Ats20 Firmware — [portable]

This allows for better SSB demodulation, reducing "chipmunk voices" and making voice transmissions clear.

Stock firmware often delivers distorted SSB audio with a noticeable "pilot tone" (a high-pitched whine). Community firmware like ATS20-Enhanced adds proper BFO (Beat Frequency Oscillator) calibration, making ham radio conversations intelligible. ats20 firmware

Download the .ino or .hex file from a reputable source like GitHub (search for "SI4735-Arduino-Library-master" by PU2CLR). This allows for better SSB demodulation, reducing "chipmunk