Sub-GHz 868/433 MHz & LoRa Concrete Bunker Link-Budget Solver

Deterministic Sub-GHz reinforced-concrete rebar aperture diffraction + LoRa chirp spread-spectrum sensitivity (-137 dBm at SF12) link budget engine (.pdf, .json, .csv) built for Ajax Systems, YoLink, Shelly, Meshtastic — zero-upload ephemeral Wasm RAM execution.

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