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The Majestic Model #71 introduced in 1927, for example, was a tuned radio frequency receiver with a 9-inch (23 cm) speaker, powered from AC house current. [10] This was a considerable improvement over previous radios having typically poor selectivity and producing inferior sound from old-fashioned horn speakers or earphones.
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The Toot-a-Loop Radio or Panasonic R-72 was a novelty radio made by Panasonic Japan in the early 1970s. This radio was designed to be wrapped around the wrist. It also came with stickers for customizing the unit. Reception was the AM broadcast band only - no FM (the FM version of this radio is called RF-72). The radio was shaped something like ...
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Interest in Morris Beitman's "Most Often Needed Radio Diagrams" resurfaced in the early 1980s with the rise of restoring antique and collectible radios made before the 1940s. Vintage Radio, founded by Morgan E. McMahon, was a publishing company specializing in preserving early radio and television technology. [ 8 ]
The term radio receiver is understood in this article to mean any device which is intended to receive a radio signal in order to generate useful information from the signal, most notably a recreation of the so-called baseband signal (such as audio) which modulated the radio signal at the time of transmission in a communications or broadcast system.
A circuit diagram (or: wiring diagram, electrical diagram, elementary diagram, electronic schematic) is a graphical representation of an electrical circuit. A pictorial circuit diagram uses simple images of components, while a schematic diagram shows the components and interconnections of the circuit using standardized symbolic representations.
By the 1929 model year, Philco was in third place behind Atwater Kent and Majestic (Grigsby-Grunow Corp) in radio sales. In 1930, the company sold 600,000 radios, grossed $34 million, and was the leading radio maker in the country. By 1934, they had captured 30% of the domestic radio market. [9] A Philco 90 "cathedral" style radio from 1931