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Block diagram of a crystal radio receiver Circuit diagram of a simple crystal radio. A crystal radio can be thought of as a radio receiver reduced to its essentials. [3] [39] It consists of at least these components: [22] [40] [41] An antenna in which electric currents are induced by radio waves.
Radio control (often abbreviated to RC) is the use of control signals transmitted by radio to remotely operate a device. Examples of simple radio control systems are garage door openers and keyless entry systems for vehicles, in which a small handheld radio transmitter unlocks or opens doors. Radio control is also used for control of model ...
Radio receiver design. Radio receiver design includes the electronic design of different components of a radio receiver which processes the radio frequency signal from an antenna in order to produce usable information such as audio. The complexity of a modern receiver and the possible range of circuitry and methods employed are more generally ...
Software-defined radio ( SDR) is a radio communication system where components that conventionally have been implemented in analog hardware (e.g. mixers, filters, amplifiers, modulators / demodulators, detectors, etc.) are instead implemented by means of software on a computer or embedded system. [ 1] While the concept of SDR is not new, the ...
A radio receiver may be a separate piece of electronic equipment, or an electronic circuit within another device. The most familiar type of radio receiver for most people is a broadcast radio receiver, which reproduces sound transmitted by radio broadcasting stations, historically the first mass-market radio application. A broadcast receiver is ...
У = RF amplifier stages, Д = frequency discriminator stage. 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 ...
Tuned radio frequency receiver. 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.
Load management. Daily load diagram; Blue shows real load usage and green shows ideal load. Load management, also known as demand-side management ( DSM ), is the process of balancing the supply of electricity on the network with the electrical load by adjusting or controlling the load rather than the power station output.