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Crystal radio, the Glossary

A crystal radio receiver, also called a crystal set, is a simple radio receiver, popular in the early days of radio.^[1]

150 relations: Alexanderson alternator, Allies of World War II, Alternating current, AM broadcasting, Amateur radio operator, Amplifier, Amplitude modulation, Antenna (radio), Antenna tuner, Anzio, Arc converter, Audio signal, Autotransformer, Bandwidth (signal processing), Barbed wire, Batteryless radio, BBC, Bias, Biasing, Bornite, Box-spring, Boy Scouts of America, Broadcasting, Camille Tissot, Capacitance, Capacitor, Carrier wave, Coherer, Competition, Counterpoise (ground system), Crystal detector, Crystal earpiece, Current–voltage characteristic, Decoupling capacitor, Demodulation, Detector (radio), Diode, Direct current, DXing, Electric battery, Electric current, Electrical impedance, Electrical reactance, Electrical resistance and conductance, Electrolytic detector, Electromagnet, Envelope detector, Fad, Ferrite core, Fire escape, ... Expand index (100 more) »
Amateur radio receivers
Bangladeshi inventions
History of radio technology
Receiver (radio)
Types of radios

Alexanderson alternator

An Alexanderson alternator is a rotating machine, developed by Ernst Alexanderson beginning in 1904, for the generation of high-frequency alternating current for use as a radio transmitter. Crystal radio and Alexanderson alternator are history of radio technology and radio electronics.

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Allies of World War II

The Allies, formally referred to as the United Nations from 1942, were an international military coalition formed during World War II (1939–1945) to oppose the Axis powers.

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Alternating current

Alternating current (AC) is an electric current that periodically reverses direction and changes its magnitude continuously with time, in contrast to direct current (DC), which flows only in one direction.

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AM broadcasting

AM broadcasting is radio broadcasting using amplitude modulation (AM) transmissions.

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Amateur radio operator

An amateur radio operator is someone who uses equipment at an amateur radio station to engage in two-way personal communications with other amateur operators on radio frequencies assigned to the amateur radio service.

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Amplifier

An amplifier, electronic amplifier or (informally) amp is an electronic device that can increase the magnitude of a signal (a time-varying voltage or current).

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Amplitude modulation

Amplitude modulation (AM) is a modulation technique used in electronic communication, most commonly for transmitting messages with a radio wave.

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Antenna (radio)

In radio engineering, an antenna (American English) or aerial (British English) is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver. Crystal radio and antenna (radio) are radio electronics.

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Antenna tuner

An antenna tuner, a matchbox, transmatch, antenna tuning unit (ATU), antenna coupler, or feedline coupler is a device connected between a radio transmitter or receiver and its antenna to improve power transfer between them by matching the impedance of the radio to the antenna's feedline.

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Anzio

Anzio (also) is a town and comune on region of Italy, about south of Rome.

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Arc converter

The arc converter, sometimes called the arc transmitter, or Poulsen arc after Danish engineer Valdemar Poulsen who invented it in 1903, was a variety of spark transmitter used in early wireless telegraphy. Crystal radio and arc converter are history of radio technology and radio electronics.

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Audio signal

An audio signal is a representation of sound, typically using either a changing level of electrical voltage for analog signals, or a series of binary numbers for digital signals.

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Autotransformer

In electrical engineering, an autotransformer is an electrical transformer with only one winding.

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Bandwidth (signal processing)

Bandwidth is the difference between the upper and lower frequencies in a continuous band of frequencies.

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Barbed wire

Roll of modern agricultural barbed wire Barbed wire, also known as barb wire, is a type of steel fencing wire constructed with sharp edges or points arranged at intervals along the strands.

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Batteryless radio

A batteryless radio is a radio receiver which does not require the use of a battery to provide it with electrical power. Crystal radio and batteryless radio are types of radios.

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BBC

The British Broadcasting Corporation (BBC) is a British public service broadcaster headquartered at Broadcasting House in London, England.

