Video cable television broadcasting room video system important constituent, production quality has a direct influence on the video channel of technical indicators, poor quality video line may cause signal anti-white, signal is severely attenuated, equipment is not synchronous, even the signal interrupt. In video systems in addition to a small amount of control signal line, a program signal, synchronous signal, keying signal signal is composed of video transmission and video line, occurrence problem is caused by equipment and system fault common fault of.

In the video production line process, first of all, must choose the right video cable and connector. Selection of cable should first pay attention to its nominal impedance, has a characteristic impedance of 50 ohm cable in appearance and video cable is very close, must not be confused with. In addition, attention should be paid to cable or connector has the oxidation conditions, the cable or connector shall be scrapped or inspect a circumstance to undertake handling, otherwise, oxide will cause the spot, causes the signal is severely attenuated, or even interrupt. Market individual manufacturer is Jerry, production of video lines do not meet the specifications, such as: shielding layer is sparse, wire diameter is not standard and so on, to buy time to pay attention to. In connecting the first choice as far as possible consistent with the equipment needed, avoiding the use of conversion, specifications according to the cable specifications correspond to use.

Secondly, we must guarantee the good quality of the crimping or welding quality. Using the crimping connector for cable way, each layer of wire diameter and a crimping process requirements are very strict, making up more trouble on the surface, but little attention, it may then empty, if often plug, reliability is lower, should try to avoid the use of this type of joint, may have to be used, the best after crimping, plus welding, at the same time in the plug, avoid the cable force. Relatively speaking, welded joint on the technological requirements on the lower, but still need to pay attention to Standard Specification for joints and cable specifications, welding requirements and general electronic circuit board requires the same spot, to smooth, flat, without cold solder joint.

Finally, we must check whether the open circuit or short circuit condition. When doing a video line, no matter what the joint number, length, should use a multimeter to check, identified no open circuit or short circuit condition, complete.