGC and set manual gain (start ~35 dB).

  • PPM Correction: Enter your calibration value from rtl_test -p.

  • Demodulation Mode: Choose WFM for FM broadcast, SSB for amateur bands, etc.

rtl_433

rtl_433 is a command-line tool to decode radio transmissions from devices operating in the 433 MHz ISM band, such as weather stations, tire pressure sensors, and wireless thermometers.

Install:

sudo apt install -y rtl-433

Preventing Driver Overwrite

When installing GQRX, SDR++, gnuradio-dev, or gr-osmosdr, the system may reinstall outdated librtlsdr. After each installation, check:

ldd "$(which rtl_test)" | grep rtlsdr

If it no longer points to /usr/local/lib/librtlsdr.so, run:

sudo apt purge -y 'librtlsdr*'
sudo ldconfig
cd ~/rtl-sdr-blog/build && sudo make install && sudo ldconfig

You can test immediately (or after a reboot for a clean environment):

rtl_test -t

Expected output:

  • Contains RTL-SDR Blog V4 Detected.

  • No [R82XX] PLL not locked! messages.

Basic Use:

  • Run rtl_433 to automatically detect and decode common 433 MHz devices.

  • Use rtl_433 -G to list all supported protocols.

dump1090-mutability

dump1090-mutability is a Mode S decoder for ADS-B aircraft transponder data. It receives and decodes aircraft positions, speeds, and other flight data, and can serve a live map via a web browser.

Install:

sudo apt install -y dump1090-mutability

Preventing Driver Overwrite

When installing GQRX, SDR++, gnuradio-dev, or gr-osmosdr, the system may reinstall outdated librtlsdr. After each installation, check:

ldd "$(which rtl_test)" | grep rtlsdr

If it no longer points to /usr/local/lib/librtlsdr.so, run:

sudo apt purge -y 'librtlsdr*'
sudo ldconfig
cd ~/rtl-sdr-blog/build && sudo make install && sudo ldconfig

You can test immediately (or after a reboot for a clean environment):

rtl_test -t

Expected output:

  • Contains RTL-SDR Blog V4 Detected.

  • No [R82XX] PLL not locked! messages.

Basic Use:

  • Run: dump1090 --interactive --net.

  • Open http://<raspberrypi-ip>:8080 in your browser to view live aircraft tracking.