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Radio SystemsRadio systems are operated by incoming signals of several types. In radio telephony, speech signals control the transmitter output. In radio telegraphy, the signals are code characters. In radio broadcasting, the signals are those of speech and music. In picture transmission, facsimile transmission, and television, the information to be transmitted is in the form of electric-current variations produced as the image to be transmitted is scanned. In a radio system, signals such as just discussed are used to modulate1 a radio-frequency carrier, and the information to be transmitted is translated to a frequency band in the radio-frequency spectrum. The information, then existing at radio frequencies, is transmitted through space and at the receiving station is demodulated1 and returned to its original form for reception.
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Last Update: 2011-05-30