RTL-SDR Blog V4 — USB Software Defined Radio Dongle

The RTL-SDR Blog V4 is the definitive entry-level software defined radio receiver. Plug it into a USB port, install SDR# or SDR++, and begin receiving signals from aircraft transponders (ADS-B), weather satellites (NOAA APT), FM/AM radio, shortwave broadcasts, and amateur radio bands — all without any hardware modifications.

The V4 incorporates a redesigned front-end with an integrated bias-tee (500mA), improved filtering, and a new direct-sampling mode for HF reception down to the AM broadcast band without an upconverter. The upgraded clock crystal delivers significantly lower drift than generic RTL dongles, making it suitable for DMR decoding and other precision applications.

• Frequency range: 500kHz–1766MHz (direct sampling + normal mode)
• Sample rate: up to 3.2 MSPS (2.56 MSPS stable)
• Integrated 4.5V bias-tee (software switchable)
• HF direct sampling mode (500kHz–28.8MHz)
• TCXO clock for improved frequency stability
• SMA female antenna connector
• Includes dipole antenna kit and R820T2 tuner