![]() His experiment proved the concept of radio, but its range was only 100 meters. The “receiver” was a metal rod bent into a circle that would electrically resonate to radio waves sent from this apparatus, causing sparks to arc across the short gap where the ends met. The receiver reverses these steps to demodulate the radio waves and recover the original signal in audible or other usable form.įollowing James Clerk Maxwell’s 1862 publication of his famous equations describing electromagnetic waves, Heinrich Hertz demonstrated the “Hertzian Oscillator” in 1878. ![]() This carrier wave is then modulated to carry a signal or meaningful information, whether it be dots and dashes, tones, music or voice. Much like moving a stick rapidly back and forth on the water, these electrons emit radio waves that propagate outwards through space. When the LFR came into being, radio was far from this ubiquitous – it very much required robust, dedicated pieces of equipment that, if not “historic”, are now downright alien to current generations.įirst, some radio basics: transmitters basically work by oscillating electrons back and forth in a wire (the antenna) at a specified radio frequency. As we talk on our cell phones, effortlessly connect our Bluetooth devices and stream data on our Wi-Fi ( note: I already fear how dated this line will read one day!) it’s easy to forget how seamlessly integrated radio technology is in our daily lives – nearly everything large and small constantly "talks" to each other. To better understand this context, the reader may find this primer of the first, tumultuous decades of radio technology, and how it quickly became an inseparable part of aviation, useful. As one its first large scale deployments, the Low Frequency Radio Range (LFR) is inextricably linked to the early history and development of radio.
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