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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.
Early TRF sets had typically two or three tuning knobs and tube filament voltage-control rheostats, all of which had to be set correctly to receive a station. Later (late 1920s) TRF sets had ganged tuning (one knob was used to control all stage tuning capacitors simultaneously), AC house current operation, and eliminated the filament voltage ...
Collins S-Line, featuring separate power supply, receiver, transmitter, and speaker console, c. 1960s. Amateur radio equipment of past eras like the 1940s, 50s, and 60s that are separate vacuum tube transmitters and receivers (unlike modern transceivers) are an object of nostalgia, and many see rehabilitation and on-air use by enthusiasts. [18 ...
The Neutrodyne radio receiver, invented in 1922 by Louis Hazeltine, was a particular type of tuned radio frequency (TRF) receiver, in which the instability-causing inter-electrode capacitance of the triode RF tubes is cancelled out or "neutralized" [1] [2] to prevent parasitic oscillations which caused "squealing" or "howling" noises in the speakers of early radio sets.
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.
The Neutrodyne receiver, invented in 1922 by Louis Hazeltine, [133] [134] was a TRF receiver with a "neutralizing" circuit added to each radio amplification stage to cancel the feedback to prevent the oscillations which caused the annoying whistles in the TRF.
Sep 19, 1998; Columbus, OH, USA; FILE PHOTO; Ohio State Buckeyes receiver David Boston (9) in action against Missouri Tigers during the 1998 season at Ohio Stadium. The Buckeyes beat the Tigers 35-14.
This is an accepted version of this page This is the latest accepted revision, reviewed on 30 January 2025. Classified advertisements website Craigslist Inc. Logo used since 1995 Screenshot of the main page on January 26, 2008 Type of business Private Type of site Classifieds, forums Available in English, French, German, Dutch, Spanish, Italian, Portuguese Founded 1995 ; 30 years ago (1995 ...