The WG2 long-range balloon flight is now over as far as being able to track it is concerned; it is quite likely still in the air somewhere over Russia, however (as of 27/6/14).
The flight performed much better than we expected for a first try, covering a known distance of 1500 miles, to finally go out of ground-station range over Ukraine about 31 hours after launch. During the flight the balloon passed through a total of 8 countries (some more than once).
The balloon’s telemetry signal was received across Europe by a network of volunteers (many of whom are amateur radio operators), and fed into the central Habitat system operated by the UK High Altitude Society (UKHAS). This enabled the flight to be seen in real-time through the spacenear.us site.
At the time contact was lost the balloon and the tracking electronics remained in good health, with the battery expected to last perhaps a further 8 to 10 hours. Long-range flight predictions from the last known point suggest that the balloon will, if it remains airborne, travel up into Russia and then continue East towards Siberia.
Today sees the first flight of my tiny ARM based GPS tracker. The balloon (a 36″ Qualatex foil) was launched from Wirral Grammar School for Girls with their Astronomy Club, who were responsible for the successful WGGS1 high-altitude launch last October.
This flight is a float attempt, and can be tracked at spacenear.us with the callsign WG2. Calculations suggest the battery (a single AAA) should be good until about Friday morning.
The tracker, shown in the picture (more here), has the connector piece removed once programmed. For scale, the board is the same length as the AAA that powers it. Wire antennas were used for both GPS and downlink, and these were just soldered straight to the board. Total mass is about 12 g including the battery. Technical details of the tracker follow…