Peter's electric trick and electronic blog

The ATS MiniRadio is a remarkably compact and versatile shortwave receiver platform with a high-impedance antenna input, a color display, and a simple yet effective rotary-encoder control concept.

The ATS MiniRadio based on the SI4732 emerged as a pure open-source hardware and software project from community development and has become one of the most exciting open-source radio projects in recent years.

Some antenna ideas are born from a mix of curiosity, good weather, and the urge to experiment.

For a short time in Spring 2026, there appeared a remarkable somehow different SI4732 based MiniRadio version in the well known shops — probably an unauthorized prototype that had slipped out of a Chinese factory — soon nicknamed Mr Orange.

There are many discussions about how to improve the shortwave reception of the ATS MiniRadio, which usually comes with only a short telescopic whip antenna.

All versions of the SI4732-based MiniRadios produce a peculiar sound effect when a signal is received in SSB mode.

The following post originally referred to the AMNVOLT MiniRadio V4, which was available until November 2025.

The Si4732 based ATS Mini Radio is a fantastic affordable receiver for those simply wanting to listen to the waves, … or even for more technical radio enthusiasts who want to transform it into a versatile tool.

The affordable, open‑source ATS Mini Radio inspires many shortwave enthusiasts to return to the airwaves.

Decoding shortwave weather broadcasts in RTTY, thanks to a Si4732 Mini Radio and just one added wire.