Aim of this project was to send a baloon probe to measure air temperature in lower parts of Earth's atmosphere. Additionally, experimental data about bahaviour of analog and digital electronic devices in low temperatures has been collected.

Measured data was transmitted to the field ground station (formed by students equipped with beam antenna, transceiver and a notebook with proper software) by switching carrier wave in the Morse code manner.

24 balloon shells were made of matal foil and filled with helium. Electronic components were attached to fuell cell which act as power supply and heater for other components. Only measurement nodes were drawn out, as far as possible, from the heat source. Transmitter module worked in Industry, Scientific and Medical band, at frequency of 433,92MHz, with powers around 10mW, with quarter wave length Ground Plane antenna.

Balloon probe was sent at OZMA (which is polish acronym for Polish Amateur Astronomers Meeting)in Niemczyn village, 20 km from Bialystok city, at 17:04 13.08.2005. Radio contact was lost after 1h 02m of flight eastwards, when probe declined over horizon. Maximum altitude was 2.5 -2.6 km, where measured temperature was around 1-2 degree centigrade. During flight probe travelled more than 35 km from launch site.

Experiment bring many practical information, useful for future missions, like very strong correlation between wheather (humidity, showers) and probe bahaviour. Also, important issue is to provide proper extensibility of balloon shells to reach higher altitudes.