Update 12/4/2025 (See original story, below.)

ChipSat Signals Received; Listeners Still Needed

Updating the story, ‘Space Sailors’ Seeking Download Help from Ham Radio Operators,” posted on December 2, 2025, Cornell University’s “ChipSat”-equipped light sail was successfully deployed on December 3 and several dozen telemetry signals from its ChipSat flight computers have been received and decoded. This is the first time that orbit-to-ground ChipSat data has been fully decoded, which Ph.D. candidate Joshua Umansky-Castro, KD2WTQ, calls “a huge milestone for the technology.”

Student researchers at Cornell still seek help from amateur radio operators equipped with satellite receive stations to continue monitoring for signal from the 100-milliwatt transmitters on 437.400 MHz, using the LoRa® digital protocol. It is estimated that the light sail will deorbit within 48 hours of deployment, due to the drag it creates in low-Earth orbit. Data is being collected on the TinyGS project webpage, which is also posting updates on progress.

Original story 12/2/2025

A group of students at Cornell University is seeking participation from radio amateurs who are equipped with satellite stations for help in listening for signals from a retroreflective laser sail that is scheduled to be deployed later this week. The sail is currently attached to a 1U CubeSat that was launched early Tuesday, December 2, 2025, from the International Space Station, but will separate and become its own free-flying spacecraft equipped with four tiny “ChipSat” flight computers that will transmit telemetry data back to Earth.

This is the first flight of their ChipSats, and it is this data that the students seek help detecting, according to Ph.D. candidate Joshua Umansky-Castro, who has an amateur radio license; call sign KD2WTQ. The light sail’s ChipSats will be transmitting data using the LoRa® digital protocol on 437.400 MHz. The sail, stowed within the CubeSat, is expected be released a couple of days after deployment — tentatively this Thursday, December 4 — and will likely function independently for no more than 48 hours due to the drag created by the sail.

Additional information, including LoRa parameters and links to a list of compatible receivers and the decoder file, may be found at alphacubesat.cornell.edu in the ChipSat Ground Station Guide (docx).

It is hoped that the ChipSat and light sail will become the trailblazer for future missions around the solar system, and one day to our closest stellar neighbor, Alpha Centauri.