The new ready to use light-weight Radiosonde


Radiosonde DFM-17

  • Highly stable transmitter
  • Heated humidity sensor
  • Multi GNSS radiosonde (GPS, GLONASS, BEIDOU)
  • Operating status indication via status LEDs
  • Optional XDATA interface
  • Optional barometric pressure sensor
  • Easy ground check via Near Field Communication (NFC)


Our new little one – ready for ascent

The state-of-the-art DFM-17 is our latest Radiosonde and currently one of the lightest and smallest radiosondes on the market. It was designed for precise and reliable measurement of temperature, humidity, air pressure, wind direction and wind speed. It is easy to use, simplifies the preparation before the ascent and thus, making it the ideal instrument for daily sounding.

Technical data


63 g, ready to start


90 x 67 x 44 mm

Power supply

2 x Lithium CR123A, replaceable

Runtime integrated battery pack

> 240 min

Wind finding



One full data set per second


< 12 kHz

Frequency range

400 - 405.99 MHz



Output power telemetry

< 100 mW

Error correction telemetry

Code-spreading, interleaving

Temperature resolution

0.01 °C (internal)

Temperature uncertainty

< 0.25 °C

Humidity resolution

0.1 %rH

Humidity uncertainty

< 3 %rH

Pressure uncertainty

Uncertainty > 100hPa< 1 hPa
Uncertainty 100 - 10hPa< 0.2 hPa
Uncertainty < 10hPa< 0.04 hPa

Geopotential height uncertainty

< 8 gpm

Wind speed uncertainty

< 0.1 m/s

The first few metres of ascent pose the most risk for the radiosonde in the event of strong winds. Secure your ascent with one of our Unwinders. For more information click here.

Balloon Filling Units
We offer balloon filling units in different designs for filling balloons with helium or hydrogen and for varied balloon sizes. For more information click here.

Our high quality balloons are available in different sizes and ensure that your radiosonde reaches the desired height. For more information ask our sales team.