If your ATS20 isn't working, the stock manual suggests "check power." Here is the real fix list.
In SSB mode, press and rotate to adjust the BFO (fine-tune voice). Operational Tips ATS_EX Firmware for ATS-20 DSP Receiver - GitHub ats20 radio manual better
Thank you for purchasing the ATS-20. This compact, software-defined radio (SDR) receiver is based on the Silicon Labs Si4732 DSP chip. It offers wide frequency coverage, multiple modulation modes, and high sensitivity in a portable form factor. If your ATS20 isn't working, the stock manual
Important: After changing Step, AGC, or Bandwidth, select to keep them after power cycle. This compact, software-defined radio (SDR) receiver is based
: Press the BW button to toggle filters (0.5, 1.0, 1.2, 2.2, 3.0, or 4.0 kHz) to reduce interference in crowded bands. AGC Control Automatic Gain Control to maintain consistent audio levels. EEPROM Reset
The stock manual says "Connect antenna." That is it. This is a crime.