Radio Electronics, Part 3
22 entries in the Radio Electronics, Part 3 compendium.
Radio transmitter designDesign of circuits that generate and modulate radio waves for communication.Radio-frequency inductionEnergy transfer via radio frequency magnetic field in the near field.Radiogram (device)Furniture combining radio and record player, popular post-war.Reflex receiverA single amplifier amplifies both RF and audio signals.Regenerative circuitPositive feedback amplifier circuit used to greatly increase gain.RepeaterA device that receives and retransmits a signal to extend range.Return lossReturn loss quantifies signal reflection at impedance mismatches.RF chainCascade of RF components for signal processing from 100 kHz to 20 GHz.RF front endCircuitry between antenna and mixer in a superheterodyne receiver.RF power amplifierConverts low-power RF signals into higher-power signals for transmission.RF probeDevice for measuring RF signals in electronic circuits.Rolling codeA rolling code changes each use to thwart replay attacks.Roofing filterLimits early IF passband to prevent overload distortion.Short-range deviceLicense-free low-power transmitters for short-range wireless communication.Signal reflectionImpedance mismatches cause signal echoes that degrade transmission quality.Slotted lineA precision transmission line with a movable probe for microwave measurements.Spark-gap transmitterThe first type of radio transmitter, using electric sparks to generate waves.Spiral antennaSpiral antennas provide broadband, circularly polarized performance in a compact form.SquelchSquelch suppresses receiver output when no signal is present.Standing wave ratioSWR measures impedance matching via standing wave amplitude ratio.Stub (electronics)A transmission line stub provides reactive impedance for RF circuits.Harmonic mixerA mixer using harmonic multiples to simplify high-frequency signal conversion.
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