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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.
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.
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Map of Virginia. Buildings, sites, districts, and objects in Virginia listed on the National Register of Historic Places: . As of September 18, 2017, there are 3,027 properties and districts listed on the National Register of Historic Places in all 95 Virginia counties and 37 of the 38 independent cities, including 120 National Historic Landmarks and National Historic Landmark Districts, four ...
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 ...
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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This is intended to be a complete list of the properties and districts on the National Register of Historic Places in the independent city of Virginia Beach, Virginia, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in an online map. [1]