Radio Electronics
34 entries in the Radio Electronics compendium.
Radio electronicsElectronic circuits designed to receive or transmit radio signals.2.4 GHz radio useA shared radio band used by many wireless technologies, prone to interference.Absorption wavemeterSimple resonant instrument for measuring radio wave frequency.Alexanderson alternatorRotating machine generating continuous radio waves for longwave communication.Impedance analyzerMeasures complex electrical impedance as a function of test frequency.Antique radioCollectible radio receivers valued for age and rarity.Arc converterEarly continuous-wave radio transmitter using an electric arc.BalunAn electrical device interfacing balanced and unbalanced lines.Morris BeitmanPublisher of condensed radio and television servicing manuals.Cavity perturbation theoryAnalytical method for resonant frequency and Q factor changes.Cellular repeaterA bi-directional amplifier that improves cell phone reception indoors or in vehicles.CohererEarly radio detector using metal filings that cohered under radio signals.Counterpoise (ground system)A suspended wire network substituting for an earth ground in antenna systems.Powel Crosley Jr.Inventor, industrialist, and radio broadcasting pioneer.Crystal detectorEarly semiconductor diode used to demodulate radio signals in crystal radios.Crystal radioA passive radio receiver powered solely by received radio waves.DiplexerA passive device that frequency-multiplexes two ports onto one.Direct-conversion receiverA single-conversion receiver that demodulates by synchronous detection at the carrier frequency.DirectivityMeasure of concentration of radiated power in a single direction.Distributed-element circuitCircuits using transmission lines to replace lumped components at microwave frequencies.Edwin Howard ArmstrongAmerican inventor of FM radio and the superheterodyne receiver.Dummy loadA device that simulates an electrical load for testing without radiation or sound.DYNASDynamic analog filtering and tuning for improved FM reception.Electrolytic detectorEarly rectifying detector used to demodulate AM radio signals.Electromagnetic shieldingBarriers of conductive or magnetic material reduce or redirect electromagnetic fields.Federal Telegraph CompanyPioneering arc transmitters and early vacuum tube development.Feed lineThe cable connecting antenna to transmitter or receiver.Frequency mixerA circuit that produces sum and difference frequencies from two inputs.Luftwaffe and Kriegsmarine radar equipment of World War IIGerman WWII radar directed flak, searchlights, and fighters with increasing sophistication.Wireless Communications of the German Army in World War IIGerman Army FuG radios enabled coordinated armoured and infantry communications.Ghosting (television)A ghost is a replica of the transmitted image, offset in position.Gilbert cellBalanced mixer providing accurate multiplication of differential input currents.GoTennaMesh networking devices for off-grid peer-to-peer communication.Grid-leak detectorDemodulates and amplifies AM signals using a vacuum tube.
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