Since these carrier waves can interfere with one another the allotment of them is strictly controlled, and every nation has a government department responsible for regulating them. On the receiving end the carrier wave is stripped off and the signal is “demodulated” to extract the original information from it. Radio signals are based upon the concept of changing or “modulating” a “carrier wave” that is transmitted wirelessly to a receiver. But they do serve their purpose in a number of low-speed data applications and are thus perfect or Arduino and Raspberry Pi experimenters who want to build remote controlled devices or who need to send data without wires. Radio waves are by no means a perfect method of communication, they are subject to interference from a number of sources and can be obstructed by metal or thick walls. Radio waves have a number of advantages over beams of infrared light, the most obvious is that radio waves can travel (to a degree) through walls and most other obstructions.
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