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Radio sets from before 1920 are rarities, and are probably military artifacts. Sets made prior to approximately 1924 were usually made on wooden breadboards, in small cupboard style cabinets, or sometimes on an open sheet metal chassis. Homemade sets remained a strong sector of radio production until the early 1930s.
Crystal radio used as a backup receiver on a World War II Liberty ship. While it never regained the popularity and general use that it enjoyed at its beginnings, the crystal radio circuit is still used. The Boy Scouts have kept the construction of a radio set in their program since the 1920s. A large number of prefabricated novelty items and ...
A tuned radio frequency receiver (or TRF receiver) is a type of radio receiver that is composed of one or more tuned radio frequency (RF) amplifier stages followed by a detector (demodulator) circuit to extract the audio signal and usually an audio frequency amplifier. This type of receiver was popular in the 1920s.
English: A typical antique vacuum tube radio from the 1920s, with horn loudspeaker (right) and batteries to run it. The central unit is the Paragon Model RN-10 regenerative receiver made by Adams-Morgan Co. The unit on the left is a 3 tube audio amplifier unit, the Paragon DA-2 which provided the power to drive the loudspeaker. Up until the mid ...
Today it is the site of Marconi Park. It was an early radio transmitter facility built in 1913 and operated by the American Marconi. [44] After the partial failure of transatlantic telegraph cables, the facility was confiscated by the US Navy in January, 1918 to provide vital transatlantic communications during World War I. The New Brunswick ...
The RCA model R7 Superette superheterodyne table radio. This is a list of notable radios, which encompasses specific models and brands of radio transmitters, receivers and transceivers, both actively manufactured and defunct, including receivers, two-way radios, citizens band radios, shortwave radios, ham radios, scanners, weather radios and airband and marine VHF radios.
Rare collectibles from the worlds of music and film, including gold rings owned by Elvis Presley and a letter written by Beach Boy Brian Wilson, will be up for auction this weekend. The "Artifacts ...
The Neutrodyne radio receiver, invented in 1922 by Louis Hazeltine, was a particular type of tuned radio frequency (TRF) receiver, in which the instability-causing inter-electrode capacitance of the triode RF tubes is cancelled out or "neutralized" [1] [2] to prevent parasitic oscillations which caused "squealing" or "howling" noises in the speakers of early radio sets.