A TX-only TNC (Terminal Node Controller) to generate the AFSK (Audio Frequency-Shift Keying) audio tones for APRS (Automatic Packet Reporting System) messages using a RP2040 microcontroller on a Raspberry Pi Pico board.
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RadioBerry V2.0 - Ham radio cape for Raspberry PI
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ESP32 LoRa APRS Modem
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Turn your Android phone into real VHF/UHF Walkie-Talkie (requires additional digital radio hardware/software modem)
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