A compact hardware device for transmitting WSPR messages based on the SI5351 clock generator, using GPS for transmission timing synchronization and automatic QTH locator calculation.
radio open-source esp32 gps pcb open-hardware amateur-radio wspr atmega328 si5351 wspr-beacon wsprnet esp32-c3 wspr-beacons
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Updated
Apr 2, 2026 - C++