A shortwave SDR receiver using a Tayloe Quadrature Detector. Costs less than $15 and can be built with few parts on a breadboard or a PCB.
Get your PCB from PCBWay: https://www.pcbway.com/?from=Doctor%20Volt
Sources, schematics etc: https://github.com/michalin/easysdr
Paper on Tayloe Quadrature Mixer: https://www.norcalqrp.org/files/Tayloe_mixer_x3a.pdf
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00:00 – Introduction
00:20 – What is software defined radio, how does it work?
01:20 – Mirror frequency problem
01:53 – Quadrature demodulation
03:12 – The Tayloe Quadrature Detector
06:18 – Quisk SDR software
08:01 – First tests
09:25 – Building on PCB
10:34 – Clock generator Si5351
11:32 – Chasing for waves