rs41

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.

• Updated Jul 8, 2026
• C

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.

• Updated Jul 24, 2026
• HTML

Reverse Engineering of the Vaisala RS41 Radiosondes Data Frame Format

• Updated May 30, 2022

RS41 and DFM09 radiosonde projects

• Updated Aug 22, 2025
• C++

dxlAPRS extension for uploading radiosonde telemetry to SondeHub

• Updated Nov 13, 2024
• Python

Radiosonde decoder, monitoring, scan and decoder status

• Updated Sep 5, 2026
• C

ESP-IDF firmware that turns a LILYGO T3 V1.6 into a portable weather-balloon receiver — BLE companion to the BalloonHunter app.

• Updated Aug 31, 2026
• C

dxlAPRS Encrypted Sonde Telegram Notifier

• Updated Mar 21, 2023
• Python

Linux-based RS41 radiosonde tracking, decoding and SondeHub upload application with graphical and terminal interfaces, as well as script-based launch options. / Linuxos RS41 rádiószonda-követő, dekódoló és SondeHub feltöltő alkalmazás grafikus és terminálos felülettel valamint script indítási lehetőségekkel.

• Updated Aug 2, 2026
• Perl

Handheld RS41 radiosonde recovery receiver firmware for the LilyGO T-Deck Plus with SX1262, GPS navigation, SD logging, frequency scanning, and read-only SondeHub predictions.

• Updated Aug 27, 2026
• C