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Bias

* Bias is a disproportionate weight in favor of or against an idea or thing, usually in a way that is inaccurate, closed-minded, prejudicial, or unfair.

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Biasing

In electronics, biasing is the setting of DC (direct current) operating conditions (current and voltage) of an electronic component that processes time-varying signals.

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Bornite

Bornite, also known as peacock ore, is a sulfide mineral with chemical composition that crystallizes in the orthorhombic system (pseudo-cubic).

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Box-spring

Queen size box-spring on metal bed frame 8-way hand-tied box spring A box-spring (or divan in some countries) is a type of bed base typically consisting of a sturdy wooden frame covered in cloth and containing springs.

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Boy Scouts of America

tag and place it alphabetically by ref name.

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Broadcasting

Broadcasting is the distribution of audio or video content to a dispersed audience via any electronic mass communications medium, but typically one using the electromagnetic spectrum (radio waves), in a one-to-many model.

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Camille Tissot

Camille Papin Tissot (15 October 1868 – 2 October 1917) was a French naval officer and pioneer of wireless telegraphy who established the first French operational radio connections at sea.

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Capacitance

Capacitance is the capability of a material object or device to store electric charge.

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Capacitor

In electrical engineering, a capacitor is a device that stores electrical energy by accumulating electric charges on two closely spaced surfaces that are insulated from each other.

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Carrier wave

In telecommunications, a carrier wave, carrier signal, or just carrier, is a periodic waveform (usually sinusoidal) that carries no information that has one or more of its properties modified (the called modulation) by an information-bearing signal (called the message signal or modulation signal) for the purpose of conveying information.

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Coherer

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. Crystal radio and coherer are history of radio technology and radio electronics.

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Competition

Competition is a rivalry where two or more parties strive for a common goal which cannot be shared: where one's gain is the other's loss (an example of which is a zero-sum game).

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Counterpoise (ground system)

In electronics and radio communication, a counterpoise is a network of suspended horizontal wires or cables (or a metal screen), used as a substitute for an earth (ground) connection in a radio antenna system. Crystal radio and counterpoise (ground system) are radio electronics.

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Crystal detector

A crystal detector is an obsolete electronic component used in some early 20th century radio receivers that consists of a piece of crystalline mineral which rectifies the alternating current radio signal. Crystal radio and crystal detector are Bangladeshi inventions, history of radio technology, Indian inventions and radio electronics.

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Crystal earpiece

A crystal earpiece is a type of piezoelectric earphone, producing sound by using a piezoelectric crystal, a material that changes its shape when electricity is applied to it.

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Current–voltage characteristic

A current–voltage characteristic or I–V curve (current–voltage curve) is a relationship, typically represented as a chart or graph, between the electric current through a circuit, device, or material, and the corresponding voltage, or potential difference, across it.

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Decoupling capacitor

In electronics, a decoupling capacitor is a capacitor used to decouple (i.e. prevent electrical energy from transferring to) one part of a circuit from another.

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Demodulation

Demodulation is extracting the original information-bearing signal from a carrier wave. Crystal radio and Demodulation are radio electronics and receiver (radio).

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Detector (radio)

In radio, a detector is a device or circuit that extracts information from a modulated radio frequency current or voltage. Crystal radio and detector (radio) are radio electronics.

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Diode

A diode is a two-terminal electronic component that conducts current primarily in one direction (asymmetric conductance).

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Direct current

Direct current (DC) is one-directional flow of electric charge.

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DXing

DXing, taken from DX, the telegraphic shorthand for "distance" or "distant", is the hobby of receiving and identifying distant radio or television signals, or making two-way radio contact with distant stations in amateur radio, citizens band radio or other two-way radio communications.

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Electric battery

An electric battery is a source of electric power consisting of one or more electrochemical cells with external connections for powering electrical devices.

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Electric current

An electric current is a flow of charged particles, such as electrons or ions, moving through an electrical conductor or space.

