The original manual fails to explain how to save a frequency without overwriting another.
To save a frequency to memory:
Recall a memory: Short press BAND/VM to toggle between VFO and Memory modes. Then use the encoder to scroll through your saved channels.
The ATS-20 (and the upgraded ATS-20+) is a portable full-band radio receiver based on the SI4732 chip. Official printed manuals are rarely included in the box, and users typically rely on community-shared PDFs or manuals for similar firmware (like the H-RADIO/ATS25 manual). Quick Start & Core Functions
Most ATS-20 units use a rotary encoder and a few tactile buttons for navigation. ats-20 radio manual
Power: Usually a physical toggle switch or a long-press on the encoder.
Band Selection: Press the Band button or the rotary encoder to cycle through pre-configured bands (FM, AM, MW, SW, and SSB).
Tuning: Turn the rotary knob. Pressing the knob often changes the Frequency Step (1kHz, 5kHz, 10kHz).
SSB/BFO: For Single Side Band (LSB/USB), use the BFO control to fine-tune the signal for clarity. The original manual fails to explain how to
Bandwidth: You can cycle through audio bandwidth filters (0.5, 1, 1.2, 2.2, 3, and 4kHz) to reduce noise. Key Specifications
Display: 0.96" OLED showing frequency, signal strength, and settings.
Battery: Internal 3.6V 800mAh lithium battery, rechargeable via USB.
Audio: Supports 3.5mm earphones or an 8-ohm/1.5W internal speaker. Recall a memory: Short press BAND/VM to toggle
Antenna: Uses an SMA interface; many users find the stock telescopic antenna is best for FM, while wire antennas help with shortwave (SW). Community & Troubleshooting
Because the firmware is often open-source (based on Arduino/ESP32), many users update their devices to gain new features like Bluetooth or better SDR capabilities.
Missing Manuals: If your unit arrived without instructions, the ATS20/ATS25 Facebook Community is the primary hub for downloading the latest English PDF manuals and firmware updates.
Firmware Flashing: Updating the firmware (e.g., using ESPFlashDownloadTool) can fix bugs or add "Pro" features like AIR band reception. im looking for ATS-20 Diagram
Because the ATS-20 radio manual is not in color, here is what those cryptic icons mean on your screen:
| Problem | Likely Cause | Solution | |---------|--------------|----------| | Won’t turn on | Dead battery / reversed polarity | Charge 4+ hrs; check 18650 orientation | | No FM reception | Antenna not connected (for SMA version) | Attach stub antenna or wire | | Poor shortwave | No external antenna | Add 15–30 ft wire outdoors | | Display flickers | Low battery or USB noise | Charge battery; use battery power | | Menus stuck | Accidental long press | Short press B or cycle power |