Radio electronics

A duplexer is an electronic device that allows bi-directional (duplex) communication over a single path.

A crystal radio receiver, also called a crystal set or cat's whisker receiver, is a very simple radio receiver, popular in the early days of radio.

A microphone, colloquially nicknamed mic or mike (/ˈmaɪk/), is a transducer that converts sound into an electrical signal.

A magnetic core is a piece of magnetic material with a high magnetic permeability used to confine and guide magnetic fields in electrical, electromechanical and magnetic devices such as electromagnets, transformers, electric motors, generators, inductors, magnetic recording heads, and magnetic assemblies.

In telecommunications, squelch is a circuit function that acts to suppress the audio (or video) output of a receiver in the absence of a sufficiently strong desired input signal.

An operational amplifier (often op-amp or opamp) is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output.

An electronic oscillator is an electronic circuit that produces a periodic, oscillating electronic signal, often a sine wave or a square wave.

A differential amplifier is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs.

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.

Izvestiya Vysshikh Uchebnykh Zavedenii.

In communications and electronic engineering, an intermediate frequency (IF) is a frequency to which a carrier wave is shifted as an intermediate step in transmission or reception.

A transceiver is a device comprising both a transmitter and a receiver that are combined and share common circuitry or a single housing.

In telecommunication, a transponder is one of two types of devices.

A voltage-controlled oscillator or VCO is an electronic oscillator whose oscillation frequency is controlled by a voltage input.

A superheterodyne receiver (often shortened to superhet) is a type of radio receiver that uses frequency mixing to convert a received signal to a fixed intermediate frequency (IF) which can be more conveniently processed than the original carrier frequency.

A phase-locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is related to the phase of an input signal.

Cell Phone Signal Booster is a Houston-based venture by Accessory Fulfillment Center, LLC.

Klotz Digital AG was a manufacturer of audio media products based in Munich, Germany.

A Plectron is a specialized VHF/UHF single-channel, emergency alerting radio receiver, used to activate emergency response personnel, and disaster warning systems.

A radio frequency power amplifier (RF power amplifier) is a type of electronic amplifier that converts a low-power radio-frequency signal into a higher power signal.

Ward-Beck Systems commonly referred to as Ward-Beck or simply WBS, is a Canadian manufacture of broadcast audio and video equipment.

A keyless entry system is an electronic lock that controls access to a building or vehicle without using a traditional mechanical key.

In telecommunications, particularly in radio frequency, signal strength (also referred to as field strength) refers to the transmitter power output as received by a reference antenna at a distance from the transmitting antenna.

Born on December 1911 in Cook County, Illinois.

Rockwell Collins, Inc.

In physics and engineering, the envelope of an oscillating signal is a smooth curve outlining its extremes.

In television, a ghost is a replica of the transmitted image, offset in position, that is super-imposed on top of the main image.

A television antenna, or TV aerial, is an antenna specifically designed for the reception of over-the-air broadcast television signals, which are transmitted at frequencies from about 41 to 250 MHz in the VHF band, and 470 to 960 MHz in the UHF band in different countries.

Eugene F. McDonald (1886–1958) founded Zenith Radio in 1921, a major American radio and electronics manufacturer for most of the twentieth century.

The International Radio Corporation (IRC) was an American radio receiver manufacturing company based in Ann Arbor, Michigan.

goTenna (goTenna Inc.) is a Brooklyn, New York-based startup that designs and develops technologies for off-grid and decentralized communications.

A dummy load is a device used to simulate an electrical load, usually for testing purposes.

In electronics, an antenna amplifier (also: aerial eamplifier (booster), Am antennefier) is a device that amplifies an antenna signal, usually into an output with the same impedance as the input impedance.

A network analyzer is an instrument that measures the network parameters of electrical networks.

An Indoor antenna is a type of radio or TV antenna placed indoors, as opposed to being mounted on the roof.

In electronics, a mixer, or frequency mixer, is a nonlinear electrical circuit that creates new frequencies from two signals applied to it.

Load-pull is the colloquial term applied to the process of systematically varying the impedance presented to a device under test (DUT), most often a transistor, to assess its performance and the associated conditions to deliver that performance in a network.

The hot wire barretter was a demodulating detector, invented in 1902 by Reginald Fessenden, that found limited use in early radio receivers.