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Electrical impedance

In electrical engineering, impedance is the opposition to alternating current presented by the combined effect of resistance and reactance in a circuit.

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Electrical reactance

In electrical circuits, reactance is the opposition presented to alternating current by inductance and capacitance.

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Electrical resistance and conductance

The electrical resistance of an object is a measure of its opposition to the flow of electric current.

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Electrolytic detector

The electrolytic detector, or liquid barretter, was a type of detector (demodulator) used in early radio receivers. Crystal radio and electrolytic detector are radio electronics.

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Electromagnet

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

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Envelope detector

An envelope detector (sometimes called a peak detector) is an electronic circuit that takes a (relatively) high-frequency signal as input and outputs the envelope of the original signal.

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Fad

A fad, trend, or craze is any form of collective behavior that develops within a culture, a generation or social group in which a group of people enthusiastically follow an impulse for a short time period.

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Ferrite core

In electronics, a ferrite core is a type of magnetic core made of ferrite on which the windings of electric transformers and other wound components such as inductors are formed.

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Fire escape

A fire escape is a special kind of emergency exit, usually mounted to the outside of a building—occasionally inside, but separate from the main areas of the building.

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Folklore

Folklore is the body of expressive culture shared by a particular group of people, culture or subculture.

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Foxhole radio

A foxhole radio is a makeshift radio that was built by soldiers in World War II for entertainment, to listen to local radio stations using amplitude modulation. Crystal radio and foxhole radio are types of radios.

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Frequency

Frequency (symbol f), most often measured in hertz (symbol: Hz), is the number of occurrences of a repeating event per unit of time.

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Frequency modulation

Frequency modulation (FM) is the encoding of information in a carrier wave by varying the instantaneous frequency of the wave.

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Galena

Galena, also called lead glance, is the natural mineral form of lead(II) sulfide (PbS). Crystal radio and Galena are history of radio technology.

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Greenleaf Whittier Pickard

Greenleaf Whittier Pickard (February 14, 1877, Portland, Maine – January 8, 1956, Newton, Massachusetts) was a United States radio researcher in the early days of wireless.

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Ground (electricity)

In electrical engineering, ground or earth may be a reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the Earth.

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Headphones

Headphones are a pair of small loudspeaker drivers worn on or around the head over a user's ears.

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Hearing

Hearing, or auditory perception, is the ability to perceive sounds through an organ, such as an ear, by detecting vibrations as periodic changes in the pressure of a surrounding medium.

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Henry Harrison Chase Dunwoody

Henry Harrison Chase Dunwoody (October 23, 1842 – January 1, 1933) was an American army officer, businessman, and inventor.

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High fidelity

High fidelity (often shortened to Hi-Fi or HiFi) is the high-quality reproduction of sound.

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History of radio

The early history of radio is the history of technology that produces and uses radio instruments that use radio waves.

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Hobby

A hobby is considered to be a regular activity that is done for enjoyment, typically during one's leisure time.

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Impedance matching

In electrical engineering, impedance matching is the practice of designing or adjusting the input impedance or output impedance of an electrical device for a desired value. Crystal radio and impedance matching are electronic design.

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Inductance

Inductance is the tendency of an electrical conductor to oppose a change in the electric current flowing through it.

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Inductor

An inductor, also called a coil, choke, or reactor, is a passive two-terminal electrical component that stores energy in a magnetic field when electric current flows through it.

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Input impedance

In electrical engineering, the input impedance of an electrical network is the measure of the opposition to current (impedance), both static (resistance) and dynamic (reactance), into a load network that is external to the electrical source network.

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Jagadish Chandra Bose

Sir Jagadish Chandra Bose (30 November 1858 – 23 November 1937) was a polymath with interests in biology, physics, botany and writing science fiction.

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Karl Ferdinand Braun

Karl Ferdinand Braun (6 June 1850 – 20 April 1918) was a German electrical engineer, inventor, physicist and Nobel laureate in physics.

