The Project Horus team regularly launches high-altitude balloons in Australia. Despite their desire to do so, however, they have not released a live video. So far. The Horus 55 broadcasts video back to the ground from over 100,000 feet use of the Raspberry Pi and some software-defined radio equipment. Be sure to check out their video below.
You may think this is easy, but there are many technical obstacles. First, the transmitter needs a little power, but the thin atmosphere creates cooling problems. It also required a really good receiving station, and the project wanted to transmit this video to the Internet, which they were able to make.
The balloon carried a Raspberry Pi Zero W for video capture and compression. The LimeSDR Mini provided a 70cm DVB-S transmission, along with a power amplifier to reach around 800mW. The power dissipation in the payload is about 6 watts and requires a special radiator system to operate. The payload is powered by eight lithium primary AA cells, which perform well at low temperatures.
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