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A diplexer (sometimes called a combiner) is a device that combines the radio frequency output of two or more radio transmitters into a single output. This is extremely useful in reducing the number of radio antennas on a tower, reducing the weight and loading from wind and potential ice, as well as the necessary size of the tower itself. Diplexers must be carefully designed and tuned to prevent intermodulation and keep reflected power ( VSWR) to a minimum for each inputInformation processsing In information processing, input is the process of receiving information from an object. The word input is used as a noun (information received or the process of receiving it) and less often as a verb (to receive information; or to transmitter and frequencyFrequency is the measurement of the number of times that a repeated event occurs per unit time. To calculate the frequency, one fixes a time interval, counts the number of occurrences of the event within that interval, and then divides this count by the l. While diplexers can combine a relatively wide bandwidthAnalog Bandwidth is the width, usually measured in hertz, of a frequency band f f. It can also be used to describe a signal, in which case the meaning is the width of the smallest frequency band within which the signal can fit. It is usually notated B, W,, the major limitation comes with the antenna itself, which must be sufficiently widebandWideband in speech services means that the used speech frequency response covers 50-7000Hz. The opposite of wideband is narrowband. Other meaning could be broadband. to accept all of the signalA signal may refer to: an abstract element of information, or, more exactly, usually a flow of information (in either one or several dimensions). See Signal (information theory . in electronics) a signal is any physical phenomenon that can be modeled as as being passed through it, and transfer them to the airAir is a name for the mixture of gases present in the Earth's atmosphere. Compressed air is often used in scuba diving as a shallow water breathing gas and to inflate buoyancy devices. Compressed air is also used as a source of energy for pneumatic tools. efficiently.One of the most massive diplexers in use is atop the Empire State BuildingDavid's Day The Empire State Building a 102-story Art Deco building in New York City, was designed by Shreve, Lamb & Harmon Associates and built in 1930. Its history and statistics It is 390 m to the 102nd floor observatory; it is the tallest building in in New York, where over a dozen radio stations transmit through one four- panel antenna . Diplexers are also used to combine the audio and video carriers for television, and also for non- broadcast stations such as amateur radio.
Small diplexers are also used in the home, allowing direct broadcast satellite TV signals from the dish to the receiver to piggyback on one regular coaxial cable, along with lower-frequency signals from an outdoor terrestrial TV antenna for local channels. This is extremely useful in homes which are already pre-wired, as it eliminates the need for the difficult installation of unsightly extra cables. However, the cables must be the higher-quality RG6, as the less-expensive RG59 will not pass the high intermediate frequency (usually 950 to 1450MHz) which the LNB outputs from the feedhorn.
In this case, one diplexer joins the two signals together. Another diplexer then separates the signals to the receiver of the TV set, and the IRD of the DBS set-top box. More complex systems have a distribution amplifier, which allows each IRD to access multiple LNBs with different antenna polarizations. These usually have an antenna input and a diplexer, so that the antenna signal is also distributed along with the satellite.
See also: multiplexing
wireless communications
broadcast engineering
amateur radio
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