LoRaWAN at 100,000 feet & 10mW with High Altitude Ballooning, Tony Brookes (OSHCamp 2018)
Channel: AB Open
Date: 2021-01-17

High-altitude balloons are manned or unmanned balloons, usually filled with helium, that are released into the stratosphere and generally attaining between 18,000 to 37,000 metres (59,000 to 121,000 ft; 11 to 23 mi). In 2002, a balloon named BU60-1 attained 53.0 km (32.9 mi; 173,900 ft).

The advent of cheap open source electronics & suitable GPS chips has allowed hobbyists worldwide to build fly & (usually) recover these balloons since the mid 2000’s with modest budgets compared to professional weather balloons. Indeed, the Raspberry Pi Foundation ran a few Skycademy events aimed at helping school teachers. There is a wealth of information available from the United Kingdom High Altitude Society (UKHAS), their website HabHUB.org and Dave Ackerman’s website.

Ofcom limit the power of any airborne transmitter to 10mW, which whilst tiny isn’t a practical problem since the line of sight is usually superb. The community stated using RTTY initially but latterly has begun to use LoRaWAN to transmit the telemetry and some of the pictures taken during a typical 2 to 3 hour flight. The Civil Aviation Authority will grant permission for such flight via their system, NOTAMs. It’s normal to be asked to contact air traffic control before launch to make sure commercial aviation traffic isn’t hindered.

Tony Brookes is a member of the Derby Makers who is leading a project to launch such a balloon (or more if funding permits) over the summer. Derby Makers are now resident in the Radio Communications Museum of Great Britain in Derby following their tenure in the Derby Silk Mill museum which is now undergoing HLF funded refurbishment.