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RADIO WAVESRadio signals emanate from the antenna of a transmitter partly in the form of electromagnetic waves. Such waves are radiated from any current-carrying conductor when the current periodically changes in magnitude and direction. The radiation of an electromagnetic wave from an antenna may be compared in some respects to a sound wave sent out by a vibrating tuning fork. The sound wave is a mechanical compression and rarefaction of the air caused by the vibration of the tuning fork (see Fig. 14-1).
Sound wave emanating from a tuning fork.
Thomas K. Eismin: Aircraft Electricity and Electronics, Sixth Edition. RADIO WAVES, Chapter (McGraw-Hill Professional, 2014), AccessEngineering Export