Radio Terms And Abbreviations > 자유게시판

The sideband decrease in frequency than the transmitters provider. A reception method the place the service produced by a receivers BFO circuit or product detector is used to change the carrier of an AM signal for higher reception. DXpedition: An organized effort by ham radio operators to put a rare location on the air, or a trip by shortwave listeners to a site for favorable DX reception. A receiver circuit consisting of a beat frequency oscillator and extra circuitry for enhanced reception of SSB signals. Yagi: A directional antenna consisting of a dipole related to the receiver or transmitter and two additional elements, a slightly longer reflector and a slightly shorter director. A directional antenna consisting of two one-wavelength "squares" of wire positioned a quarter-wavelength apart. In FSK, the upper of the 2 frequencies used. A filter that rejects all frequencies above a certain point but which allows all lower frequencies to cross.

A filter that rejects all frequencies beneath a sure level however which permits all larger frequencies to go. An antenna appropriate for operation on only one band of frequencies. Radio signals from 300 to 3000 kHz, although this term is often used to imply any radio signal in the AM broadcast band (540 to 1700 kHz). Radio alerts 300 kHz and decrease in frequency, although this term is usually used to imply any radio signal decrease than 540 kHz. GMT: Abbreviation for Greenwich mean time. SWR: Abbreviation for standing wave ratio. The ratio between two power ranges on a logarithmic scale. A excessive pitched "whistle" sound brought on by two carriers interfering with one another. The pitch of the "whistle" will depend on the frequency difference between the carriers. A gadget that receives multiple signals inside a sure frequency range and concurrently retransmits them in one other frequency vary. A frequency that is an integer multiple (two occasions, 3 times, and so on.) of a decrease frequency. LUF: Abbreviation for lowest usable frequency, the bottom frequency that can support propagation between two factors. MW: Abbreviation for megawatt. IRC: Abbreviation for International Reply Coupon. FSK: Abbreviation for frequency shift keying.

UHF low: The frequency range from 450 to 470 MHz. A tuning technique in transmitters and receivers which uses a number of piezoelectric crystals to generate a wide range of frequencies. A term used to describe receivers and transmitters protecting at the very least the frequency range of 500 kHz to 30 MHz and capable of operation in a number of completely different modes, including AM, CW, and SSB. DXCC: Abbreviation for "DX Century Club," an award given by the ARRL to hams who contact different hams in no less than 100 totally different countries. FEC: Abbreviation for forward error correction, a FSK mode that transmits each character twice to avoid errors. A mode that shifts the stations carrier between two mounted frequencies to kind characters. An antenna appropriate for operation on several completely different bands of frequencies. For best performance, the impedance of an antenna, the feedline, and the antenna connector on a radio must be approximately equal. An antenna that radiates, or receives greatest, radio waves having their electric discipline parallel to the Earths floor. The opposition to the movement of electric present and radio power; it's measured in ohms (W).

RST: A code used by ham radio operators to point a stations readability, signal energy, and tone of its Morse code alerts. Slang for a face-to-face assembly between two ham radio operators or radio hobbyists. Slang for the utmost transmitter power authorized for ham radio operators. The course of maximum radiation or received signal power for a directional antenna. S-meter: A meter or bargraph that signifies the relative power of a acquired sign. The obvious increase in the energy of a signal radiated or received by an antenna caused by the antenna having higher performance in some directions than others. An antenna that transmits and receives equally effectively in all instructions. The frequency at which an antenna radiates or receives with most efficiency. MUF: Abbreviation for max usable frequency, the best frequency that may support propagation between two factors. Hz: Abbreviation for kilohertz. Unit equal to 1,000,000 hertz or one thousand kilohertz. Unit equal to 1000 hertz. Unit equal to 1,000,000 watts of transmitter energy.

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