This is likely local electronic interference. Turn off nearby plasma TVs, computer monitors, or cheap USB wall adapters. If you are charging the radio while listening, unplug the charging cable.
Turn off the radio. Remove the battery. Look at the main chip through the battery compartment. It should say "Si4732-A10."
The ATS-20 radio is a portable, handheld transceiver designed for amateur radio operators. It operates on the shortwave (HF) band, allowing users to communicate with others worldwide. The device features a compact design, weighing in at just 260 grams, making it easy to carry on outdoor adventures or use in a variety of environments. ats-20 radio manual
and its upgraded sibling, the , are compact, budget-friendly DSP receivers based on the Si4732 chip and Arduino Nano architecture
Choosing a narrower filter helps to reject adjacent channel interference, especially on the crowded shortwave bands. This is likely local electronic interference
The ATS-20 (often updated as the ATS-20+) is one of the most popular, budget-friendly portable Shortwave (SW) and All-Band radio receivers on the market today. Utilizing the powerful SI4732 microchip and an Arduino-based controller, this compact device opens up the world of amateur radio, commercial broadcasts, and aviation signals to hobbyists.
The original manual is notoriously bad at explaining battery installation. Turn off the radio
The device features an OLED display and a set of eight buttons, typically running firmware version 3.0.7g by PU2CLR.
In SSB mode, press the encoder knob to activate BFO adjustment for fine-tuning voice signals.