【 Weak current College 】 public broadcasting system transmission cable choice---Power By 【 China power house network 】

In the broadcasting system engineering construction process, people often focus on related equipment supporting it, rather than on broadcasting transmission cable choice. In fact, for a broadcast system engineering is concerned, to obtain satisfactory sound effects, but should be equipped with high-quality broadcast equipment (amplifiers, speakers, etc.), broadcasting transmission cable is good or bad, to some extent also affect sound quality.
At present, in a broadcast system engineering construction process, people tend to follow the family sound system using the "speaker" mode, to use broadcasting system transmission cables. In fact, it's a mistake.
Home audio systems used by the "speaker" to distinguish between positive and negative polarity and the transparent plastic coated with copper dyed gold silver second color in the market study Hong Kong crooner, commonly known as the "Silver line". "Silver line" of specifications are based on the number of copper wire inside the package to the number of the category as the number of "young", not the norm.
"Speaker Wire" key to home audio systems, typically use a length of only 3-5 m, so you should try to select the option for "rough", "material" better "speaker", to improve the signal transmission rate and lowering the transmission loss.
If you set the "speaker" for the public broadcasting system, the laying of lines long, engineering cost decided not may choose Advanced "speaker", can only use the lower grades of "speaker". But this kind of "speaker", a relatively poor quality, mostly from some small factories (workshop) use relative backwardness of the production process, the caller could not be assessed by reference to the national standards, acceptance.
Low grade of the "speaker" in general are parallel lines, that is, the transparent plastic wrapped two copper wire parallel arrangement. Electromagnetic theory tells us that any two Parallels exist between line parasitic capacitance and parasitic capacitance of line will cause transmission signals in high frequency components, the longer the line, the bypass line, the greater impact of parasitic capacitance. Therefore, long-distance transmission of broadcast signals, inappropriate choice of parallel lines, otherwise easily lead to the treble is not clear, stuffy, etc.
Scientists find twisted-pair mode can efficiently overcome line parasitic capacitance, and twisted-pair mode in the computer network lines, advanced audio wire has been widely adopted. With twisted-pair mode cable manufacturing process, an increasing number of transmission cable with twisted pairs. Therefore, the public broadcasting system DX radio signals also should use twisted pair cable broadcast.
Broadcasting in twisted-pair cable outer and package a plastic coat, on internal twisted pair can play a protective effect even further, you can avoid the construction project of trunking, cable tray cut, short-circuit internal core, this is the double-stranded sheathed cable broadcasting. Therefore, we recommend the public broadcasting system using double-stranded sheathed cable broadcasting.
Audio technology Super Forum in twisted-pair cable sheath broadcasting, there is also a side shield of double-stranded sheathed cable transmission. On large public broadcasting system, we recommend using shielding layer of wire transmission cable sheath. Because of the role of shielding braid, this cable can effectively prevent the broadcast cables on the same pipe (with Groove) laying of other cable of the effects of radiation, but also strengthen the resistance of the cable, Erichsen applies to the high-rise building weak current shaft internal wiring and installation of outdoor long distance.
In the public broadcasting system, broadcasting transmission cable in addition should use twisted pair, on its diameter is also a set of requirements. In theory, the more coarse wire diameter, line transmission loss less, but the resulting problem is that project cost, difficulty in construction. On balance, balance cost performance, broadcasting transmission cables can refer to the schedule.