Radio electronics

electrical device which converts electric power into radio waves, and vice versa

American electrical engineer and inventor (1890–1954)

thumb|A radio repeater retransmits a radio signal.

simple radio receiver circuit used mostly for AM reception

type of radio antenna

common type of radio receiver that shifts the received signal to an easily-processed intermediate frequency

thumb|right|120px|An Ontario Highway 407 toll transponder circa 2009

control system generating an output signal whose phase is fixed relative to the phase of the input signal, keeping input and output frequencies the same

electronic oscillator controlled by a voltage input

the 3–30 kHz range of the electromagnetic spectrum

radio receiver that uses semiconductor active elements

In radio communication, a transceiver is an electronic device which is a combination of a radio transmitter and a receiver, hence the name. It can both transmit and receive radio waves using an antenna, for communication purposes. These two related functions are often combined in a single device to reduce manufacturing costs. The term is also used for other devices which can both transmit and receive through a communications channel, such as optical transceivers which transmit and receive light in optical fiber systems, and bus transceivers which transmit and receive digital data in computer d

nonlinear electrical circuit that creates new frequencies from two signals applied to it

right|thumb|Metal filings coherer designed by Guglielmo Marconi, consisting of a tube containing two electrodes spaced a small distance apart, with metal filings in the space between them The coherer was a primitive form of radio signal detector used in the first radio receivers during the wireless telegraphy era at the beginning of the 20th century. Its use in radio was based on the 1890 findings of French physicist Édouard Branly and adapted by other physicists and inventors over the next ten years. The device consists of a tube or capsule containing two electrodes spaced a small distance a

thumb|right|Pair of AC&E 120 Ω twisted pair (Krone IDC) to 75Ω [[coaxial cable balun transformers. Actual length is about .]]

measure of impedance matching of loads to the characteristic impedance of a transmission line or waveguide

frequency selection subsystem for various receiver systems

vacuum tube which gives a visual indication of the amplitude of an electronic signal

in electricity and electronics, ferromagnetic material around which wires are wound

using conductive or magnetic materials to reduce electromagnetic field intensity

device

vacuum-tube structure that multiplies incident charges by means of secondary emission

Instrument for microwave characteristics measurements (such as VSWR,Power, Frequency,etc).

A duplexer is an electronic device that allows bi-directional (duplex) communication over a single path. In radar and radio communications systems, it isolates the receiver from the transmitter while permitting them to share a common antenna. Most radio repeater systems include a duplexer. Duplexers can be based on frequency (often a waveguide filter), polarization (such as an orthomode transducer), or timing (as is typical in radar).

1949 portable radio

frequency to which a carrier wave is shifted as an intermediate step in transmission or reception

device or circuit that extracts information from a modulated radio frequency current or voltage

United States-based international company

circuit in electronics that allows a signal to be amplified many times

thumb|upright=1.4|A frequency spectrum plot showing intermodulation between two injected signals at 270 and 275 MHz (the large spikes). Visible intermodulation products are seen as small spurs at 280 MHz and 265 MHz. right|3rd order intermodulation products (D3 and D4) are the result of nonlinear behavior of an amplifier. The input power level into the amplifier is increased by 1 dB in each successive frame. The output power of the two carriers (M1 and M2) increases by about 1 dB in each frame, while the 3rd order intermodulation products (D3 and D4) grow by 3 dB

A combined receiver and transmitter that retransmits signals to extend their range

radio receiver / gramophone combination furniture

thumb|right|Diagram showing directivity: the highest power density of this antenna is in the direction of the red lobe

In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a strong input signal. Essentially, squelch is a specialized type of noise gate designed to suppress weak signals. Squelch is used in two-way radios and VHF/UHF radio scanners to eliminate the sound of noise when the radio is not receiving a desired transmission.

type of oscillator

electronic frequency mixer

early radio receiver component

electronic lock that controls access to a building or vehicle without using a traditional mechanical key

device to convert Morse code radio signals into audible tones

A diplexer is a passive device that implements frequency-domain multiplexing. Two ports (e.g., L and H) are multiplexed onto a third port (e.g., S). The signals on ports L and H occupy disjoint frequency bands. Consequently, the signals on L and H can coexist on port S without interfering with each other.

Antenna

replica of the transmitted image, offset in position

radio technology devices

electronic instrument that measures the resonant frequency of nearby unconnected radio frequency tuned circuits

measurement device for radio equipment

Radio receiver with amplifier stages and a detector

unclassified designator for United States military electronic equipment

short electrical transmission line

Radiofacsimile, radiofax or HF fax is an analogue mode for transmitting grayscale images via high frequency (HF) radio waves. It was the predecessor to slow-scan television (SSTV). It was the primary method of sending photographs from remote sites (especially islands) from the 1930s to the early 1970s. It is still in limited use for transmitting weather charts and information to ships at sea.

function describing the extremes of an oscillating signal

device that manages radio functions in smartphones and other radio network interface devices

amplifier applied on high frequency signals coming from an antenna

device used to simulate an electrical load

transmission line in radio antennas

electromechanical generator of high-frequency, high-power current for radio transmitters

transmission line-based electrical circuit

electronic access and authorization system

term

mathematical technique for manipulating signals etc.

type of electronic amplifier