Get started with Software Defined Radio SDR for $20 - YouTube
Nooelec - Nooelec NESDR SMArt HF Bundle: 100kHz-1.7GHz Software Defined Radio Set for HF/UHF/VHF including RTL-SDR, Assembled Ham It Up Upconverter, Balun, Adapters
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What is software-defined radio (SDR)?: The basics for critical communications users - Barrett Communications
fifisdr
Getting started with SDR# and an RTL SDR tuner - YouTube
Virtual Software Defined Radio | Hackaday
OpenWebRX web-based software defined radio | Homepage
Testing the RTL-SDR on Windows 10
Amazon.com: SDR Software Defined Radio Receiver, USB C 10KHz-2GHz Analog SDR Receiver, 0.5 ppm TCXO High Accuracy and 12Bits ADC (Not RTL-SDR) : Electronics
RTL-Software Defined Radio with Dipole Antenna Kit | Elektor