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Preselector, the Glossary

A preselector is a name for an electronic device that connects between a radio antenna and a radio receiver.^[1]

42 relations: AM expanded band, American Radio Relay League, Amplitude distortion, Antenna (radio), Antenna tuner, Band-pass filter, Bandwidth (signal processing), Capacitor, Characteristic impedance, Clipping (audio), Clipping (signal processing), Continuous wave, Decibel, Dipole antenna, Dynamic range, Electric power quality, Electrical impedance, Electronics, High-pass filter, Inductor, Longwave, Low-pass filter, Medium wave, Passivity (engineering), Pi (letter), Preamplifier, Q factor, QST, Radio, Radio frequency, Radio noise, Radio receiver, Radio scanner, Random wire antenna, RF power amplifier, Shortwave radio, Software-defined radio, Static electricity, Transmission line, Vacuum tube, Wave interference, Wireless telegraphy.
Receiver (radio)
Wireless tuning and filtering

AM expanded band

The extended mediumwave broadcast band, commonly known as the AM expanded band, refers to the broadcast station frequency assignments immediately above the earlier upper limits of 1600 kHz in International Telecommunication Union (ITU) Region 2 (the Americas), and 1602 kHz in ITU Regions 1 (Europe, northern Asia and Africa) and 3 (southern Asia and Oceania).

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American Radio Relay League

The American Radio Relay League (ARRL) is the largest membership association of amateur radio enthusiasts in the United States.

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Amplitude distortion

Amplitude distortion is distortion occurring in a system, subsystem, or device when the output amplitude is not a linear function of the input amplitude under specified conditions.

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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. Preselector 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. Preselector and antenna tuner are wireless tuning and filtering.

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Band-pass filter

A band-pass filter or bandpass filter (BPF) is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range.

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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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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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Characteristic impedance

The characteristic impedance or surge impedance (usually written Z0) of a uniform transmission line is the ratio of the amplitudes of voltage and current of a wave travelling in one direction along the line in the absence of reflections in the other direction.

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Clipping (audio)

Clipping is a form of waveform distortion that occurs when an amplifier is overdriven and attempts to deliver an output voltage or current beyond its maximum capability.

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Clipping (signal processing)

Clipping is a form of distortion that limits a signal once it exceeds a threshold.

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Continuous wave

A continuous wave or continuous waveform (CW) is an electromagnetic wave of constant amplitude and frequency, typically a sine wave, that for mathematical analysis is considered to be of infinite duration.

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Decibel

The decibel (symbol: dB) is a relative unit of measurement equal to one tenth of a bel (B).

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Dipole antenna

In radio and telecommunications a dipole antenna or doublet is one of the two simplest and most widely-used types of antenna; the other is the monopole.

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Dynamic range

Dynamic range (abbreviated DR, DNR, or DYR) is the ratio between the largest and smallest values that a certain quantity can assume.

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Electric power quality

Electric power quality is the degree to which the voltage, frequency, and waveform of a power supply system conform to established specifications.

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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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Electronics

Electronics is a scientific and engineering discipline that studies and applies the principles of physics to design, create, and operate devices that manipulate electrons and other electrically charged particles.

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High-pass filter

A high-pass filter (HPF) is an electronic filter that passes signals with a frequency higher than a certain cutoff frequency and attenuates signals with frequencies lower than the cutoff frequency.

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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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Longwave

In radio, longwave, long wave or long-wave, and commonly abbreviated LW, refers to parts of the radio spectrum with wavelengths longer than what was originally called the medium-wave broadcasting band.

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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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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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Passivity (engineering)

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

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Pi (letter)

Pi (/ˈpaɪ/; Ancient Greek /piː/ or /peî/, uppercase Π, lowercase π, cursive ϖ; πι) is the sixteenth letter of the Greek alphabet, meaning units united, and representing the voiceless bilabial plosive.

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Preamplifier

A preamplifier, also known as a preamp, is an electronic amplifier that converts a weak electrical signal into an output signal strong enough to be noise-tolerant and strong enough for further processing, or for sending to a power amplifier and a loudspeaker.

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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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Radio

Radio is the technology of communicating using radio waves.

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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 noise

In radio reception, radio noise (commonly referred to as radio static) is unwanted random radio frequency electrical signals, fluctuating voltages, always present in a radio receiver in addition to the desired radio signal.

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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. Preselector and radio receiver are receiver (radio).

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Radio scanner

A scanner (also referred to as a radio scanner) is a radio receiver that can automatically tune, or scan, two or more discrete frequencies, stopping when it finds a signal on one of them and then continuing to scan other frequencies when the initial transmission ceases. Preselector and radio scanner are receiver (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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RF power amplifier

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

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Shortwave radio

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

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Software-defined radio

Software-defined radio (SDR) is a radio communication system where components that conventionally have been implemented in analog hardware (e.g. mixers, filters, amplifiers, modulators/demodulators, detectors, etc.) are instead implemented by means of software on a computer or embedded system. Preselector and software-defined radio are radio electronics and receiver (radio).

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References

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

Also known as Tuning coil.

Preselector, the Glossary

Table of Contents

See also

Receiver (radio)

Wireless tuning and filtering

References