Medium Wave Propagation Characteristics
Medium wave signals have the property of following the curvature of the earth (the groundwave) at all times, and also refracting off the ionosphere at night (skywave). This makes this frequency band ideal for both local and continent-wide service, depending on the time of day. For example, during the day a radio receiver in the state of Colorado is able to receive reliable but weak signals from high-power stations such as 770 KKOB, or 610 KNML 500 miles away from their towers in Albuquerque, New Mexico, due to groundwave propagation. The effectiveness of groundwave signals largely depends on ground conductivity and higher conductivity results in better propagation. At night, the same receiver may pick up signals as far away as 1110 KFAB in Nebraska reliably, depending on atmospheric noise and man-made interference.
Some experiments and trials are planned or under way for a digital modulation, such as Digital Radio Mondiale (DRM).
Read more about this topic: Medium Wave
Famous quotes containing the words medium and/or wave:
“As a medium of exchange,... worrying regulates intimacy, and it is often an appropriate response to ordinary demands that begin to feel excessive. But from a modernized Freudian view, worrying—as a reflex response to demand—never puts the self or the objects of its interest into question, and that is precisely its function in psychic life. It domesticates self-doubt.”
—Adam Phillips, British child psychoanalyst. “Worrying and Its Discontents,” in On Kissing, Tickling, and Being Bored, p. 58, Harvard University Press (1993)
“The city is loveliest when the sweet death racket begins. Her own life lived in defiance of nature, her electricity, her frigidaires, her soundproof walls, the glint of lacquered nails, the plumes that wave across the corrugated sky. Here in the coffin depths grow the everlasting flowers sent by telegraph.”
—Henry Miller (1891–1980)