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RTL-SDR

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If not working after reboot with dongle plugged in in back port ...

• You cannot use the default repository drivers.
  The RTL-SDR V4 requires a newer, modified driver branch containing the necessary upconverter and tuner logic.
  Follow this complete step-by-step pipeline to purge conflicting TV drivers, compile the V4 drivers, and get your software running.
  
• 1. Purge Old Drivers
  Standard Linux repositories distribute an older driver branch that will cause the V4
  to output only static or fail entirely.Open your terminal.
  Remove any pre-installed RTL-SDR packages.
  sudo apt purge ^librtlsdr
sudo apt autoremove

• 2. Install Build Dependencies
  You must compile the official RTL-SDR Blog V4 Drivers from source.
  Install the required build tools first:
  sudo apt update
sudo apt install libusb-1.0-0-dev git cmake pkg-config build-essential

• 3. Clone and Build the V4 DriverExecute these commands sequentially to clone the correct driver
  branch, compile it, and install it to your system:
  git clone https://github.com/osmocom/rtl-sdr
cd rtl-sdr-blog
mkdir build
cd build
cmake ../ -DINSTALL_UDEV_RULES=ON
make
sudo make install

• 4. Reload Rules and Blacklist TV DriversLinux Mint will mistake your SDR for a generic USB DVB-T television
  dongle and block access to it.Copy the hardware rules to your system:
  sudo cp ../rtl-sdr.rules /etc/udev/rules.d/

• 5. Blacklist the default kernel TV module by creating a configuration file:
  echo "blacklist dvb_usb_rtl28xxu" | sudo tee /etc/modprobe.d/blacklist-rtl.conf

• Reboot your Toughbook CF-31.
  
• 5. Verify the Connection
  Plug your RTL-SDR V4 into a USB port. Test if the system
  initializes the hardware correctly by running:
  rtl_test


GQRX

Linux Mint 22.3 Cinnamon provides native support for RTL-SDR devices, as the underlying Ubuntu base includes the necessary drivers and kernel modules. The most critical requirement is ensuring the RTL2832U chipset is supported; while RTL2832U dongles work out-of-the-box, older or specific IT9135 or AF9033 chipsets often lack the required direct-sampling mode and are incompatible.

Working !!

Plugging and unplugging nooelec does not deref libraries

• Download
• Open gqrx
• Open record\play
  
• Select
• Play

gqrx -r

Output:

The error libusb_claim_interface error -6 (LIBUSB_ERROR_BUSY) occurs because the USB device (device 2.1) is already claimed by an active Linux kernel driver or another application instance. The warning [libusb_exit] device 2.1 still referenced indicates that the application exited without properly releasing the interface, leaving the driver bound to the device.

groups
Output:
emcomm adm tty uucp dialout cdrom sudo audio dip www-data plugdev users lpadmin sambashare lsusb | grep -i dVB
Output
Bus 002 Device 072: ID 0bda:2838 Realtek Semiconductor Corp. RTL2838 DVB-T
ls -l /dev/bus/usb/002/072
Output:
crw-rw----+ 1 root plugdev 189, 199 Jul 26 07:54 /dev/bus/usb/002/072

            # Download the official rules file
wget -O /tmp/rtl-sdr.rules https://raw.githubusercontent.com/osmocom/rtl-sdr/master/rtl-sdr.rules

# Move to the udev directory
sudo cp /tmp/rtl-sdr.rules /etc/udev/rules.d/99-rtl-sdr.rules

# Reload udev rules and trigger them
sudo udevadm control --reload-rules
sudo udevadm trigger   
          

Note: Some setups also require blacklisting rtl2832 and rtl2830. If the above alone fails, append them: echo -e 'blacklist dvb_usb_rtl28xxu\nblacklist rtl2832\nblacklist rtl2830' | sudo tee /etc/modprobe.d/rtl-sdr-blacklist.conf
Update Initramfs (Optional but Recommended) On some Mint/Ubuntu versions, updating the initial ram filesystem ensures the blacklist is applied early in the boot process:
sudo update-initramfs -u

