Radio Terms And Abbreviations > 자유게시판

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A receiver circuit that generates a alternative service to enable intelligible reception of CW, FSK, and SSB indicators. In FSK, the decrease of the two frequencies used. The space between the identical factors on two consecutive radio waves. An antenna that radiates, or receives finest, radio waves having their electric area perpendicular to the Earths surface. The frequency on which a radio transmission takes place, or the input and output frequency pair utilized by a repeater station. What are transmission strains used for? The physical location from which a radio stations functions (setting frequency, turning the station off and on, and so on.) are controlled. A method of limiting access to a repeater station to stations that start their transmission with a particular sequence of tones. The short transmission traces are shorter than 50 km, medium transmission strains range from 50 to 150 km and long transmission strains are longer than a hundred and fifty km. UHF-T: The frequency vary from 470 to 512 MHz. MUF: Abbreviation for optimum usable frequency, the highest frequency that can support propagation between two factors.

You can return to the top of this web page by clicking Top at the tip of every part of definitions. If a definition comprises an italicized phrase, that phrase is also outlined on this page. Transmission traces carry either AC, DC, or each mixtures but the vast majority of transmission traces all over the world carry energy AC kind. The line constants of this sort of transmission line like resistance, capacitance, inductance & conductance are distributed above the whole length of the road uniformly. A transmission line with greater than 250 km of bodily length is named an extended line. The bodily size of the transmission line which has less than 80km is called a brief transmission line. The essential properties of transmission traces that determine their essential efficiency primarily embrace inductance, capacitance, resistance, and conductance. The primary impact of the D-layer on radio propagation is to absorb power from indicators passing by it. The primary influence of the E-layer on radio propagation is to absorb energy from signals passing through it, although sporadic-E propagation makes possible distant communications on frequencies above 30 MHz. UHF low: The frequency range from 450 to 470 MHz. The frequency vary from 300 to 3000 MHz.

Propagation of signals above 30 MHz through refraction by highly ionized regions around the Earths poles. Thus, this is an overview of transmission traces which can be extensively used for transmitting excessive-frequency indicators above short or long distances with less power loss. The voltage vary of this transmission line is below 69 kV and the capacitance effect in this transmission line shall be negligible by taking inductance & resistance only in calculation. The decrease the angle, the higher distance the radio sign will travel through ionospheric refraction. A radio signal propagated via line of sight. The most significant bodily property of the road is the characteristic impedance (Z0). The characteristic impedance importance in the RF design context lies in the fact that the designer has to match impedances to avoid reflections & attain the very best power transfer. A system put in between a receiver or transmitter and the antenna to match the radio impedance to the antenna impedance for maximum power switch. DXpedition: An organized effort by ham radio operators to place a rare location on the air, or a visit by shortwave listeners to a site for favorable DX reception.

QTH: Radiotelegraph abbreviation for a stations location. An agreed-upon frequency the place stations try and contact one another; once contact is made, stations transfer to a working frequency. When strong indicators in a frequency range interfere with correct operation of a receiver, creating false "ghost alerts" on various frequencies within the frequency vary. A tuning technique in transmitters and receivers which makes use of a few piezoelectric crystals to generate a variety of frequencies. A filter that uses a network of piezoelectric crystals to obtain high rejection of undesirable indicators. AMTOR: Acronym for "amateur teleprinting over radio," a mode that makes use of FSK to send messages containing error detection capabilities and the power request retransmission of lacking or corrupted knowledge. In AMTOR, an ARQ is sent back to the transmitting station by the receiving station to request retransmission of lacking or corrupted parts. ARQ: Abbreviation for automated repeat request. AGC: Abbreviation for computerized acquire control.

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