From the front lines of the Cold War to the trenches of Ukraine, archival photos tell the story of Radio Free Europe, which ...

Nowadays, LoRa radio frequency fingerprinting has gained widespread attention due to its lightweight nature and difficulty in being forged. The existing fingerprint extraction methods are mainly ...

This paper presents a stable fiber-based radio frequency (RF) transmission system and investigates the effect of transmission frequency on the system’s frequency stability. By changing the frequency ...

What happens when a relic of the early Space Age unexpectedly outshines the cosmos, even for a fleeting instant? In June 2024 ...

Astronomers studying a distant galaxy cluster stumbled upon ancient radio signals that might hold clues to the formation of ...

A communications satellite out of commission since 1965 is chirping at the Earth in radio frequencies. What is happening? We ...