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KDKA (AM)

KDKA is a Class A, clear channel, AM radio station, owned and operated by Audacy, Inc. and licensed to Pittsburgh, Pennsylvania, United States.

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LC circuit

An LC circuit, also called a resonant circuit, tank circuit, or tuned circuit, is an electric circuit consisting of an inductor, represented by the letter L, and a capacitor, represented by the letter C, connected together. Crystal radio and lC circuit are history of radio technology.

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Local oscillator

In electronics, a local oscillator (LO) is an electronic oscillator used with a mixer to change the frequency of a signal. Crystal radio and local oscillator are radio electronics.

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Loop antenna

A loop antenna is a radio antenna consisting of a loop or coil of wire, tubing, or other electrical conductor, that for transmitting is usually fed by a balanced power source or for receiving feeds a balanced load.

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Loudspeaker

A loudspeaker (commonly referred to as a speaker or speaker driver) is an electroacoustic transducer that converts an electrical audio signal into a corresponding sound.

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Louis Winslow Austin

Louis Winslow Austin (October 30, 1867 – June 27, 1932) was an American physicist known for his research on long-range radio transmissions.

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Low-pass filter

A low-pass filter is a filter that passes signals with a frequency lower than a selected cutoff frequency and attenuates signals with frequencies higher than the cutoff frequency.

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Magnet

A magnet is a material or object that produces a magnetic field.

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Magnetic core

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, loudspeakers, magnetic recording heads, and magnetic assemblies. Crystal radio and magnetic core are radio electronics.

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Magnetic coupling

A magnetic coupling is a component which transfers torque from one shaft to another using a magnetic field, rather than a physical mechanical connection.

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Magnetic field

A magnetic field (sometimes called B-field) is a physical field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials.

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Mains electricity

Mains electricity or utility power, grid power, domestic power, and wall power, or, in some parts of Canada, hydro, is a general-purpose alternating-current (AC) electric power supply.

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Medium wave

Medium wave (MW) is a part of the medium frequency (MF) radio band used mainly for AM radio broadcasting.

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A metal is a material that, when polished or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well.

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Mineral

In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.

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Modulation

In electronics and telecommunications, modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a separate signal called the modulation signal that typically contains information to be transmitted.

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Molybdenite

Molybdenite is a mineral of molybdenum disulfide, MoS2.

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Monopole antenna

A monopole antenna is a class of radio antenna consisting of a straight rod-shaped conductor, often mounted perpendicularly over some type of conductive surface, called a ground plane.

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Morse code

Morse code is a telecommunications method which encodes text characters as standardized sequences of two different signal durations, called dots and dashes, or dits and dahs.

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Moving iron speaker

Moving iron speaker Moving iron sounder The moving iron speaker was the earliest type of electric loudspeaker.

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National Institute of Standards and Technology

The National Institute of Standards and Technology (NIST) is an agency of the United States Department of Commerce whose mission is to promote American innovation and industrial competitiveness.

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Negative resistance

In electronics, negative resistance (NR) is a property of some electrical circuits and devices in which an increase in voltage across the device's terminals results in a decrease in electric current through it.

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Ohm

The ohm (symbol: Ω, the uppercase Greek letter omega) is the unit of electrical resistance in the International System of Units (SI).

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Oleg Losev

Oleg Vladimirovich Losev (sometimes spelled Lossev or Lossew in English; Оле́г Влади́мирович Ло́сев; 10 May 1903 – 22 January 1942) was a Russian and Soviet scientist and inventor An English translation is on the Springer archive who made significant discoveries in the field of semiconductor junctions and the light emitting diode (LED).

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Parasitic capacitance

Parasitic capacitance or stray capacitance is the unavoidable and usually unwanted capacitance that exists between the parts of an electronic component or circuit simply because of their proximity to each other.

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Passivity (engineering)

Passivity is a property of engineering systems, most commonly encountered in analog electronics and control systems.

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Pencil

A pencil is a writing or drawing implement with a solid pigment core in a protective casing that reduces the risk of core breakage and keeps it from marking the user's hand.

