In analog radio communication—whether in amateur radio, commercial two-way radios, emergency services or industrial PMR/LMR systems—unwanted noise and co-channel interference have always been fundamental challenges. Traditional carrier-squelch circuits open the audio path whenever an RF signal is present, but this includes static, distant stations, overlapping users and accidental key-ups. To…
The Duga-3 over-the-horizon (OTH) radar—globally known as the “Russian Woodpecker” because of its distinctive 10 Hz tapping sound on shortwave radio—remains one of the most iconic, powerful and controversial radio-engineering systems of the Cold War. Between 1976 and 1989, millions of radio operators, aviation professionals, HF engineers and intelligence agencies…
Australia has officially entered uncharted territory by becoming the first country to block social-media access for everyone under the age of 16. The unprecedented measure, which took effect on December 10, represents the most aggressive government attempt so far to curb the influence of digital platforms on young people. Legislators…
In an age of digital communication, error correction, and smart radios, it might seem outdated—even strange—that the global aviation industry still relies on amplitude modulation (AM) for voice communication. Yet, every commercial pilot, air traffic controller, and military aircraft across the world continues to use AM radios in the VHF…