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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.
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 ...
In 1984, Cowan moved to Cincinnati, Ohio to be the Curator of Archaeology at the Cincinnati Museum of Natural History & Science. He has published in the fields of American archaeology and paleoethnobotany. [2] In 1995, he left academia and founded his antiques business, Cowan's Auctions, Inc. in Cincinnati, Ohio. [2]
NEWCOMERSTOWN ‒ The vehicles and equipment of the former Newcomerstown Emergency Rescue Squad, Inc. (NERS) are being sold through an online auction.. The auction, conducted by the company ...
A receiver circuit that used larger amounts of regeneration in a more complicated way to achieve even higher amplification, the superregenerative receiver, was also invented by Armstrong in 1922. [ 11 ] [ 5 ] : p.190 It was never widely used in general commercial receivers, but due to its small parts count it was used in specialized applications.
Jayden Scott, left, Marcia Scott and Michele Scott prepare to open MJM Vintage Market in Ashland. A grand opening is scheduled for Jan. 15.
The Getty Villa art museum is threatened by the flames of the wind-driven Palisades Fire in Pacific Palisades, California, Jan. 7, 2025. A fast-moving brushfire in a Los Angeles suburb burned ...
The properties are distributed across all parts of Cincinnati. For the purposes of this list, the city is split into three regions: Downtown Cincinnati, which includes all of the city south of Central Parkway, west of Interstates 71 and 471, and east of Interstate 75; Eastern Cincinnati, which includes all of the city outside Downtown Cincinnati and east of Vine Street; and Western Cincinnati ...
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