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High frequency (HF) is the ITU designation [1] for the band of radio waves with frequency between 3 and 30 megahertz (MHz). It is also known as the decameter band or decameter wave as its wavelengths range from one to ten decameters (ten to one hundred meters).
High frequency [18] VHF: 0.03 to 0.3 GHz: Very high frequency [18] UHF: 0.3 to 1 GHz: Ultra-high frequency [18] L: 1 to 2 GHz: Long wave S: 2 to 4 GHz: Short wave C: 4 to 8 GHz: Compromise between S and X X: 8 to 12 GHz: Used in World War II for fire control, X for cross (as in crosshair). Exotic. [19] K u: 12 to 18 GHz: Kurz-under K: 18 to 27 ...
Before moving to satellite radio in 2006, The Howard Stern Show peaked at 20 million listeners on syndicated terrestrial radio. [46] Unlike the above programs, Stern's radio show was broadcast daily for 4–5 hours per day. Paul Harvey, at his peak, drew an estimated 25 million listeners to his 15-minute daily program. [47]
In the United States, FM broadcasting stations currently are assigned to 101 channels, designated 87.9 to 107.9 MHz, within a 20.2 MHz-wide frequency band, spanning 87.8–108.0 MHz. In the 1930s investigations were begun into establishing radio stations transmitting on "Very High Frequency" (VHF) assignments above 30 MHz.
FM radio stations use the very high frequency range of radio frequencies ... 1934 and consisted of the main channel audio program and three ... and Home Service ...
In addition to playing records on phonographs, consumers in the 1930s and 1940s listened to radio programs on separate radio receivers, often large wooden consoles. [1] [2] Home audio devices containing both a record player and a wireless radio receiver were usually called radiograms or stereograms in British English, and consoles in American ...
The dynamic cone loudspeaker, invented in 1924, greatly improved audio frequency response over the previous horn speakers, allowing music to be reproduced with good fidelity. [21] AM radio offered the highest sound quality available in a home audio device prior to the introduction of the high-fidelity, long-playing record in the late 1940s.
The high-frequency wave sent by the tower is modulated with a signal containing visual or audio information. The receiver is then tuned so as to pick up the high-frequency wave and a demodulator is used to retrieve the signal containing the visual or audio information. The broadcast signal can be either analog (signal is varied continuously ...
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