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.
cats radio gps amateur-radio wspr gps-tracker aprs balloon webusb si5351 horus radiosonde high-altitude-balloon rs41 4fsk dfm-17 si4032 si4063
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Updated
Jul 8, 2026 - C