Glossary a To F > 공지사항

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A connection between a two-way radio unit and the general public phone system. For power plants, substations, industrial plants, man and Other energy plants are used for reference to industrial, visitors and other signal gear. But for DTV, a robust meter studying is not any guarantee that you've discovered a very good reception spot if certain sorts of multi-path are current. The standard meter works well for analog stations. S-meter: A meter or bargraph that indicates the relative strength of a received sign. When a signal is 10 to 15 instances more highly effective than that of an adjoining channel station, most receivers change into unable to obtain the weaker station. A tuning methodology in transmitters and receivers which uses a few piezoelectric crystals to generate a variety of frequencies. A feature in certain receivers that may scan a frequency vary at certain increments (corresponding to 1 or 5 kHz) and pause on any frequency where a sign is present.

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. A false sign produced within the receivers circuitry. A FM radio sign robust sufficient to completely quiet the receiver background noise. The cable connecting a radio to an antenna. Blonder-Tongue, Wade, and others make antenna gear for the CATV/MATV market. Slang term for residence-constructed, noncommercial radio tools. The principle gadgets of gear used at a radio station. The last transmission by a station during a contact, low voltage power cable or the final amplifying stage of a radio transmitter. A system used in transmitter testing and adjustment that dissipates the transmitters power with out radiating it. The sideband increased in frequency than the transmitters provider. The sideband decrease in frequency than the transmitters carrier. LSB: Abbreviation for lower sideband. SSB: Abbreviation for single sideband. Hz: Abbreviation for kilohertz. Unit equal to 1,000,000 hertz or a thousand kilohertz.

MHz: Abbreviation for megaHertz (1,000,000 Hz). FSK: Abbreviation for frequency shift keying. Slow, gradual change in the frequency of a transmitter or receiver. APP - Application for new transmitter submitted. A modulation approach that varies the provider frequency of a transmitter in accordance with the variations within the strength of the modulating audio signal. The technique of altering the output service of a transmitter indirectly to be able to convey info. The passing of all needed information between two stations during a contact. The primary impact of the E-layer on radio propagation is to absorb vitality from indicators passing by it, though sporadic-E propagation makes attainable distant communications on frequencies above 30 MHz. Propagation of alerts on frequencies above 25 MHz via ionized trails left by meteors burning up in the ionosphere. A disturbed situation in the ionosphere attributable to launch of charged particles by the Sun which ends up in excessive absorption and poor radio propagation on most frequencies. A high pitched "whistle" sound caused by two carriers interfering with one another. The distance between the identical points on two consecutive radio waves.

An antenna that radiates, or receives finest, radio waves having their electric discipline parallel to the Earths floor. The output of a transmitter multiplied by the achieve of an antenna. Interpreting the document - The FCC defines "Effective Radiated Power" (ERP) because the actual transmitted power multiplied by the transmitting antenna’s gain (relative to isotropic, not in dB) in its best course. That's, the beam width is the number of levels between the points where the acquire is 3 dB lower than for the antenna’s strongest direction. LUF: Abbreviation for lowest usable frequency, the bottom frequency that can help propagation between two factors. The shortest path by radio between any two factors on Earth. Communication between two radio stations which can be in visible sight (even when telescopically) with each other. Common Tv antennas are capable of transmitting as well as receiving. An operator that activates a repeater station by transmitting on its input frequency with out talking. Slang for the collection of spare elements and miscellaneous gadgets kept by a radio operator or hobbyist. Slang for an incompetent, unskilled radio operator.