Type-C or Mini USB port to charge the internal 3.7V lithium battery.

Rule of thumb: Use LSB for bands below 10 MHz (like 40m and 80m). Use USB for bands above 10 MHz (like 20m and 15m). Set your size to 1kHz or finer.

| Control | Function | |---------|----------| | | Tune frequency (clockwise = up, anticlockwise = down) | | Push‑button on encoder | Often used to switch between coarse and fine tuning steps, or to toggle BFO when in SSB mode | | BAND+ / BAND− | Cycle through the pre‑configured frequency bands | | VOL+ / VOL− | Adjust audio volume | | On/Off button | Long press to power on/off; short press may mute the audio |

Built-in 8-ohm 1W speaker; 3.5mm stereo headphone output. Battery: Built-in 3.7V / 1200mAh lithium battery. Antenna Port: BNC Female (50-ohm impedance). Frequency Range Coverage The ATS-20 spans a massive chunk of the radio spectrum:

I have an ATS-20 and I cannot get it to enter FM Mode.I ... - Facebook

The receiver can still be operated while charging (though the battery status may be inaccurate during that time).

Do you have the or the updated ATS-20+ version?

If your unit is running custom firmware (like the Goshante ATS-20 Exa ), you may see these settings in the menu:

| Menu Item | Function | |-----------|----------| | | Tuning step (1/5/9/10 kHz for MW; 1/5 kHz for SW) | | FM STEP | FM step (50/100 kHz) | | FM DE | De-emphasis (50 µs for Europe, 75 µs for US) | | BEEP | Keypress beep on/off | | LCD BACKLIGHT | Backlight timeout (1–30 seconds / always on) | | BATTERY TYPE | Li-ion / NiMH (affects voltage display) |

Short press to cycle through modes: FM, AM, USB, LSB, CW, USB, LSB .

This guide is based on popular community-driven firmware ( ATS_EX ) and general SI4732 operation. For official updates, always check the source where you purchased your receiver.

3.5mm headphone jack and built-in 8-ohm 1W speaker Antenna Interface: BNC female (50-ohm impedance) Power Source: 3.7V / 1200mAh internal Li-ion battery Charging Port: Type-C USB (5V charging input) 2. Interface and Controls Layout

Here’s a short, useful story that highlights the value of the ATS-20 radio manual in a real-world scenario.