Amazon.com: SDR Radio Receiver, HF Transceiver, Stable Output HF QRP SDR Radio Receiver SSB CW with Microphone for Signal Reception, Shortwave Transceiver for DIY Radio Communication (US 110-240V) : Electronics
Amazon.com: SDR Radio Receiver Transmitter, HF Built in Mic Shortwave Aluminum Alloy 100‑240V SDR Transmitter DSP for DIY (US Plug) : Electronics
Amazon.com: SDR Radio Transmitter, 8 Band HF QRP SDR Transceiver for Reception(#1) : Electronics
Software Defined Radio Transceiver - Make:
PA3FWM's software defined radio page
DIY SDR DSP Radio with Raspberry Pi and RTLSDR | Hackaday.io
DIY RTL SDR: Building a 100kHz-1.7GHz Software Defined Radio - OE6FTE amateur radio blog
Building a Software Defined Radio from Scratch
Building a Quad RTL-SDR Receiver for Radio Astronomy
SBITX: Hackable HF SDR For The Raspberry Pi | Hackaday
SDR with arduino - Project Guidance - Arduino Forum
PA3FWM's software defined radio page
Software Defined Radio with Arduino Nano | Radio Club PZK LAB-EL HF5L
Homebrew software defined radio - a demonstration - YouTube