Electronic Communications
Dale R. Patrick, Stephen W. Fardo · River Publishers eBooks · 2020
In this chapter, the authors investigate how sound is transmitted through the air by electromagnetic waves. This type of communication uses high-frequency alternating current or radio frequency energy for its operation. Two-way mobile communication systems have a transmitter and a receiver at each location. This type of system permits direct communication between each location. A citizen’s band radio and cellular telephones are considered to be two-way communication. The electromagnetic wave of an RF communication system radiates out from the antenna of the transmitter. This wave is the end result of an interaction between electric and magnetic fields. Stronger electromagnetic waves can be effectively used in a radio communication system. These waves do not affect humans like the high-powered sound waves. The receiver of a CW communication system is responsible for intercepting an RF signal and recovering the information it contains.