About 170 Starshield satellites built by SpaceX for the US government’s National Reconnaissance Office (NRO) have been sending signals in the wrong direction, a satellite researcher found.

The SpaceX-built spy satellites are helping the NRO greatly expand its satellite surveillance capabilities, but the purpose of these signals is unknown. The signals are sent from space to Earth in a frequency band that’s allocated internationally for Earth-to-space and space-to-space transmissions.

There have been no public complaints of interference caused by the surprising Starshield emissions. But the researcher who found them says they highlight a troubling lack of transparency in how the US government manages the use of spectrum and a failure to coordinate spectrum usage with other countries.

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