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Narrow-Band Radio Transmission
In narrow-band radio communications (also called single-frequency radio), transmissions occur at a single radio frequency. The range of narrow-band radio is higher than infrared, effectively enabling mobile computing over a limited area. Neither the receiver nor the transmitter must be placed along a direct line of sight; the signal can bounce off walls, buildings, and even the atmosphere, but heavy walls, such as steel or concrete enclosures, can block the signal.