(and its successor, the ) is a popular, budget-friendly DSP radio based on the Si4732 chip. While the stock firmware (typically version 1.1.5) is functional, the community has developed custom alternatives that unlock significant features, turning the device from a basic receiver into a capable tool for amateur radio enthusiasts. Why Upgrade Your ATS-20 Firmware?
Updating the ATS20 firmware is a crucial process that ensures the device remains functional and secure. Here are the general steps involved in updating the firmware: ats20 firmware
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). (and its successor, the ) is a popular,
Connect the radio to your PC via a USB cable (ensure your radio has a USB-to-serial chip like the CH340). The Software: Use the Arduino IDE or XLoader . Firmware versions : Different versions of the ATS20
Many custom builds optimize the 0.96-inch OLED screen to show signal strength (S-meters), battery levels, and bandwidth settings more clearly.
: This is widely considered the standard "advanced" firmware for the original ATS-20/20+. The ATS_EX Manual (PDF)