On Linux Mint 22.3, the directory /usr/share/rtl-sdr typically does not exist because modern RTL-SDR installations place configuration files, examples, and scripts in /usr/local/share/rtl-sdr or /usr/share/rtl-sdr is only created if you manually install specific legacy packages or run the make install step from source without the correct prefix
If you are following a guide that references this path, it is likely outdated or refers to the source installation directory. Here is how to resolve missing files or paths:

Users typically install Gqrx, SDR++, or CubicSDR via the default repositories or Flatpak for a graphical interface. In modern Mint versions, manual udev rule configuration and driver blacklisting are frequently unnecessary, as the system handles device detection automatically. If a dongle is not recognized, verifying the chipset with lsusb and checking for conflicting DVB-T drivers via lsmod remains the standard troubleshooting step.

To ensure you are not forcing Direct Sampling on the Nooelec NESDR SMArt v5 (RTL2832U), you must keep the sampling mode set to normal (I-branch) in your SDR software (such as SDR#, SDR++, or GQRX). Direct Sampling is a specific mode used to bypass the tuner for HF reception below 24 MHz; forcing it while trying to receive VHF/UHF frequencies or when using the standard R820T2 tuner will result in no signal or poor performance, as the device is designed to use the internal tuner for frequencies above ~25 MHz.

• Software Settings: In SDR#, do not check the "Direct Sampling" box. In SDR++, ensure the device string does not contain direct_samp=Q or direct_samp=1. In GQRX, do not add direct_samp=2 to the device parameters.
• Hardware Configuration: The Nooelec V5 uses the R820T2 tuner for standar d operation. Forcing Direct Sampling bypasses this tuner and the low-noise amplifier (LNA), which is only intended for specific low-frequency HF use cases.
• Correct Usage: For frequencies above 25 MHz, always use normal tuning. Only enable Q-branch Direct Sampling if you specifically intend to receive Shortwave (HF) signals below 24 MHz without an upconverter.

• Direct sampling is disabled when direct_samp=2 is omitted from the GQRX device parameters

  • Standard Operation: Without this parameter, the RTL-SDR dongle operates in its default mode, which is typically limited to VHF/UHF frequencies (above ~24 MHz).

  • HF Reception: To receive HF signals (below 24 MHz) using the Q-channel, you must explicitly add direct_samp=2 to the device string (e.g., rtl=0,direct_samp=2).

  • Alternative Values: Depending on the specific driver installation, some systems may require direct_samp=1 (I-channel) or direct_samp=3 for HF direct sampling.

Blacklist dvb_usb_rtl28xxu

sudo nano /etc/modprobe.d/blacklist.conf

            rtl_test
Found 1 device(s):
  0:  Nooelec, NESDR SMArt v5, SN: 38419778

Using device 0: Generic RTL2832U OEM
Found Rafael Micro R820T tuner
Supported gain values (29): 0.0 0.9 1.4 2.7 3.7 7.7 8.7 12.5 14.4 15.7 16.6 19.7 20.7 

22.9 25.4 28.0 29.7 32.8 33.8 36.4 37.2 38.6 40.2 42.1 43.4 43.9 44.5 48.0 49.6 
[R82XX] PLL not locked!
Sampling at 2048000 S/s.


          

While the Linux SDR API was committed to the media tree in February 2014 for inclusion in kernel 3.15, it does not block access to RTL-SDR devices; rather, it provides a standardized kernel driver for them.
The kernel creates a specific device node, typically /dev/swradio0, for SDR functions, distinct from the /dev/dvb/adapter0/frontend0 node used for DVB-T television reception.

Users can utilize both DVB-T and SDR functionalities on RTL2832U based sticks, but they cannot operate simultaneously because the device's hardware resources are shared. Accessing the SDR capabilities via the kernel API allows applications to run without root privileges and offers standard streaming methods, whereas traditional librtlsdr tools like rtl_sdr or rtl_tcp interact directly with the hardware via USB.

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