New Baofeng Wire and Cable: How to Detect Coaxial Cables
2020-10-28 16:03:12
The cross-section of a standard coaxial cable is very circular, and the outer conductor of the cable and aluminum are attached to the outer surface of the insulating medium. The outer surface of the medium becomes more rounded
New Baofeng Wire and Cable: How to detect coaxial cable
1. Check the smoothness of the insulating medium
The cross-section of standard coaxial cable is very round, and the outer conductor and aluminum of the cable are attached to the outer surface of the insulating medium. The rounder the outer surface of the medium, the smaller the gap between the aluminum foil and the shape, and the larger the gap. Practice has proven that the smaller the gap, the better the performance of the cable. In addition, air in large gaps can easily invade the shielding layer, affecting the service life of the cable.
2. Measure the consistency of the coaxial cable insulation medium
The fluctuation of the dielectric diameter at the edge of the coaxial cable affects the echo coefficient of the cable. This inspection can cut off the insulation medium of a section of the cable and carefully check the outer diameter of each point with a micrometer to determine whether it is consistent.
3. Measurement of coaxial cable braid
The textile network cable of the coaxial cable plays an important role in the shielding performance of the coaxial cable. It is still the power supply return line of the centralized power supply cable line. Therefore, the quality inspection of coaxial cables must be done by cutting off the outer sheath of the coaxial cable, cutting a small section of the coaxial cable braided network, and judging the number of braided cables to check whether the textile network is carefully smooth. If the value of the coaxial cable is consistent with the given index value, it is qualified. In addition, monofilaments were investigated using a spiral micrometer, and the thicker the wire diameter, the better the quality.
4. Check the quality of aluminum foil
Aluminum foil plays an important shielding role in coaxial cables and plays an important role in avoiding external open-circuit signal interference and cable TV signal confusion. Therefore, for new coaxial cables, the quality of the aluminum foil should be checked. First, open the sheath layer and observe whether the surface of the braided wire and aluminum foil layer maintains good gloss; second, take a section of cable, wrap it tightly around the metal shaft, straighten and wrap it in reverse, repeat several times, and then cut the cable sheath Layer the aluminum foil to see if there is any damage. Cut out a small piece of aluminum foil and knead and stretch it repeatedly with your hands. After many kneading and stretching, there is still no break. It must be a product with qualified toughness, otherwise it is Defective products.
5. Check the extrusion sealing of the outer protective layer
The outer protective layer of high-quality coaxial cables is tightly wrapped, which can reduce the gap between the shielding layers, avoid oxidation caused by air entry, and avoid relative sliding of the shielding layers, resulting in The electrical performance drifts, but the sealed packaging will cause inconvenience in stripping and increase the difficulty of construction. The inspection method is to take a 1-meter-long cable and clean the protective layer at the end, which is not suitable for the stress on the wire core.
6. Check the round shape of the cable
Cable loops are not only a beauty problem, but also a quality problem. The cable is circular, each cable is kept on the same concentric circle plane, and the cables are in parallel contact with each other, which can reduce the interaction force of the cables, and the stack is not easy to deform and break, so the quality of the accepted cable is It's impossible to be careful.
