This radiosonde is the most capable of the educational AnaSonde radiosonde family. It has seven analog channels available as well as one digital frequency counting channel. The sondes can be programmed by the user - this includes call sign, channel configuration, sampling interval, and data transmission speed. Calibration equations for each sensor can also be programmed by the user, or raw data can be transmitted as well with appropriate coefficient selection. Configuration can be accomplished using HyperTerminal or a similar terminal program, or using the associated software. Users need to provide or purchase a small serial cable to connect their PC to the sonde for programming.


The AnaSonde-3M is powered by a 9-volt battery or an external 5-volt DC power supply. The AnaSonde-3M can transmit data in two ways:

  • 70-cm amateur radio band, Morse code
  • Serial port, ASCII data

SondeWorks, our custom data acquisition software, works with CwGet to log and display Morse code data in real time. ASCII serial data is appropriate for use with Hyperterminal or another terminal program.

The AnaSonde-3M temperature format is in absolute degrees (Kelvin, or Rankine if anyone wants to use that scale). This eliminates the need to transmit + or - signs with the data, and thereby removes the need to edit the CwGet files when installing the AnaSonde software.

Datasheets and assembly documentation are available on our radiosonde resources page. Assembly presentations are available on our teacher resources page.

Operating the 3M

The AnaSonde-3M requires an amateur radio license. Our FAQ has important information about the legal issues surrounding transmitter operation. The typical receiver setup recommended by Anasphere is an amateur radio receiver paired with a directional antenna such as a Yagi. A complete receiver kit including a Yaesu VR-120D receiver, a Cushcraft A430-11S Yagi antenna, and the cables to connect them is available from Anasphere. The launch balloon and parachute are included in the AnaSonde kit.