: In USB or LSB mode, press the tuning knob to activate BFO. This allows for ultra-fine adjustments (often in 10Hz or 20Hz steps) to clarify "Donald Duck" voices in SSB transmissions. AGC (Auto Gain Control)
Rotate the to scroll through the frequencies.
A chill ran down his spine. It was 1:58 AM. He dialed in the frequency. At exactly 02:00, the static parted. A woman’s voice, eerily flat and pristine, began to recite numbers in German. “Acht… zwei… neun… null… vier…” Elias leaned closer, mesmerized. The manual hadn’t told him what to do when she finished. He found out. After the last number, the voice stopped. Then, a single, clear whisper came through the speaker, as if she was standing right behind him: “Why are you listening?”
Press the button to toggle between standard AM and SSB. Select USB (Upper Sideband) for frequencies above 10 MHz. Select LSB (Lower Sideband) for frequencies below 10 MHz. Fine Tuning (BFO) ats-20 radio manual
For fine-tuning a weak or crowded station, choose a smaller step size (e.g., 1 kHz or 500 Hz).
Briefly press the rotary encoder knob once (or press the dedicated "VOL" button if your variant features one). The display will highlight the volume indicator.
The ATS-20 radio manual is not just a reference guide; it's also a valuable resource that can help you improve your skills as a ham radio operator. Here are some tips on how to use the manual to get the most out of your radio: : In USB or LSB mode, press the tuning knob to activate BFO
Use a small Phillips screwdriver. Do not strip the tiny screws. Step 2 – Battery orientation: Insert an unprotected flat-top 18650 lithium-ion battery. Positive (+) terminal goes towards the top of the radio (near the SMA antenna connector). Negative goes towards the bottom. Step 3 – Power on: Long press the Power/VF button for 1.5 seconds. If the screen flashes and dies, your battery is low or inserted backward. Step 4 – Antenna: The SMA connector is fragile. Do not over-tighten. For SW/HF, a 5-7 meter long wire is best. For FM, use the included telescopic whip.
For charging the internal battery and updating firmware.
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 A chill ran down his spine
When in SSB mode, the BFO allows you to fine-tune the pitch of the voice to make it intelligible. Rotate the encoder until the "Donald Duck" sound turns into a clear human voice. 6. Menu Settings
By accessing the internal menu (usually a long press of the encoder), you can: Save battery by dimming the OLED screen. Scan: Automatically search for the next strongest station. Mute: Quickly silence the audio. Troubleshooting Tips
The ATS-20 is highly capable, but its performance depends heavily on its antenna environment.
Warning: This voids any warranty and requires moderate technical skill.
Modern homes are filled with Radio Frequency Interference (RFI) from Wi-Fi routers, LED bulbs, and laptop chargers. For the best DXing (long-distance listening) experience, take your ATS-20 outdoors to a park, backyard, or open field away from power lines. 6. Troubleshooting Common Issues