Is your radio built with an or an ESP32 board inside?
Press and hold the POWER button until the OLED screen lights up. ats-20 radio manual
Press the button until you see LSB (Lower Sideband) or USB (Upper Sideband) on the screen. Is your radio built with an or an ESP32 board inside
Connect a simple spool of insulated speaker wire (20 to 50 feet) to the center pin of the BNC connector. String this wire outside, as high and clear of structures as possible. This will massively boost shortwave reception. ats-20 radio manual