via the ARRL: INSPIRE-2 Ground Controllers Turn to Amateur Radio Rescue Stalled Satellite

Amateur Radio came to the rescue of the INSPIRE-2 CubeSat, built by the University of Sydney in collaboration with the Australian National University, and the University of New South Wales. According to Wireless Institute of Australia (WIA), the CubeSat is designed to “explore the lower thermosphere, for re-entry research and in-orbit demonstration of technologies and miniaturized sensors” and is part of the QB-50 constellation of research CubeSats. Its operational frequency was coordinated by IARU to be in the satellite segment of the 70-centimeter Amateur Radio band.

After its deployment from the International Space Station (ISS) in late May, INSPIRE-2 showed no signs of life. The engineering group on the ground tested various scenarios on the INSPIRE-2 engineering model, concluding that the spacecraft’s battery had depleted due to the CubeSat’s extended stay on board the ISS prior to orbit. The ground controllers theorized that the satellite was trapped in an endless loop, but still listening while trying to deploy its antenna, making reception of signals from Earth difficult.

The ground team devised a set of commands that, if received, would instruct the satellite to wait until its battery was charged before attempting to deploy its antenna. UNSW and ANU ground stations transmitted the recovery command without success, however, eventually deciding that more power was needed to overcome the lack of receiver sensitivity caused by the still-stowed antenna.

via American Radio Relay League | Ham Radio Association and Resources