Radiosonde Decoder

Track weather balloons via radiosonde telemetry on 400–406 MHz. Decodes position, altitude, temperature, humidity, and pressure.

Settings

Region / Frequency Band

Frequency Range (MHz)

–

Gain (dB, 0 = auto)

Status

Status: Standby

Balloons: 0

Last update: —

Antenna Guide

400 MHz meteorological band — stock SDR antenna may work for nearby launches

Simple Quarter-Wave

Element length: ~18.7 cm (quarter-wave at 400 MHz)
Material: Wire or copper rod
Orientation: Vertical
Placement: Outdoors, as high as possible with clear sky view

Tips

Range: 200+ km with LNA and good antenna placement
LNA: Recommended — mount near antenna for best results
Launches: Typically 2×/day at 00Z and 12Z from weather stations

Quick Reference

Frequency band	400–406 MHz
Quarter-wave length	18.7 cm
Common types	RS41, RS92, DFM, M10
Max altitude	~35 km (115,000 ft)
Flight duration	~90 min ascent