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The Amateur radio R-S-T system signal report format currently in use was first developed in 1934. [citation needed] As early as 1943, the U.S and UK military published the first guidance that included the modern "Weak but readable", "Strong but distorted", and "Loud and clear" phrases. [citation needed]
In a closed-box loudspeaker, the air inside the box acts as a spring, returning the cone to the zero position in the absence of a signal. A significant increase in the effective volume of a closed-box loudspeaker can be achieved by a filling of fibrous material, typically fiberglass, bonded acetate fiber (BAF) or long-fiber wool.
A transmission line loudspeaker is a loudspeaker enclosure design which uses the topology of an acoustic transmission line within the cabinet, compared to the simpler enclosures used by sealed (closed) or ported (bass reflex) designs.
A horn loudspeaker is a loudspeaker or loudspeaker element which uses an acoustic horn to increase the overall efficiency of the driving element(s). A common form (right) consists of a compression driver which produces sound waves with a small metal diaphragm vibrated by an electromagnet, attached to a horn, a flaring duct to conduct the sound waves to the open air.
The long wave signal on 200 kHz / 1500 metres was transmitted from Droitwich in the English Midlands [6] (as it still is today for BBC Radio 4, although adjusted slightly to 198 kHz / 1515 metres from 1 February 1988) [7] [8] and gave fairly good coverage of most of the United Kingdom, although a number of low-power medium wave transmitters (using 1215 kHz / 247 metres) were added later to ...
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Orson Welles, arms upraised, directing a rehearsal of CBS Radio's The Mercury Theatre on the Air (1938) This is a comprehensive listing of the radio programs made by Orson Welles . Welles was often uncredited for his work, particularly in the years 1934–1937, and he apparently kept no record of his broadcasts.
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