NNESTS: making a satellite pass a classroom experiment

NNESTS connects school learning with satellite radio. PhilSA’s concept includes teacher support, learning materials and amateur-radio equipment for selected schools. Electromagnetic waves link the activity to science lessons: a radio signal transports information without a cable between the satellite and antenna. The educational network is ground infrastructure and a teaching effort, not a new constellation of spacecraft.

At a Davao school on October 7, 2022, participants demonstrated contacts through Diwata-2 during a pass lasting about twelve minutes. Operators reached other locations in the Philippines and Indonesia. The spacecraft’s archive card uses its amateur-radio designation, Phillipines-OSCAR-101. That historical demonstration is evidence of a particular successful contact, not a guarantee that the same pass time or connection remains available every day.

A low-orbit satellite moves relative to a school on the ground. During a useful pass, the ground station must have a suitable view and compatible equipment. A tracking prediction tells operators when and where to look, while the antenna’s orientation helps it receive or transmit in the appropriate direction. The photograph shows people and antennas performing the ground part of that connection.

Imagine a classroom exercise with a predicted contact from 14:00 until 14:12. If equipment preparation takes until 14:05, only seven minutes of that assumed window remain. The arithmetic does not guarantee reception throughout those minutes: obstacles, interference or spacecraft operating conditions may shorten usable contact. Planning should leave time to configure and check equipment before the predicted opportunity begins.

A limited radio opportunity

The second photograph shows SwissCube’s EPFL ground-station antennas in Switzerland. It is a comparison of ground infrastructure, not a Philippine NNESTS installation. Both photographs illustrate that using a spacecraft requires equipment and activity on Earth. Their different scales do not establish which station is better for a particular task; frequency, pointing, receiver performance and operating needs determine suitability.

For a learning exercise, record the predicted pass, actual contact times, equipment configuration and whether a message was understood. A missed contact can still teach something if the team documents what happened and tests possible explanations. Radio communication is also a shared resource: practical activities belong with trained supervision and appropriate operating authorization. The educational goal is to connect a physical model with observations, then explain both successful results and remaining uncertainty.