Dave VE3KCL balloon S-4 launch
On 21-Aug-2015 Dave VE3KCL launched a balloon (in fact two hydrogen-filled foil "party" balloons tied together) carrying a 35g payload. The balloon is currently traveling North East a very nice speed! It is cruising at around 8,300m.
The electronics payload Dave built has a GPS, battery, solar panels, QRP Labs Si5351A Synthesiser module, and Arduino Nano (for low weight) that runs the QRP Labs Ultimate3S QRSS/WSPR transmitter firmware, but a slightly modified version.
The balloon uses WSPR on 30m (20mW power) but encodes telemetry data onto the WSPR protocol, in two sequential messages. The additional data carries 5th and 6th Maidenhead locator characters, altitude, speed, battery, temperature, GPS status and satellite status. The balloon is also sending JT9 plain text, and CW to the reverse beacon entwork. The WSPR messages logged to the WSPRnet database are decoded automatically and plotted on the map in realtime at http://qrp-labs.com/ultimate3/ve3kcl-balloons/ve3kcl-s4 .
There are more details and photos on http://qrp-labs.com/ultimate3/ve3kcl-balloons/ve3kcl-s4