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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, 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 ...
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.
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]
Virginia Beach is a resort city, and the Oceanfront is a primary tourist attraction. The boardwalk, substantially updated in 1988, is a concrete path linking forty hotels and other attractions via pedestrian walkway and separated bike path [ 2 ] -- which in turn connects to nearby trails and surface streets.
VIRGINIA BEACH — Local history proponents are ramping up efforts to save a city-owned resort area building to keep it from being razed to make room for redevelopment. Councilman Worth Remick ...
It consists of 70 acres (28 ha), roughly bounded by Virginia Beach Boulevard, First Colonial Road, and North Oceana Boulevard. This area was platted out in 1906 with a rectilinear street grid, and saw development of its commercial corridors in the 1930s.
Murphy’s Irish Pub at the Oceanfront got permission Tuesday to permanently expand an outdoor space it originally used temporarily during the pandemic. The City Council approved the restaurant ...