Radio Electronics, Part 2
39 entries in the Radio Electronics, Part 2 compendium.
Hot-wire barretterEarly thermoresistive detector for amplitude-modulated signals.Image responseMeasure of a superheterodyne receiver's ability to reject the image frequency.In-phase and quadrature componentsTwo orthogonal sinusoids that represent amplitude and phase modulation.Intermediate frequencyA fixed intermediate frequency enables selective filtering and stable amplification.IntermodulationUnwanted frequency components from nonlinear mixing of multiple signals.International Radio CorporationPioneering radio manufacturer that created the first AC/DC and clock radios.IQ imbalanceIQ imbalance corrupts quadrature signals in direct conversion receivers.Klotz DigitalGerman audio media manufacturer for broadcast and public address.Lecher lineParallel wires used to measure radio wavelength via standing waves.Load pullSystematic impedance variation for nonlinear device characterization and design.Local oscillatorLocal oscillators enable frequency conversion in superheterodyne receivers and many communications systems.Logic Trunked RadioTrunked radio system without a dedicated control channel.Low IF receiverA receiver topology avoiding DC offset and 1/f noise issues.Luftwaffe radio equipment of World War IIGerman Luftwaffe radio, IFF, and RDF equipment of World War II.Magic eye tubeA vacuum tube that visually indicates signal strength for tuning.Magnetic detectorEarly radio detector using iron hysteresis to receive Morse code.Mobile phone signalSignal strength displayed as bars varies with environment and network.Motorboating (electronics)Low-frequency parasitic oscillation causing a pulsing 'put-put-put' sound.NanoradioA carbon nanotube device that acts as a radio transmitter and receiver.Network analyzer (electrical)Measures network parameters, commonly s-parameters, for electrical networks.NeutrodyneA TRF receiver that neutralized tube capacitance to stop howling.Noise blankerA circuit that reduces impulse noise in radio receivers.Nyquist filterA receiver filter that equalizes video after VSB transmission.Orthomode transducerWaveguide component that separates or combines orthogonal microwave polarizations.Phase-locked loopA control system that locks output phase to input phase.Phase-locked loop rangeFrequency deviation intervals for PLL lock under varying conditions.Plasma antennaPlasma replaces metal in antennas for stealth and reconfigurability.PLL multibitMultibit PLL improves performance by using more counter bits.Power dividers and directional couplersPassive devices that couple defined electromagnetic power between transmission line ports.PredistortionPredistortion improves amplifier linearity by cancelling non-linear distortion.PreselectorAn adjustable band-pass filter that reduces interference before the receiver.Q meterMeasures the quality factor of radio frequency circuits.Q multiplierA regenerative circuit that sharpens receiver selectivity via positive feedback.Quasi-peak detectorA detector with defined dynamics used in EMC and audio measurement.Radiation efficiencyRatio of radiated power to accepted power, frequency dependent.Radio hatA pith helmet with a built-in AM radio, sold from coast to coast.Radio receiver designDesign of receivers balancing gain, selectivity, sensitivity, and stability.Radio repeaterA radio relay station that extends communication range over obstacles.Radio spectrum scopeMeasures signal magnitude versus frequency across radio bands.
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