37 relations: Amateur radio, Antenna (radio), Balanced line, Balun, Characteristic impedance, Coaxial cable, Copper, Dipole antenna, Do it yourself, Electric current, Electrical conductor, Electrical impedance, Electromagnetic interference, FM broadcasting, Impedance of free space, In-phase and quadrature components, Ladder, Near and far field, Ohm, Phase (waves), Polyethylene, Primary line constants, Radio frequency, Radio receiver, Radio wave, Rain gutter, Relative permittivity, RG-58, RG-6, Superposition principle, Television, Transmission line, Transmitter, Vacuum, Wavelength, Wire gauge, Yagi–Uda antenna.
Amateur radio, also known as ham radio, describes the use of radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, private recreation, radiosport, contesting, and emergency communication.
In radio, an antenna is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver.
In telecommunications and professional audio, a balanced line or balanced signal pair is a transmission line consisting of two conductors of the same type, each of which have equal impedances along their lengths and equal impedances to ground and to other circuits.
A balun (for balanced to unbalanced) is an electrical device that converts between a balanced signal (two signals working against each other where ground is irrelevant) and an unbalanced signal (a single signal working against ground or pseudo-ground).
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 single wave propagating along the line; that is, a wave travelling in one direction in the absence of reflections in the other direction.
Cross-sectional view of a coaxial cable Coaxial cable, or coax (pronounced), is a type of electrical cable that has an inner conductor surrounded by a tubular insulating layer, surrounded by a tubular conducting shield.
Copper is a chemical element with symbol Cu (from cuprum) and atomic number 29.
In radio and telecommunications a dipole antenna or doublet is the simplest and most widely used class of antenna.
"Do it yourself" ("DIY") is the method of building, modifying, or repairing things without the direct aid of experts or professionals.
An electric current is a flow of electric charge.
In physics and electrical engineering, a conductor is an object or type of material that allows the flow of an electrical current in one or more directions.
Electrical impedance is the measure of the opposition that a circuit presents to a current when a voltage is applied.
Electromagnetic interference (EMI), also called radio-frequency interference (RFI) when in the radio frequency spectrum, is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction.
FM broadcasting is a method of radio broadcasting using frequency modulation (FM) technology.
The impedance of free space,, is a physical constant relating the magnitudes of the electric and magnetic fields of electromagnetic radiation travelling through free space.
In electrical engineering, a sinusoid with angle modulation can be decomposed into, or synthesized from, two amplitude-modulated sinusoids that are offset in phase by one-quarter cycle (/2 radians).
A ladder is a vertical or inclined set of rungs or steps.
The near field and far field are regions of the electromagnetic field (EM) around an object, such as a transmitting antenna, or the result of radiation scattering off an object.
The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist Georg Simon Ohm.
Phase is the position of a point in time (an instant) on a waveform cycle.
Polyethylene or polythene (abbreviated PE; IUPAC name polyethene or poly(ethylene)) is the most common plastic.
The primary line constants are parameters that describe the characteristics of conductive transmission lines, such as pairs of copper wires, in terms of the physical electrical properties of the line.
Radio frequency (RF) refers to oscillatory change in voltage or current in a circuit, waveguide or transmission line in the range extending from around twenty thousand times per second to around three hundred billion times per second, roughly between the upper limit of audio and the lower limit of infrared.
In radio communications, a radio receiver (receiver or simply radio) is an electronic device that receives radio waves and converts the information carried by them to a usable form.
Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light.
A rain gutter or surface water collection channel is a component of water discharge system for a building.
The relative permittivity of a material is its (absolute) permittivity expressed as a ratio relative to the permittivity of vacuum.
RG-58/U is a type of coaxial cable often used for low-power signal and RF connections.
RG-6/U is a common type of coaxial cable used in a wide variety of residential and commercial applications.
In physics and systems theory, the superposition principle, also known as superposition property, states that, for all linear systems, the net response caused by two or more stimuli is the sum of the responses that would have been caused by each stimulus individually.
Television (TV) is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in colour, and in two or three dimensions and sound.
In communications and electronic engineering, a transmission line is a specialized cable or other structure designed to conduct alternating current of radio frequency, that is, currents with a frequency high enough that their wave nature must be taken into account.
In electronics and telecommunications, a transmitter or radio transmitter is an electronic device which produces radio waves with an antenna.
Vacuum is space devoid of matter.
In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
Wire gauge is a measurement of wire diameter.
A Yagi–Uda antenna, commonly known as a Yagi antenna, is a directional antenna consisting of multiple parallel elements in a line, usually half-wave dipoles made of metal rods.