si4032

Easy-to-use custom firmware for Vaisala RS41 and Graw DFM-17 radiosondes with support for amateur radio use. Ideal for tracking high-altitude balloons. Configure and flash the firmware using a web browser (WebUSB). Supported modes include APRS, Horus 4FSK mode, CATS, morse code (CW) and additional digital modes like WSPR and FT8 via Si5351.

Versatile, feature-rich firmware for ALL revisions of Vaisala RS41 radiosondes, supporting factory-calibrated sensors (silver boom and pressure board), excellent GPS performance, Horus/APRS/Morse/RTTY/Pip/Fox radio modes and more! Project usage is straightforward, with web flasher and guided configurator.