Ats20 Firmware Here

I flashed IU3BJG v2.4 last week. The difference in the AM broadcast band is night and day – the stock firmware had images all over the place; the custom one actually uses the Si4732’s built-in DSP correctly.

Pro tip: If you flash new firmware, don't forget to recalibrate the Si5351 PLL. Your frequency will be off by ~500 Hz otherwise. Use a WWV signal at 10 MHz or 15 MHz to dial it in via the hidden calibration menu (usually Menu -> System -> Cal).

Open command prompt and run:

avrdude -c usbasp -p m328p -U flash:r:backup.hex

When you buy an ATS-20, it usually arrives with the manufacturer’s default firmware. While functional, early versions were notorious for issues such as:

For casual broadcast listening (AM), the stock firmware is adequate. But for amateur radio operators hunting Morse code (CW) or voice (SSB), an upgrade is often necessary. ats20 firmware

The ATS-20 and its upgraded sibling, the ATS-20X, have become ubiquitous in the world of amateur radio and shortwave listening. As incredibly affordable, portable HF (High Frequency) receivers, they offer a lot of functionality for the price. However, many users find the out-of-box experience lacking—quirky menus, limited frequency steps, or a user interface that feels unfinished.

This is where the world of ATS20 Firmware steps in, transforming a cheap gadget into a capable receiver. I flashed IU3BJG v2

One of the biggest complaints about the stock firmware is the lack of selectable filters. Modern custom firmware allows you to choose between 1.0 kHz, 2.2 kHz, 3.0 kHz, and 4.0 kHz bandwidths for AM and SSB, drastically reducing adjacent station interference.