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Permeability (electromagnetism)

In electromagnetism, permeability is the measure of magnetization produced in a material in response to an applied magnetic field.

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Piezoelectricity

Piezoelectricity is the electric charge that accumulates in certain solid materials—such as crystals, certain ceramics, and biological matter such as bone, DNA, and various proteins—in response to applied mechanical stress.

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Pittsburgh

Pittsburgh is a city in and the county seat of Allegheny County, Pennsylvania, United States.

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Popular Electronics

Popular Electronics was an American magazine published by John August Media, LLC, and hosted at TechnicaCuriosa.com.

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Potentiometer

A potentiometer is a three-terminal resistor with a sliding or rotating contact that forms an adjustable voltage divider.

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Presidencies and provinces of British India

The provinces of India, earlier presidencies of British India and still earlier, presidency towns, were the administrative divisions of British governance on the Indian subcontinent.

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Psilomelane

Psilomelane is a group name for hard black manganese oxides including hollandite and romanechite.

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Pyrite

The mineral pyrite, or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula FeS2 (iron (II) disulfide).

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Q factor

In physics and engineering, the quality factor or Q factor is a dimensionless parameter that describes how underdamped an oscillator or resonator is.

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QST

QST is a magazine for amateur radio enthusiasts, published by the American Radio Relay League (ARRL).

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Rack and pinion

A rack and pinion is a type of linear actuator that comprises a circular gear (the pinion) engaging a linear gear (the rack).

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Radio broadcasting

Radio broadcasting is the broadcasting of audio (sound), sometimes with related metadata, by radio waves to radio receivers belonging to a public audience.

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Radio frequency

Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around to around.

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Radio receiver

In radio communications, a radio receiver, also known as a receiver, a wireless, or simply a radio, is an electronic device that receives radio waves and converts the information carried by them to a usable form. Crystal radio and radio receiver are receiver (radio).

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Radio wave

Radio waves are a type of electromagnetic radiation with the lowest frequencies and the longest wavelengths in the electromagnetic spectrum, typically with frequencies below 300 gigahertz (GHz) and wavelengths greater than, about the diameter of a grain of rice.

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Radiotelephone

A radiotelephone (or radiophone), abbreviated RT, is a radio communication system for conducting a conversation; radiotelephony means telephony by radio.

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Random wire antenna

A random wire antenna is a radio antenna consisting of a long wire suspended above the ground, whose length does not bear a particular relation to the wavelength of the radio waves used, but is typically chosen more for convenient fit between the available supports, or the length of wire at hand, rather than selecting length to be resonant on any particular frequency.

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Razor

A razor is a bladed tool primarily used in the removal of body hair through the act of shaving.

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Razor blade steel

Razor blade steel, also known as razor steel, is a special type of stainless steel designed specifically to be used as a razor blade.

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Rectifier

A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction.

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Resonance

In physics, resonance refers to a wide class of phenomena that arise as a result of matching temporal or spatial periods of oscillatory objects.

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Resonator

A resonator is a device or system that exhibits resonance or resonant behavior.

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Russia

Russia, or the Russian Federation, is a country spanning Eastern Europe and North Asia.

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Schottky diode

The Schottky diode (named after the German physicist Walter H. Schottky), also known as Schottky barrier diode or hot-carrier diode, is a semiconductor diode formed by the junction of a semiconductor with a metal.

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Scout (Scouting)

A Scout (in some countries a Boy Scout, Girl Scout, or Pathfinder) is a child, usually 10–18 years of age, participating in the worldwide Scouting movement.

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SCR-54

The SCR-54 was a tunable, portable crystal radio receiver used by the U. S. Army during World War I for fire control in conjunction with airplanes.

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Selectivity (radio)

Selectivity is a measure of the performance of a radio receiver to respond only to the radio signal it is tuned to (such as a radio station) and reject other signals nearby in frequency, such as another broadcast on an adjacent channel.

