A metallic panel half buried in a rice field outside Karanganyar, Central Java, has been identified as part of an experimental communications satellite whose transmitter was operating at far higher power and across forbidden frequencies than regulators permit. The fragment was handed to Bandung Institute of Technology on 21 September, and tests released on 23 September show emissions that coincide with unexplained outages at three coastal radars and a string of wildlife-tracking failures across southern Java.
The fragment, a composite panel 28 by 18 centimetres with a serial plate, was found on the roadside by Salimah Pradipta, a 42‑year‑old primary schoolteacher, when she walked home after a heavy rain. Laboratory analysis showed an integrated phased‑array module and a small but potent radio transmitter tuned to the 1.25–1.45 GHz band — a frequency slice that includes the hydrogen 21‑centimetre line used by radio astronomers and is protected for scientific use.
What the tests showed
Dr Hendra Kusuma, head of electromagnetic research at Bandung Institute, said the board’s firmware contained a commercial vendor signature and software routines designed to steer a beam across wide angles. “The transmitter measured on the fragment exceeded permitted field strength by a factor of about 15, and the emissions bled into 1.42 GHz — the hydrogen line used for galaxy surveys,” he told this newspaper. Traces on the serial plate matched a batch sold to a private orbital startup, according to a forensic read of the chip.
This transmitter was built to blanket a continent, not serve a rice field.
Dr Hendra Kusuma, electromagnetic researcher
Local systems hit
Fishermen off Cilacap reported glitches in automatic identification signals (AIS) at dawn on 19–22 September, and meteorological officials say coastal pulse‑Doppler radars near Semarang registered spurious returns that interrupted a 20‑hour window of sea‑state monitoring last week. Cintija Hermanas‑Martinas, who coordinates an NGO tracking Javan hawk‑eagles, said 14 telemetry tags on endangered raptors stopped reporting on 20 September and two collars remain offline. “We lost fixes during two crucial days of migration monitoring; some birds were untrackable for 36 hours,” she said.
A private constellation in the spotlight
The component bears a trademark registered to LuxaOrbital, a smallsat operator owned by entrepreneur Rendall Gerbeau. LuxaOrbital has been among a rush of start‑ups offering high‑throughput downlinks and experimental wide‑area beams. Gerbeau issued a short video statement to the press saying the company is cooperating and that the hardware came from a subcontractor in the Philippines; he denied any deliberate breach of protected bands and said operations had been paused while the company audits its fleet.
Albert Major, a spokesman at the Ministry of Communication and Informatics (Kominfo), confirmed the ministry has opened an administrative case and ordered LuxaOrbital to ground two of its trial satellites that pass over Indonesia’s longitude. “We have data linking signal footprints to the period of outages. The regulator will press for international coordination if the company cannot show compliance within 72 hours,” he said.
Wider consequences and next steps
Experts say the incident is a concrete example of how a rapid increase in experimental smallsats can have direct effects on ground infrastructure and scientific instruments. Tamara Geiger, an amateur radio operator in Yogyakarta, said local amateur bands were filled with intermittent carrier noise this month: “It sounded like someone had tuned a powerful jammer above our neighbourhood — it knocked out whole swathes of the dial.” Groups representing radio astronomers in South East Asia have asked Indonesia to bring the case to the International Telecommunication Union next week.
Dr Kusuma urged an immediate technical moratorium on wide‑area phased‑array payloads until international rules and identification protocols are tightened. Kominfo has scheduled a meeting with LuxaOrbital and regional regulators for 25 September; conservationists are asking for a priority field survey to check the status of the missing telemetry tags. Salimah Pradipta, who says she kept the panel wrapped in a sarong on her kitchen table until she could reach a lab, called the discovery “a small thing that started a very big problem.”
