POWER ON: Long-press VF SELECT MODE: Long-press Filter (AM > LSB > USB) SAVE MEMORY: VFO mode > Long-press VM > Long-press VF RECALL MEMORY: Short-press VM > Rotate Encoder SSB TUNING: 10 Hz steps (press encoder to change step speed) RESET DEVICE: Pinhole reset button next to USB port (paperclip) HIDDEN MENU: Power off > Hold VOL + Power While the factory ATS-20 radio manual may leave you frustrated, this guide provides everything you need to enjoy one of the most fun, portable shortwave and SSB receivers on the market. The ATS-20 is not perfect—the UI has a learning curve, and the stock firmware has quirks—but with these instructions, you can unlock its full potential as a travel-friendly ham radio companion, an aviation band scanner, or a bedside world receiver.
| 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) | ats-20 radio manual
On SSB modes, long-press the Filter/Mode button to switch between Upper Sideband (USB) and Lower Sideband (LSB). Chapter 3: Step-by-Step First-Time Setup (Battery & Antenna) The original manual is notoriously bad at explaining battery installation. POWER ON: Long-press VF SELECT MODE: Long-press Filter
Community forums like Radioreference.com and the SI4735 subreddit are excellent resources for advanced tweaks beyond any manual. Search terms used: ATS-20 radio manual, ATS-20 plus manual, Si4732 radio instructions, ATS-20 Pro SSB tuning, ATS-20 hidden menu, ATS-20 firmware update. Chapter 3: Step-by-Step First-Time Setup (Battery & Antenna)