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The diagram (right) shows one of the most common single tube reflex circuits from the early 1920s. It functioned as a TRF receiver with one stage of RF and one stage of audio amplification. The radio frequency (RF) signal from the antenna passes through the bandpass filter C 1, L 1, L 2, C 2 and is applied to the grid of the directly heated ...
A radio transmitter or just transmitter is an electronic device which produces radio waves with an antenna. Radio waves are electromagnetic waves with frequencies between about 30 Hz and 300 GHz. The transmitter itself generates a radio frequency alternating current, which is applied to the antenna. When excited by this alternating current, the ...
The term radio receiver is understood in this article to mean any device which is intended to receive a radio signal in order to generate useful information from the signal, most notably a recreation of the so-called baseband signal (such as audio) which modulated the radio signal at the time of transmission in a communications or broadcast system.
Use it with logic circuits or as an audio or RF signal generator. Gary McClellan 51/10 October 1980 Unicorn-1 robot Part 3. Design and construction of the mobility base. James A. Gupton, Jr. 51/10 October 1980 Circuit design station Prototype and debug your circuits using this battery-powered design station. James Barbarello 51/11 November 1980
Radio receivers are essential components of all systems that use radio. The information produced by the receiver may be in the form of sound, video , or digital data. [1] A radio receiver may be a separate piece of electronic equipment, or an electronic circuit within another device.
So-called "All American Five" vacuum tube radio receivers used a power supply that could work on either AC or DC. An AC/DC receiver design is a style of power supply of vacuum tube radio or television receivers that eliminated the bulky and expensive mains transformer. A side-effect of the design was that the receiver could in principle operate ...
The first U.S. patent application for SSB modulation was filed on December 1, 1915, by John Renshaw Carson. [3] The U.S. Navy experimented with SSB over its radio circuits before World War I. [4] [5] SSB first entered commercial service on January 7, 1927, on the longwave transatlantic public radiotelephone circuit between New York and London.
[1] [2] Spark-gap transmitters were the first type of radio transmitter, and were the main type used during the wireless telegraphy or "spark" era, the first three decades of radio, from 1887 to the end of World War I. [3] [4] German physicist Heinrich Hertz built the first experimental spark-gap transmitters in 1887, with which he proved the ...