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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 ...
In radio equipment, Automatic Frequency Control (AFC), also called Automatic Fine Tuning (AFT), is a method or circuit to automatically keep a resonant circuit tuned to the frequency of an incoming radio signal. It is primarily used in radio receivers to keep the receiver tuned to the frequency of the desired station.
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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.
The first step on the road to radio control. James A. Gupton, Jr. 52/3: March 1981 Computer-Selectric interface: An easy way to use an IBM Selectric terminal/printer for output from your computer. E. G. Brooner: 52/4: April 1981 Unicorn-1 robot: Finishing up the conversion to radio control. James A. Gupton, Jr. 52/4: April 1981 Audio-signal ...
A tuned radio frequency receiver (or TRF receiver) is a type of radio receiver that is composed of one or more tuned radio frequency (RF) amplifier stages followed by a detector (demodulator) circuit to extract the audio signal and usually an audio frequency amplifier. This type of receiver was popular in the 1920s.
The Electronics Project has a list of desirable features for a circuit drawing program. This table attempts to summarize which of the features each of the above programs has. The "Easy circuits" column is specifically answering the question: "Is it easy to use this program to draw circuit layouts?"
English: Circuit of the simplest possible crystal radio receiver. Circuits of this type were used in the first experimental crystal radio receivers in the pioneering days of radio, just after 1900. It consists of a crystal detector (semiconductor diode) DI connected between a long wire antenna and ground, with a sensitive earphone E1 attached ...