The culminating Tau Wireless challenge. No recipe. No step-by-step flowgraph. Just unknown signals and the radio-engineering intuition you've built across the core program.
CTS asks you to decide what to measure, which tools to use and which hypotheses to test. Challenges can progress from signal characterization through modulation and packet recovery to a final OFDM challenge.
You don't prove that you understand radios by choosing an answer from a list. You prove it by figuring one out. Successful completion can be recognized with a Tau Wireless completion credential and an earned take-home SDR.