On the market, there are more kinds of RF coaxial lines, a variety of, users choose to worry about more points. Today, you'll learn about RF coaxial shopping, so you can find the right RF coaxial product for your needs.
1, observe the roundness of the insulation medium, the cross-section of the standard coaxial cable is very round, the cable external conductor, aluminum foil affixed to the outer surface of the insulating medium, the more round the outer surface of the medium, the smaller the gap between the aluminum foil and its appearance, the larger the gap is not round. Practice has proved that the smaller the gap cable performance is better, in addition, the large gap air is easy to invade the shield and affect the life of the cable.
2, to detect the consistency of coaxial cable insulation media, coaxial cable insulation media diameter fluctuations mainly affect the echo coefficient of the cable, this check can cut out a section of the cable insulation medium, with a micrometer to carefully check the outer diameter of each point, to see if it is consistent.
3, the detection of coaxial cable weaving network, coaxial cable weaving network cable shielding performance plays an important role, and in the power supply cable TV line there is a power back route, so coaxial cable quality testing must be whether the woven network is tight and flat to check, the method is to cut the coaxial cable outer sheath, cut a small piece of coaxial cable braiding net, the number of woven network identification, if consistent with the value of the indicators given as qualified, less than the indicator value is unqualified. In addition, a single braided mesh wire with spiral micrometer measurement, at the same price, the thicker the diameter of the better quality.
4, check the quality of aluminum foil, coaxial cable plays an important shielding role is aluminum foil, it plays an important role in preventing external open signal interference and cable TV signal leakage, so the new coaxial cable should check the quality of aluminum foil. Cut open the sheath layer to observe whether the surface of the braided mesh and aluminum foil layer maintains a good luster; Then take a section of cable, tightly wrapped around the small metal shaft, straightened to reverse around, repeated several times, and then cut open the cable sheath layer to see if the aluminum foil cracking phenomenon, can also cut out a small piece of aluminum foil in the hands repeatedly kneaded and stretched, after many kneading and stretching still not broken, with a certain degree of toughness for qualified, otherwise for the second product.
5, check the outer protective layer of the squeeze tightness, high-quality coaxial cable outer protective layer are tightly wrapped, so as to narrow the gap in the shield, prevent air into the cause of oxidation, prevent the relative sliding of the shield caused by electrical performance drift, but squeeze the package too tight will cause peeling off the protective layer, to force can not pull the core for the appropriate.
6, observe the shape of the cable into a circle, cable into a circle is not only a beautiful problem, but also a quality problem. Cables are rounded and flat, each cable remains on the same concentric plane, the cable and the cable in an arc parallel to the overall contact, can reduce the cable mutual force, stacking is not easy to deform damage, so in the acceptance of cable quality should not be taken lightly.
