Software Defined Radio, Chapter 2: It Didn't Work
So now it's 2023 and I haven't revisited the project. Nothing I did 4 years ago would still apply anyway. CISC has since done this themselves. Their SDR is painted gold. Other than that, it's basically what I set out to do in 2017. Except it works, presumably, so good on them: https://www.cisc.at/product/rain-xplorer-spy/ In Sep2023, I am trying again with the Analog Devices ADL5920 . It's a $40 chip with bidirectional RF transmission line built in. It can separate forward from reverse power and measure both independently. That means, potentially, you could have a VNA in every RFID reader, telling you how good your antenna setup is and whether your antennas are receiving power from neighbors. Hopefully it won't be another 4 years before I post again.