통신용어, 약어

원본 출처 : http://www.dxing.com/radterms.htm

라디오 및 무선과 관련된 약어, 용어에 대한 설명입니다. 더 많은 내용은 출처의 홈페이지에서 찾을 수 있습니다.

AM : amplitude modulation

amplitude modulation: A modulation technique that varies the power output of a transmitter in accordance with the variations in the modulating audio signal.

amplitude : (dictionary) half of the total height of a wave such as a sound wave or an electrical wave, used as a measurement of how strong it is. The amplitude of a sea wave is its height above the level of water when the water is calm and still.

amplification: The process of increasing the strength of a radio signal.

antenna tuning unit: A device installed between a receiver or transmitter and the antenna to match the radio impedance to the antenna impedance for maximum power transfer.

impedance : (dictionary) (physics) a material's opposition to the flow of electric current; measured in ohms

automatic gain control: A receiver circuit that adjust the amount of amplification given to a received signal so that the volume from the speaker stays relatively constant.

bandpass: The frequency range that a receiver is currently tuning or that a filter permits to pass through it.

band pass filter: A filter that allows a certain range of frequencies to pass but which will reject frequencies below and above the desired range.

bandwidth: The amount of frequency space occupied by a radio signal.

beacon: A station making one-way transmissions for navigation, homing, and propagation indication purposes.

carrier: The unmodulated output of a radio transmitter.

center frequency: The unmodulated carrier frequency of a FM transmitter.

channel: The frequency on which a radio transmission takes place, or the input and output frequency pair used by a repeater station.

dummy load: A device used in transmitter testing and adjustment that dissipates the transmitter’s energy without radiating it.

duplex: To transmit on one frequency while listening for replies on another.

DX: Any station that is hard to hear or contact on a particular frequency, or is rarely heard or contacted on a particular frequency. "DX" is the old telegraph abbreviation for "distant."

filter: A circuit or device that will allow certain frequencies to pass while rejecting others.

FM: Abbreviation for frequency modulation.

frequency modulation: A modulation technique that varies the carrier frequency of a transmitter in accordance with the variations in the strength of the modulating audio signal.

frequency shift keying: A mode that shifts the station’s carrier between two fixed frequencies to form characters.

frequency synthesis: A tuning method in transmitters and receivers which uses a few piezoelectric crystals to generate a wide range of frequencies.

gain: The apparent increase in the strength of a signal radiated or received by an antenna caused by the antenna having better performance in some directions than others.

gateway: A node that is a part of more than one network and can be used to pass messages between those networks.

impedance: The opposition to the flow of electric current and radio energy; it is measured in ohms (W). For best performance, the impedance of an antenna, the feedline, and the antenna connector on a radio should be approximately equal.

line of sight: Communication between two radio stations that are in visual sight (even if telescopically) with each other.

modulation: The process of altering the output carrier of a transmitter in some way in order to convey information.

pass: The period during which signals from an orbiting satellite can be heard at a ground location.

passband tuning: A receiver circuit that permits adjusting the bandpass for best reception under different interference conditions

propagation: The process of how a radio signal travels from a transmitting station to a receiving station.

repeater: A radio station that receives stations on a certain frequency and simultaneously retransmits them on another frequency.

RX : (wiki) the telegraph and radio abbreviation for "receive", "receiver" or "reception".

RF gain: A control used to continuously vary the sensitivity of a receiver.