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Around 1920, crystal sets were superseded by the first amplifying receivers, which used vacuum tubes. With this technological advance, crystal sets became obsolete for commercial use [ 11 ] but continued to be built by hobbyists, youth groups, and the Boy Scouts [ 14 ] mainly as a way of learning about the technology of radio.
Suomi KP/-31. 20-, 36- or 50-round box, 40- or 71-round drum. Also modified German MP 38 & MP 40 32-round box magazine. The Suomi KP/-31 (Finnish: Suomi-konepistooli m/31 or "Finland-machine-pistol mod. 1931") is a Finnish submachine gun that was mainly used during World War II. It is a descendant of the M-22 prototype and the KP/-26 production ...
AN/ARC-5. VHF transmitter T-23/ARC-5 and HF transmitter T-20/ARC-5 on rack MT-71/ARC-5. The AN/ARC-5 Command Radio Set is a series of radio receivers, transmitters, and accessories carried aboard U.S. Navy aircraft during World War II and for some years afterward. It is described as "a complete multi-channel radio transmitting and receiving set ...
World War 2 created widespread urgent need for radio communication, and foxhole sets were built by people without access to traditional radio parts. A foxhole radio is a simple crystal sets radio receiver cobbled together from whatever parts one could make (which were very few indeed) or scrounged from junked equipment. Such a set typically ...
Wireless Set No. 19. Wireless Set No. 19 MK II at the Infoage museum. The Wireless Set No. 19 was a Second World War mobile radio transceiver designed for use by armoured troops of the British Army. First introduced in 1940, the No. 19 began to replace the pre-war Wireless Set No. 11. Two modified versions were introduced, Mk. II in 1941 and Mk.
Utility Radio. Wartime civilian receiver, 1944-1945. The Utility Radio or Wartime Civilian Receiver was a valve domestic radio receiver, manufactured in Great Britain during World War II starting in July 1944. It was designed by G.D. Reynolds of Murphy Radio. Both AC and battery-operated versions were made. [1][2][3]
The "asymmetric conduction" of electric current across electrical contacts between a crystal and a metal was discovered in 1874 by Karl Ferdinand Braun. [6] Crystals were first used as radio wave detectors in 1894 by Jagadish Chandra Bose in his microwave experiments. [7][8] Bose first patented a crystal detector in 1901. [9]
A portable battery-powered AM/FM broadcast receiver, used to listen to audio broadcast by local radio stations. A modern communications receiver, used in two-way radio communication stations to talk with remote locations by shortwave radio. Girl listening to vacuum tube console radio in the 1940s.