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Type 'C' Form 'A' twin detector crystal radio set, manufactured by British Thomson Houston Ltd. in 1924, kept at the Museum of the radio - Monteceneri (Switzerland) Early radio telegraphy used spark gap and arc transmitters as well as high-frequency alternators running at radio frequencies. The coherer was the first means of detecting a radio ...
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 used salvaged domestic wiring for an antenna, a double-edged safety-razor blade and pencil lead (or bent safety-pin) for a detector, and a tin can ...
The crystal radio became a cheap alternative receiver used in emergencies and by people who could not afford tube radios: [7] teenagers, the poor, and those in developing countries. [54] Building a crystal set remained a popular educational project to introduce people to radio, used by organizations like the Boy Scouts. [16]
A buzzer circuit, powered by a BA-4 battery, was mounted in the box cover and used to adjust the crystal. The set was compact and mounted in a wooden box, type BC-14. The lid of the box held the buzzer circuit, detectors, a screwdriver, two P-11 telephone headsets, spare parts, extra crystals, and an operating manual, “Radio Pamphlet No. 3 ...
The Majestic "Smart Set" line of less expensive, but stylish, table radios was introduced in mid-1933 and enjoyed strong sales. The model 161 (pictured at top) produced in 1933 was a superheterodyne receiver with Art Deco -style chrome decorative trim adorning the loudspeaker grill cloth and a hand-rubbed mahogany cabinet, having a list price ...
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The most common type of receiver before vacuum tubes was the crystal set, although some early radios used some type of amplification through electric current or battery. Inventions of the triode amplifier , motor-generator , and detector enabled audio radio.
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