| Button | Short Press | Long Press (2 sec) | | :--- | :--- | :--- | | | Turn on/off (standby) | Enter VFO (Variable Frequency Oscillator) mode | | BAND/VM | Change band (AM/FM/SW/LW) | Enter VM (Variable Memory) / Memory recall | | STEP/AGC | Change tuning step (1kHz, 5kHz, 10kHz) | Toggle AGC (Automatic Gain Control) on/off | | Filter/Mode | Change bandwidth (e.g., 6kHz, 4kHz, 2.2kHz) | Switch receive mode (AM/LSB/USB) | | Volume/Squelch | Adjust volume (0-63) | Adjust squelch level | | Encoder (Knob) | Tune frequency | Fast tune (10x step) |
, which allows users to completely rewrite how the radio functions. Key Functions and Controls The radio features a minimalist layout centered around a 0.96-inch OLED display and several multi-function buttons: TUNE/BFO/ATS Knob ats-20 radio manual
Because these devices are manufactured by various Chinese OEM brands (like C.Crane, Hanfong, or unbranded), official documentation is often sparse. This guide covers the hardware architecture, menu navigation, hidden features, and troubleshooting based on the standard SI4735/DSP chipset architecture used in these units. | Button | Short Press | Long Press
Note: This manual is community-sourced. No official manual exists from the manufacturer. For firmware updates (if applicable), check radioreference.com or GitHub for “ATS-20 Si4732.” Note: This manual is community-sourced
: A popular "advanced" firmware that adds a cleaner interface, better battery monitoring, and removes "chuffing" (the brief audio mute when tuning). How to Flash : Most units connect to a PC via . You can use tools like Arduino IDE to upload new Quick Troubleshooting EEPROM Reset
