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Volumes

1. Vol 1 How a Signal Carries Information — Vol 1: There Is Only the Sine Wave Radio has exactly one thing to work with, and it is featureless on purpose. Everything in this sub-project is a different answer to the same question: what do you do to a bare sine wave to make it mean something?
2. Vol 2 How a Signal Carries Information — Vol 2: What a Mode Actually Is Modulation is only a third of the answer. A mode is information plus an air link plus a protocol — and in January 2024 the FCC quietly changed the rules about what American hams are allowed to build out of those parts.