Are You Really Doing Enough Medium Voltage Overhead Cable? > 자유게시판

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An agreed-upon frequency where stations try and contact each other; once contact is made, stations transfer to a working frequency. A frequency that two or more stations can use to communicate with each other. A transmission line with greater than 250 km of bodily size is called a protracted line. An outside antenna, usually mounted on a rotor, that concentrates more transmitter energy (or receives higher) in a certain direction. An antenna one half-wavelength long at the specified operation frequency that is divided into two quarter-wavelength sections; it transmits and receives in a figure-eight sample. The path of maximum radiation or acquired sign strength for a directional antenna. The frequency at or near the MUF at which the maximum sky wave propagation range is obtained. The frequency at which an antenna radiates or receives with most effectivity. A packet radio station that receives and retransmits packets intended for different stations.

A mode that shifts the stations carrier between two fastened frequencies to type characters. A modulation technique that varies the service frequency of a transmitter in accordance with the variations in the energy of the modulating audio sign. The change in the service frequency of a FM transmitter produced by the modulating signal. Changes within the provider frequency of a Morse code transmitter, often due to energy provide problems. A system of sending numbers via Morse code by substituting shorter letter characters for the longer number characters. The constant output of a radio transmitter that may be periodically interrupted to ship messages by Morse code. Undesired indicators and frequencies in the output of a transmitter. VHF: Abbreviation for very excessive frequencies. BCB: Abbreviation for the AM "broadcast band" working from 540 to 1700 kHz. Radio alerts 300 kHz and lower in frequency, although this term is commonly used to imply any radio signal lower than 540 kHz. Placing a loading coil at the top of an antenna to be able to decrease the antennas resonant frequency. Placing a loading coil at the middle of an antenna in an effort to lower the antennas resonant frequency. The lower the angle, the larger distance the radio signal will journey by means of ionospheric refraction.

ASCII: Acronym for "American normal code for data interchange," a method of representing higher and lower letters in addition to numbers and special symbols. ARRL: Acronym for "American Radio Relay League," the national affiliation for ham radio operators in the United States. AMTOR: Acronym for "newbie teleprinting over radio," a mode that makes use of FSK to ship messages containing error detection capabilities and the flexibility request retransmission of lacking or corrupted data. How properly a receiver can handle robust indicators with overloading; any measure of over a hundred decibels is considered wonderful. A 3 decibel increase is a doubling of power; a 20 decibel improve is a energy enhance of a hundred times. B: Abbreviation for decibel. AGC: Abbreviation for automated achieve control. Operation of a radio station with a human operator on the management point. OM: Abbreviation for "outdated man," an outdated radiotelegraph abbreviation for any radio operator (presumed to be male); now used to seek advice from any male radio operator or announcer.

Elmer: An skilled ham radio operator who mentors new hams and potential hams. A clearinghouse for QSL cards sent to and acquired from ham operators in other nations. DXpedition: An organized effort by ham radio operators to put a uncommon location on the air, or a trip by shortwave listeners to a site for favorable DX reception. QTH: Radiotelegraph abbreviation for a stations location. 1) When a station ends its operations and shuts down; 2) When a frequency can not assist propagation to a desired station or location. The brief transmission strains are shorter than 50 km, medium transmission lines range from 50 to 150 km and lengthy transmission traces are longer than a hundred and fifty km. Yagi: A directional antenna consisting of a dipole related to the receiver or transmitter and two further components, a barely longer reflector and a slightly shorter director. A receiver circuit consisting of a beat frequency oscillator and extra circuitry for enhanced reception of SSB alerts.

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