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This 1920s TRF radio manufactured by Signal is constructed on a breadboard Tuning a TRF receiver, like this 5 tube Neutrodyne set from 1924 with two stages of RF amplification, was a complicated process. The three tuned circuits, controlled by the 3 large knobs, had to be tuned in unison to the new station.
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English: Block diagram of a tuned radio frequency (TRF) receiver, a type of radio receiver circuit invented in 1916 by Ernst Alexanderson and widely used in the vacuum tube receivers of the 1920s.
English: Block diagram of a tuned radio frequency (TRF) receiver, the simplest type of amplifying radio receiver circuit. It consists of one or more tuned RF amplifiers, each consisting of a tuned circuit which functioned as a bandpass filter followed by a radio frequency (RF) amplifier; a detector (demodulator) to extract the audio waveform from the radio carrier wave; followed by an audio ...
Gift shop: Clothing, toys, books and magazines, antique and reproduction radios, even some floor-model wind-up Victrola phonographs for sale, with records. Ham and short wave radios: Short-wave receivers and transmitters as used by "hams" and hobbyists. The "Big H's": Hallicrafters, Hammarlund, Heath and National (OK, that's an N, but it looks ...
Delaplane Historic District is a national historic district located at Delaplane, Fauquier County, Virginia.. The rural village of Delaplane was founded in 1852 around the Piedmont Station of the newly chartered Manassas Gap Railroad (originally to link the Alexandria and Orange Railroad with the line running into the Shenandoah Valley at Manassas; still operated by the Norfolk Southern Railroad).
Wharf Area Historic District is a national historic district located at Staunton, Virginia. The district encompasses 22 contributing buildings and 4 contributing structures. It is a warehouse and commercial district characterized by rows of late-19th century and early-20th century storefronts and an elongated plaza framed by small warehouses.
Audio reproduction quality of TRF sets was limited by the available loudspeakers. "High Fidelity" was not to become a radio marketing concept until the mid-1930s and was not realized until the advent of FM broadcasting. Reaction sets, also known as regenerative receivers, rely on positive feedback to achieve adequate gain. This approach ...
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