Custom firmware for Vaisala RS41 and Graw DFM-17 radiosondes with support for amateur radio use. Ideal for tracking high-altitude balloons. Supported modes include APRS, Horus 4FSK mode, CATS, morse code (CW) and additional digital modes like WSPR and FT8 via Si5351.

Versatile, feature-rich and user-friendly custom firmware for ALL revisions of Vaisala RS41 radiosondes

4FSK HorusBinary V1 and V2 compatible HAB tracker for SX127x and Arduino Pro mini

Arduino sketch for a High Altitude Balloon tracker for ESP32 and sx127x or RFM9x. Supports LoRa, LoRa-APRS, RTTY, Horus V1 4FSK, Horus V2 4FSK. Supports LoRa uplink.