Radio Terms And Abbreviations > 자유게시판

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The sideband decrease in frequency than the transmitters carrier. A reception method where the service produced by a receivers BFO circuit or product detector is used to replace the provider of an AM sign for higher reception. DXpedition: An organized effort by ham radio operators to put a rare location on the air, or a visit 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 indicators. Yagi: A directional antenna consisting of a dipole connected to the receiver or transmitter and two further elements, a slightly longer reflector and a slightly shorter director. A directional antenna consisting of two one-wavelength "squares" of wire placed a quarter-wavelength apart. In FSK, the upper of the 2 frequencies used. A filter that rejects all frequencies above a certain level however which permits all decrease frequencies to go.

A filter that rejects all frequencies under a sure level but which allows all larger frequencies to go. An antenna appropriate for operation on just one band of frequencies. Radio indicators from 300 to 3000 kHz, though this term is often used to imply any radio signal within the AM broadcast band (540 to 1700 kHz). Radio indicators 300 kHz and lower in frequency, although this time period is often used to imply any radio signal lower than 540 kHz. GMT: Abbreviation for Greenwich imply time. SWR: Abbreviation for standing wave ratio. The ratio between two power ranges on a logarithmic scale. A high pitched "whistle" sound attributable to two carriers interfering with one another. The pitch of the "whistle" relies on the frequency distinction between the carriers. A device that receives a number of alerts within a certain frequency range and concurrently retransmits them in one other frequency vary. A frequency that's an integer a number of (two instances, 3 times, and many others.) of a lower frequency. LUF: Abbreviation for lowest usable frequency, the bottom frequency that may help 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 makes use of just a few piezoelectric crystals to generate a variety of frequencies. A time period used to describe receivers and transmitters covering at least the frequency range of 500 kHz to 30 MHz and able to operation in several different modes, together with AM, CW, and SSB. DXCC: Abbreviation for "DX Century Club," an award given by the ARRL to hams who contact other hams in at least a hundred different nations. FEC: Abbreviation for forward error correction, a FSK mode that transmits every character twice to avoid errors. A mode that shifts the stations provider between two fastened frequencies to form characters. An antenna suitable for operation on a number of completely different bands of frequencies. For greatest performance, the impedance of an antenna, the feedline, and the antenna connector on a radio needs to be approximately equal. An antenna that radiates, or receives finest, radio waves having their electric area parallel to the Earths floor. The opposition to the move of electric present and radio vitality; it is measured in ohms (W).

RST: A code utilized by ham radio operators to point a stations readability, signal energy, and tone of its Morse code indicators. Slang for a face-to-face meeting between two ham radio operators or radio hobbyists. Slang for the maximum transmitter energy authorized for ham radio operators. The route of maximum radiation or obtained signal energy for a directional antenna. S-meter: A meter or bargraph that indicates the relative power of a obtained signal. The obvious enhance in the energy of a signal radiated or received by an antenna brought on by the antenna having higher performance in some directions than others. An antenna that transmits and receives equally properly in all instructions. The frequency at which an antenna radiates or receives with maximum effectivity. MUF: Abbreviation for optimum usable frequency, the best frequency that may assist propagation between two factors. Hz: Abbreviation for kilohertz. Unit equal to 1,000,000 hertz or one thousand kilohertz. Unit equal to a thousand hertz. Unit equal to 1,000,000 watts of transmitter energy.

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