Part 4

Classified in Other subjects

Written at on English with a size of 5.03 KB.

 
Distribution network in the receiving systems are terrestrial tv passive elements, composed of terminals for interconnecting the elements of the distribution and / or output connectors for the user. The bandwidth (frequency range) is the key parameter of the cast. There are two bandwidths: 47 to 862 MHz - TV and radio from 950 to 2150 MHz Terrestrial - TV and satellite radio is one of the most important parts of the installation of TV. The distribution of TV signals is done via coaxial cable from the head until the user takes. The elements that make up the grid are splitters Also called line dividers. It is used when only provides a connection and want to dispose of the signal in different ways. When an output not used should be closed with a resistance of 75U pass attenuation characteristics or insertion loss. It produces an attenuation of the signal values as they pass through it. It is stated in dB Rejection between outputs. It indicates how the output signals of a parasite affecting the rest of it (dB). The higher the value of higher quality to be the dealer. Adaptation of input-output (ROE). The resistor values should be 75 ÙResistive Types: They consist of a group of resistors properly calculated, to produce a balanced output signal. Inductive: Made from a slab of insulating material on which are mounted several copper toroidal coils, which causes less insertion loss and the elimination of any stray signals. Its use is recommended where the number of user takes more than 8 or 10. Derivatives are placed in a main distribution line to produce one or several ramifications of this. Do not bring stray signals, are usually made of 2 and 4 outputs, unused outputs should be closed with a resistance of 75 to pass attenuation characteristics (dB). Indicates the attenuation of the TV signal distribution network to pass through the diverter. The drifters constructed to be placed near the head have a higher missed derivacióion shunt attenuation (dB). Indicates the losses occurring in the shunt to remove part of the TV signal of the TV signal distribution network. The drifters with as many outlets have higher losses than those with bypass fewer outputs. Rejection between outputs (dB). Indicates how they affect other outputs signals mismatches parasites or existing one. The higher the value of rejection between outputs, higher quality will have the shunt. Types of Taps resistive shunts: They consist of a grouping of different resistance that produces a voltage drop necessary to produce attenuations of both bypass and insertion or step function where to place the shunt from the team physician. Rarely used today, only facilities that do not exceed the 10 drifters. Shunt Inductive:Built using high-frequency toroidal transformers. Presents less attenuation than the resistive shunts. They are the employees and the best results are obtained. Shunt Hybrid: They have stopped being used today. It was a mixture of the two. Tomas user Allows connection to the network of user computers to access the different services it provides. Filters separated by mixed signals from the TV bands, FI and FM and handed to two connectors. Separated where you can connect the TV or radio receiver. Dispersion Network: The network linking the distribution with the distribution network within the network user. They fall into two types: user takes step and end user takes shunt attenuation characteristics. DB indicates that lose in taking the TV signal (0 to 30dB) attenuation step. You must submit the lowest possible values between 0'4 and 0'8 dB rejection between takes user. Indicates the attenuation resistance in making the TV signal will suffer, not less than 30 dBUser Tomas step was installed on the internal network, considered derivatives, also called shots in series have two terminals, one, two or three output connectors. Terminals: They allow the passage of the signal to other elements of the chain same type. Connectors: These are the components to the user's view, these signals are the result of capturing a portion of the power of signal filtered and / or divided into one, two or three output connectors. Connector Configuration: Single connector TV / R Solo-R or TV connector TV / R-only connector TV-FI R-FI

Entradas relacionadas: