The Special Radio category covers unusual, niche and technically interesting radio communication systems that do not fit into ordinary consumer wireless, ham radio or standard broadcast categories. Topics include underground and cave radio, VLF and ELF communication, emergency radio systems, body-worn and referee intercoms, industrial wireless links, covert or low-probability-of-intercept communication concepts, maritime and aviation radio, railway and utility communication, telemetry, remote control systems, experimental antennas, legacy radio networks and specialized professional RF equipment. The articles focus on how these systems work, why they were developed, what frequencies and modulation methods they use, and where they are still relevant in modern communication technology.
What NAVTEX Is And Why It Still Matters For decades, NAVTEX has quietly operated in the background of global maritime communication, delivering weather warnings, navigational alerts, search and rescue information, and safety messages to ships around the world. While modern vessels increasingly rely on satellite systems and internet-based communication, NAVTEX…
In movies, tracking devices usually work far better than real radio technology, positioning systems, and power management would allow. An agent attaches a tiny disc to the underside of a car, and a few seconds later the target appears as a blinking dot on a digital map. The signal does…
Iran International TV has recently attracted attention across shortwave radio communities after reports emerged that the station’s audio is being relayed on shortwave frequencies via Spaceline facilities in Bulgaria. For many casual media consumers, this may sound unusual. A modern television news channel, available through satellite, internet platforms and digital…
The world of radio has always carried a special aura. There is a good reason for that: radio is invisible, signals travel through the air, reception is clear one moment and noisy the next, and an unidentified transmission can easily create the feeling that we have stumbled upon something secret,…
Cave rescue operations represent one of the most technically demanding environments for communication systems. Unlike surface scenarios, where multiple technologies can coexist—cellular networks, satellite links, Wi-Fi, and conventional radios—underground environments strip away nearly all of these options. Solid rock, irregular geometry, moisture, and depth combine to create a hostile propagation…
For decades, numbers stations have occupied a peculiar place in the world of radio. They are at once highly technical and deeply mysterious. To intelligence historians, utility monitors, and experienced shortwave listeners, they are recognizable as a special category of one-way transmissions used to move coded information across long distances….