Check Console for Details:

Press F12 to open DevTools and check the Console tab for detailed debugging information.

VHF/UHF RTL-SDR Scanner

📻 VHF/UHF RTL-SDR Scanner

Disconnected - Click Connect to start
---.--- MHz

Frequency Control

Receiver Settings

20%
50%
✓ Automatic (Enabled)

⚠️ Requirements

• RTL-SDR USB dongle connected to your computer

• Chrome, Edge, or Opera browser (WebUSB support)

• Windows users: Install Zadig and select WinUSB driver for "RTL2832U"

• Linux users: May need to add udev rules (see troubleshooting)

💡 How to Connect

  1. Click "Connect RTL-SDR" button above
  2. Click on your RTL-SDR device in the list (it will highlight)
  3. Click the "Connect" button in the dialog (not Cancel)
  4. Your device should show as "RTL2832U" or "RTL2838UHIDIR"

Tip: Press F12 to open DevTools Console for debugging info

🔧 Troubleshooting Connection Issues (Click to expand)

Common Issues:

"No device selected" Error:

  • You must CLICK on the device to select it (highlight it)
  • Then click "Connect" button, not "Cancel"
  • Just seeing the device in the list isn't enough

Device not appearing in list:

  • Unplug and replug the RTL-SDR
  • On Windows: Install Zadig and select WinUSB driver
  • Close any SDR software (SDR#, CubicSDR, etc.)
  • Try a different USB port

"Control transfer error":

  • Windows: Check Zadig - select "RTL2832U" and install WinUSB driver
  • Linux: Add user to plugdev group: sudo usermod -a -G plugdev $USER
  • Linux: Create udev rule: echo 'SUBSYSTEM=="usb", ATTRS{idVendor}=="0bda", ATTRS{idProduct}=="2838", MODE="0666"' | sudo tee /etc/udev/rules.d/20-rtlsdr.rules
  • All OS: Try a different USB port (USB 2.0 may work better than 3.0)
  • Close all other SDR software (SDR#, GQRX, CubicSDR)
  • Unplug device, wait 5 seconds, replug

Important Note about WebUSB Limitations:

WebUSB has limited support for RTL-SDR control transfers. If you get "control transfer error":

  • This is a known WebUSB limitation with some RTL-SDR devices
  • The device may still work in "read-only" mode
  • Try clicking "Start Scanning" anyway - it might receive with default settings
  • For full control, consider using native SDR software like SDR# or GQRX
  • The working web app at radio.ea1iti.es uses similar workarounds

Check Console for Details:

Press F12 to open DevTools and check the Console tab for detailed debugging information.