+1 for the rad1o/hackrf. Most of the other SDRs people are recommending here are only receivers, so they can't transmit. When I was at CCC camp I made node.js

+1 for the rad1o/hackrf. Most of the other SDRs people are recommending here are only receivers, so they can't transmit. When I was at CCC camp I made node.js bindings for the hackrf, so it's pretty easy to work with: https://github.com/mappum/node-hackrf https://github.com/mappum/node-hackrf, https://github.com/mappum/hackrf-stream https://github.com/mappum/hackrf-stream