Reverse frequency lookup for SDR: click a signal, learn what it is. FCC and ITU allocations (0 Hz–275 GHz) plus curated US and European channel plans — as SQLite, JSON, and a zero-dependency C99/Swift reader.
radio spectrum swift sqlite scanner c99 fcc ham-radio open-data dataset amateur-radio sdr rtl-sdr rf itu cept signal-identification frequency-allocation
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Updated
Aug 21, 2026 - Python