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Semiconductor

A semiconductor is a material that has an electrical conductivity value falling between that of a conductor, such as copper, and an insulator, such as glass.

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Shortwave radio

Shortwave radio is radio transmission using radio frequencies in the shortwave bands (SW).

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Silicon

Silicon is a chemical element; it has symbol Si and atomic number 14.

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Silicon carbide

Silicon carbide (SiC), also known as carborundum, is a hard chemical compound containing silicon and carbon.

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Spark-gap transmitter

A spark-gap transmitter is an obsolete type of radio transmitter which generates radio waves by means of an electric spark. Crystal radio and spark-gap transmitter are history of radio technology and radio electronics.

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Square-law detector

In electronic signal processing, a square law detector is a device that produces an output proportional to the square of some input.

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Strasbourg

Strasbourg (Straßburg) is the prefecture and largest city of the Grand Est region of eastern France, at the border with Germany in the historic region of Alsace.

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Superheterodyne receiver

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. Crystal radio and superheterodyne receiver are electronic design, history of radio technology, radio electronics and receiver (radio).

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T-antenna

A ‘T’-antenna, ‘T’-aerial, or flat-top antenna is a monopole radio antenna consisting of one or more horizontal wires suspended between two supporting radio masts or buildings and insulated from them at the ends.

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Transformer

In electrical engineering, a transformer is a passive component that transfers electrical energy from one electrical circuit to another circuit, or multiple circuits.

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Transistor

A transistor is a semiconductor device used to amplify or switch electrical signals and power.

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Transistor radio

A transistor radio is a small portable radio receiver that uses transistor-based circuitry. Crystal radio and transistor radio are history of radio technology, radio electronics, receiver (radio) and types of radios.

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Transmitter

In electronics and telecommunications, a radio transmitter or just transmitter (often abbreviated as XMTR or TX in technical documents) is an electronic device which produces radio waves with an antenna with the purpose of signal transmission up to a radio receiver.

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References

[1] https://en.wikipedia.org/wiki/Crystal_radio

Also known as Crystadine, Crystal radio receiver, Crystal receiver, Crystal set, Crystal sets, Crystodine.

, Folklore, Foxhole radio, Frequency, Frequency modulation, Galena, Greenleaf Whittier Pickard, Ground (electricity), Headphones, Hearing, Henry Harrison Chase Dunwoody, High fidelity, History of radio, Hobby, Impedance matching, Inductance, Inductor, Input impedance, Jagadish Chandra Bose, Karl Ferdinand Braun, KDKA (AM), LC circuit, Local oscillator, Loop antenna, Loudspeaker, Louis Winslow Austin, Low-pass filter, Magnet, Magnetic core, Magnetic coupling, Magnetic field, Mains electricity, Medium wave, Metal, Mineral, Modulation, Molybdenite, Monopole antenna, Morse code, Moving iron speaker, National Institute of Standards and Technology, Negative resistance, Ohm, Oleg Losev, Parasitic capacitance, Passivity (engineering), Pencil, Permeability (electromagnetism), Piezoelectricity, Pittsburgh, Popular Electronics, Potentiometer, Presidencies and provinces of British India, Psilomelane, Pyrite, Q factor, QST, Rack and pinion, Radio broadcasting, Radio frequency, Radio receiver, Radio wave, Radiotelephone, Random wire antenna, Razor, Razor blade steel, Rectifier, Resonance, Resonator, Russia, Schottky diode, Scout (Scouting), SCR-54, Selectivity (radio), Semiconductor, Shortwave radio, Silicon, Silicon carbide, Spark-gap transmitter, Square-law detector, Strasbourg, Superheterodyne receiver, T-antenna, Transformer, Transistor, Transistor radio, Transmitter, Tunnel diode, United States Department of Commerce, Vacuum tube, Variable capacitor, Watt, Wave impedance, Wavelength, Westinghouse Electric Corporation, Whip antenna, Wireless telegraphy, World War II, Zinc oxide, Zincite, 1920 United States presidential election.

Crystal radio, the Glossary

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