26 relations: Amateur radio, Antenna tuner, Balun, Coaxial cable, Continuous wave, Dipole antenna, Directional antenna, Dowel, Electrical impedance, Electrical reactance, Electromagnetic interference, Frequency band, Impedance matching, Jack Belrose, Ohm, Omnidirectional antenna, PSK31, San Diego, Shortwave broadband antenna, Shortwave listening, Shortwave radio, Standing wave ratio, United States Navy, Watt, Wavelength, World War II.
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.
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.
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).
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.
A continuous wave or continuous waveform (CW) is an electromagnetic wave of constant amplitude and frequency, almost always a sine wave, that for mathematical analysis is considered to be of infinite duration.
In radio and telecommunications a dipole antenna or doublet is the simplest and most widely used class of antenna.
A directional antenna or beam antenna is an antenna which radiates or receives greater power in specific directions allowing increased performance and reduced interference from unwanted sources.
A dowel is a cylindrical rod, usually made from wood, plastic, or metal.
Electrical impedance is the measure of the opposition that a circuit presents to a current when a voltage is applied.
In electrical and electronic systems, reactance is the opposition of a circuit element to a change in current or voltage, due to that element's inductance or capacitance.
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.
A frequency band is an interval in the frequency domain, delimited by a lower frequency and an upper frequency.
In electronics, impedance matching is the practice of designing the input impedance of an electrical load or the output impedance of its corresponding signal source to maximize the power transfer or minimize signal reflection from the load.
John S. (Jack) Belrose (born 24 November 1926), is a Canadian radio scientist He was born in the small town of Warner, Alberta.
The ohm (symbol: Ω) is the SI derived unit of electrical resistance, named after German physicist Georg Simon Ohm.
In radio communication, an omnidirectional antenna is a class of antenna which have an axis about which radio wave power is radiated symmetrically, and, upon that axis, is zero.
PSK31 or "Phase Shift Keying, 31 Baud", also BPSK31 and QPSK31, is a popular computer-sound card-generated radioteletype mode, used primarily by amateur radio operators to conduct real-time keyboard-to-keyboard chat, most often using frequencies in the high frequency amateur radio bands (near-shortwave).
San Diego (Spanish for 'Saint Didacus') is a major city in California, United States.
A shortwave broadband antenna is a radio antenna, that without adjustment, can be used for transmission (and reception) of a shortwave radio channel chosen from greater part of the shortwave radio spectrum.
Shortwave listening, or SWLing, is the hobby of listening to shortwave radio broadcasts located on frequencies between 1700 kHz and 30 MHz.
Shortwave radio is radio transmission using shortwave radio frequencies.
In radio engineering and telecommunications, standing wave ratio (SWR) is a measure of impedance matching of loads to the characteristic impedance of a transmission line or waveguide.
The United States Navy (USN) is the naval warfare service branch of the United States Armed Forces and one of the seven uniformed services of the United States.
The watt (symbol: W) is a unit of power.
In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
World War II (often abbreviated to WWII or WW2), also known as the Second World War, was a global war that lasted from 1939 to 1945, although conflicts reflecting the ideological clash between what would become the Allied and Axis blocs began earlier.