Australian students build sub-$500 radio telescopes for rural schools

A team of students from Narrabundah College in the ACT, working through the Science Mentors ACT program, has launched the Project for Accessible Radio Telescopes (PART) to design and distribute low-cost radio telescopes to rural Australian schools. Each unit targets a build cost under $500 and pairs a commercial weather satellite dish and conductive plastic base with low-noise amplifiers, bandpass filters, an RTL-SDR software-defined radio, and a motor system. The telescopes are tuned to capture the 21 cm hydrogen line, the frequency band that makes galactic hydrogen observable.

The group plans to manufacture 25 telescopes and hand them out free to remote high schools and colleges, alongside open documentation covering installation, RTL-SDR data capture, and signal processing. The motivating gap is concrete: a 2023 Department of Education report found 15-year-olds in remote Australia trail their metropolitan peers in STEM by roughly 1.5 years, and few rural schools can afford working observational equipment.

Beyond the educational mission, the project is a useful demonstration of how cheap SDR hardware plus open software has pushed real radio astronomy — not just optical stargazing — into a price range accessible to secondary schools.