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diqezit / ats20_ats_ex

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Custom firmware for the popular and cheap ATS-20 and ATS-20+ receivers with SI473X. This firmware fixes the common hardware audio pop/click issue and adds an FM/AM/SSB/CW Favorites list, lightweight RDS support, Battery monitoring, Signal Bar, and seamless SSB tuning. Heavily optimized to fit the ATmega328P 32Kb limits. Based on Goshante ATS_EX

arduino atmega328p ham-radio amateur-radio ats ssb si4735 si4732 ats-20 ssb-project
  • Updated Mar 12, 2026
  • C++

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