Radio Terms And Abbreviations > 공지사항

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Propagation of signals above 30 MHz via bending and ducting alongside weather fronts in the bottom layer of the Earths environment, the troposphere. Propagation of signals above 30 MHz by way of refraction by extremely ionized areas around the Earths poles. UHF-T: The frequency range from 470 to 512 MHz. A plan to allocate completely different frequencies inside a range for particular functions and customers. A station making one-way transmissions for navigation, homing, and propagation indication purposes. A bunch of letters and numbers used to determine a station and the nation authorizing its operation. ASCII: Acronym for "American normal code for data interchange," a way of representing upper and lower letters in addition to numbers and particular symbols. The information in a packet specifying the meant receiving station. When two or more packet radio stations simultaneously attempt to transmit on the identical frequency. Term used to describe a profitable contact between two packet radio stations and alternate of packets between them. An agreed-upon frequency the place stations attempt to contact one another; once contact is made, stations move to a working frequency. Changes within the provider frequency of a Morse code transmitter, often resulting from power supply issues. The unmodulated provider frequency of a FM transmitter.

A receiver circuit that generates a replacement service to enable intelligible reception of CW, FSK, and SSB signals. A circuit to reduce the sensitivity of a receiver in mounted steps measured in decibels. A circuit that will increase the common degree of the modulating signal utilized to a transmitter. The constant output of a radio transmitter that may be periodically interrupted to ship messages by Morse code. A receiver circuit that adjust the amount of amplification given to a received signal in order that the quantity from the speaker stays comparatively fixed. A false or spurious sign in a receiver inadvertently produced by the receivers circuitry. A false signal produced within the receivers circuitry. Reception of a sign for a few seconds via meteor scatter. The amount of frequency space occupied by a radio sign. 1) When a station ends its operations and shuts down; 2) When a frequency can no longer support propagation to a desired station or location. Depending on the grounding scheme, the shields of a cable can be linked to the bottom at one end or each ends of the cable. A quick little bit of noise heard between the top of a radio transmission and the reactivation of the receivers squelch circuit.

A circuit that eliminates unwanted audio frequencies from the audio output of a receiver. The frequency vary that a receiver is at the moment tuning or that a filter permits to cross through it. A machine put in between a receiver or transmitter and the antenna to match the radio impedance to the antenna impedance for max power transfer. A gadget used with to match an unbalanced feedline, like coaxial cable, to a balanced antenna, like a dipole. An out of doors antenna, usually mounted on a rotor, that concentrates more transmitter energy (or receives higher) in a sure route. A modulation technique that varies the power output of a transmitter in accordance with the variations in the modulating audio signal. The unmodulated output of a radio transmitter. The frequency on which a radio transmission takes place, or the input and output frequency pair used by a repeater station. The particular person chargeable for all features and correct operation of a radio station. The individual at a broadcasting station responsible for correct and legal operation of a station and upkeep of all required information. Operation of a radio station with a human operator at the management level.

AGC: Abbreviation for automatic achieve management. ATU: Abbreviation for antenna tuning unit. Placing a loading coil at the middle of an antenna in order to decrease the antennas resonant frequency. Placing a loading coil at the bottom of an antenna with a view to decrease the antennas resonant frequency. A physically quick or small antenna with a high acquire preamplifier; designed to be used indoors or in restricted area areas. Generally, single conductor constructing wire in small sizes is solid wire, for the reason that wiring just isn't required to be very flexible. Some terminations on wiring devices designed just for copper wire would overheat underneath heavy present load and cause fires when used with aluminium conductors. Revised standards for wire materials and wiring devices (such because the CO/ALR "copper-aluminium-revised" designation) were developed to scale back these issues. Electrical wiring is an electrical installation of cabling and associated gadgets equivalent to switches, distribution boards, sockets, and mild fittings in a structure.