The Cypress FX3 USB device is an ARM processor, but it is only streaming data, not processing it. You can find the slightly modified firmware, a driver for using PC software, and schematics and board layouts on GitHub.
We aren’t quite sure where the term breadboard factors into the name since there is a PC board involved and no solderless breadboard. The basic receiver covers 0 to 30 MHz, and a mixer downconverts higher frequencies to that range.
There’s enough information that you should be able to duplicate this project, although you’d need to do a little analysis of the material. This isn’t a step-by-step build tutorial. However, this should be much more sophisticated than the usual RTL-SDR dongle. This is more on par with the SDRPlay, although it has a higher maximum frequency and some additional hardware filtering. It also is a 12-bit digitizer instead of the RF103’s 16-bit one which is a point in the RF103’s favor.
Filed under: wireless hacks