Radio spectrum
The radio spectrum is the part of the electromagnetic spectrum from 8.3 kHz to 3000 GHz allocated to some 40 Radiocommunication services in line to the Radio Regulations (RR) of the Internat...
Roofing filter
A roofing filter is a type of filter used in a HF radio receiver. It is usually found after the first receiver mixer. The goal of a roofing filter is to limit the passband of the first intermediate fr...
Antenna tuner
An antenna tuner, transmatch, or antenna tuning unit (ATU), or antenna coupler is a device connected between a radio transmitter or receiver and its antenna to improve power transfer between them by m...
Antenna tuner - Wikipedia
Transition band
The transition band, also called the skirt, is a range of frequencies, that allows a transition between a passband and a stopband of a signal processing filter. The transition band is defined by a pas...
All-pass filter
An all-pass filter is a signal processing filter that passes all frequencies equally in gain, but changes the phase relationship between various frequencies. It does this by varying its phase shift as...
Tuned radio frequency receiver
A tuned radio frequency receiver (or TRF receiver) is a type of radio receiver that is composed of one or more tuned radio frequency (RF) amplifier stages followed by a detector (demodulator) circuit...
Tuned radio frequency receiver - Wikipedia
Guard band
In radio, a guard band is an unused part of the radio spectrum between radio bands, for the purpose of preventing interference.It is a narrow frequency range used to separate two wider frequency range...
Guard band - Wikipedia
High-pass filter
A high-pass filter 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. The amou...
High-pass filter - Wikipedia
Choke (electronics)
In electronics, a choke is an inductor used to block higher-frequency alternating current (AC) in an electrical circuit, while passing lower-frequency or direct current (DC). A choke usually consists ...
Choke (electronics) - Wikipedia
Ferrite bead
A ferrite bead is a passive electric component that suppresses high frequency noise in electronic circuits. It is a specific type of electronic choke. Ferrite beads employ the dissipation of high freq...
Ferrite bead - Wikipedia
Phase noise
In signal processing, phase noise is the frequency domain representation of rapid, short-term, random fluctuations in the phase of a waveform, caused by time domain instabilities ("jitter"). Generall...
Spurious emission
A spurious emission is any radio frequency not deliberately created or transmitted, especially in a device which normally does create other frequencies. A harmonic or other signal outside a transmitt...
Crystal filter
A crystal filter is an electronic filter that uses quartz crystals for resonators. Quartz crystals are piezoelectric, so their mechanical characteristics can affect electronic circuits. (see mechanica...
Passband
A passband is the range of frequencies or wavelengths that can pass through a filter.A bandpass-filtered signal (that is, a signal with energy only in a passband), is known as a bandpass signal contra...
Passband - Wikipedia
MPX filter
MPX filter is a function found in cassette decks.FM stereo broadcasts contain a pilot tone at 19 kHz when stereo information is available at higher frequencies. This system was developed jointly by Ze...
800 MHz frequency band
The 800 MHz frequency band is a portion of the electromagnetic spectrum, or frequency band, that encompasses 790–862 MHz.Being a part of the spectrum known as "UHF Bands IV and V" (i.e. 470M...
Roll-off
Roll-off is the steepness of a transmission function with frequency, particularly in electrical network analysis, and most especially in connection with filter circuits in the transition between a pas...
Roll-off - Wikipedia
YIG sphere
Yttrium iron garnet spheres (YIG spheres) serve as magnetically tunable filters and resonators for microwave frequencies. These filters are used for their high Q factors. A sphere made from a single ...
Luxemburg–Gorky effect
In radiophysics, the Luxemburg–Gorky effect is a phenomenon of cross modulation between two radio waves, one of which is strong, passing through the same part of a medium, especially a conductive regi...
Spectrum commons theory
The Spectrum Commons theory states that the telecommunication radio spectrum should be directly managed by its users rather than regulated by governmental or private institutions. Spectrum management ...
Spectrum commons theory - Wikipedia
Tuned filter
In signal processing, a tuned filter is a stage in the processing channel which accepts or rejects signals which are tuned for a specific type.
Historically, the concept of tuning was to maintain ...
Band-pass filter
A band-pass filter is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range.
An example of an analogue electronic band-pass filter is an R...
Line filter
A line filter is the kind of electronic filter that is placed between an electronic equipment and a line external to it, to attenuate conducted radio frequencies -- RFI, also known as electromagnetic ...
Line filter - Wikipedia
Tuner (radio)
A tuner is a subsystem that receives radio frequency (RF) transmissions like radio broadcasts and converts the selected carrier frequency and its associated bandwidth into a fixed frequency that is su...
Personal RF safety monitors
Electromagnetic field dosimeters measure the exposure to electromagnetic radiation in certain ranges of theelectromagnetic spectrum. This article concentrates on dosimeters used in the telecommunicati...
Personal RF safety monitors - Wikipedia
Shortwave radio
Shortwave radio is radio transmission using shortwave frequencies, generally 1.6–30 MHz, just above the medium wave band.Shortwave radio is used for long distance communication by means of skywav...
Shortwave radio - Wikipedia
Terahertz radiation
In physics, terahertz radiation – also known as submillimeter radiation, terahertz waves, tremendously high frequency, T-rays, T-waves, T-light, T-lux or THz – consists of electromagnetic wa...
Terahertz radiation - Wikipedia
Bode plot
In electrical engineering and control theory, a Bode plot /ˈboʊdi/ is a graph of the frequency response of a system. It is usually a combination of a Bode magnitude plot, expressing the magnitude of ...
Bode plot - Wikipedia