Audio cable

Video cable, referred to as video cable, by the video cable and connector consists of two parts, of which: video cable is a coaxial shielded cable with a characteristic impedance of 75 Ω (ohm), common specifications according to the diameter of the wire is divided into two kinds of -3 and -5, according to the core line is divided into single-core and multi-core line two kinds of common specifications according to the cable end of the connector connected to the way there are Pressure connector and welding head two kinds, according to the equipment end of the connection method is divided into BNC (commonly known as card head), RCA (commonly known as lotus head) two kinds. Audio cable, referred to as audio cable, by the audio cable and connectors composed of two parts, of which: audio cable is generally a two-core shielded cable, connectors are common RCA, XLR, TRS JACKS

Video cable is an important part of the video system in the TV broadcast control room, the quality of the production directly affects the technical indicators of the video channel, the poor quality of the video cable may cause the signal anti-white, serious signal attenuation, equipment is not synchronized, and even signal interruption. In the video system in addition to a small number of control signal lines, program signals, synchronization signals, key signals and other signals are transmitted by the video line, and thus the video line problem is caused by one of the common sources of equipment and system failure. In the process of making video cables, first of all, it is necessary to select the correct video cable and connector. Selection of cables should first pay attention to its nominal impedance, there is a characteristic impedance of 50Ω cable in appearance and video cable is very close, do not confuse. In addition, attention should be paid to the cable or connector there is no oxidation, the cable or connector should be scrapped or processed as appropriate, otherwise, the oxide will cause solder joints soldering, resulting in serious signal attenuation, or even interruption. There are individual manufacturers in the market to cut corners, the production of video cable does not meet the specifications, such as: sparse shielding, wire diameter is not standardized, etc., when purchasing should also pay attention. In the choice of connectors as much as possible to meet the needs of the equipment, to avoid the use of conversion head, the specifications should be used in accordance with the specifications of the corresponding cable. Secondly, good crimping quality or welding quality must be ensured. The use of crimping type of joints, the cable of the various layers of wire diameter and crimping process requirements are very stringent, the surface of the production of a more economical, but a little inattention, it may be false, if often pull plug, the reliability of the lower, should try to avoid the use of this type of joints, have to use, it is best to crimp, and then add the weld a little bit, and at the same time in the pull, to avoid the cable on the cable with force. Relatively speaking, the welding type of connector on the process requirements are lower, but still need to pay attention to the specifications of the connector and cable specifications, welding requirements and welding the same requirements of ordinary electronic circuit boards, solder joints should be smooth, flat, no false welding. Finally, it must be checked for open or short circuits. Whenever a good video cable, no matter what connector, the length of how much, should use a multimeter to carry out a check to make sure that there is no open or short-circuit situation before it is completed.