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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.
The earphone is on left. The antenna wire, right, has a clip to attach to metal objects such as a bedspring, which serve as an additional antenna to improve reception. A crystal radio receiver, also called a crystal set, is a simple radio receiver, popular in the early days of radio. It uses only the power of the received radio signal to ...
Majestic radios from the Grigsby-Grunow halcyon era of the late 1920s–early 1930s have become antique radio collectors' items, prized for their craftmanship and appearance. [ 49 ] [ 50 ] Some models, such as the Art Deco -styled model 161 produced in 1933, have been fully restored.
The Wireless Set No. 19 Group, with members virtually worldwide, caters to those who collect, restore and/or operate vintage military communications equipment, with emphasis on the World War II Wireless Set No. 19 radio. Many members are Amateur Radio operators who use the equipment for on-air contacts with others.
The invention of the superheterodyne receiver solved this problem, and the first radios with a heterodyne radio receiver went for sale in 1924. But it was costly, and the technology was shelved while waiting for the technology to mature, and in 1929 the Radiola 66 and Radiola 67 went for sale.
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.
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A family listening to an early broadcast using a crystal radio receiver in 1922. Crystal sets, used before the advent of vacuum tube radios in the 1920s, could not drive loudspeakers, so the family had to listen on earphones. The person generally credited as the primary early developer of AM technology is Canadian-born inventor Reginald Fessenden.