1. Mechanical properties

The strength and elongation of pure copper conductors are greater than that of copper-clad aluminum conductors, which means that pure copper is better than copper-clad aluminum in mechanical properties. The copper-clad aluminum conductor is much lighter than pure copper, so the overall weight of the copper-clad aluminum cable is lighter than that of the pure copper conductor cable, which will bring convenience to the transportation of the cable and the construction of the cable. In addition, copper-clad aluminum is softer than pure copper, and cables produced with copper-clad aluminum conductors are better than pure copper cables in terms of flexibility.

2. Electrical performance

Because aluminum is less conductive than copper, the DC resistance of copper-clad aluminum conductors is greater than that of pure copper conductors. When the frequency exceeds 5MHz, the AC resistance attenuation at this time has no obvious difference under these two different conductors. At 5MHz, the current flows in a thickness of about 0.025mm near the surface, and the copper layer of the copper clad aluminum conductor is about twice as thick. For coaxial cables, because the transmitted signal is above 5MHz, the transmission effect of copper-clad aluminum conductors and pure copper conductors is the same. To a certain extent, it can be said that the return loss index of cables using copper-clad aluminum is better than that of cables using pure copper conductors.

3. Economical

Copper-clad aluminum conductors are more expensive than pure copper conductors of the same weight. But the copper-clad aluminum of the same weight is much longer than the pure copper conductor, and the cable is calculated by length. The same weight, copper-clad aluminum wire is 2.5 times the length of copper wire, and the price is only a few hundred yuan per ton. Taken together, copper clad aluminum is very advantageous. Because the copper-clad aluminum cable is relatively light, the transportation cost and installation cost of the cable will be reduced, which will bring certain convenience to the construction. .

4. Ease of maintenance

The use of copper-clad aluminum can reduce network failures and prevent network personnel from "cutting the core in the winter and cutting the skin in the summer" (aluminum strip or aluminum tube products) during maintenance. Due to the large difference in thermal expansion coefficient between the copper inner conductor and the aluminum outer conductor of the cable, in the hot summer, the aluminum outer conductor stretches greatly, and the copper inner conductor retracts relatively, which cannot fully contact the elastic contact piece in the F head seat; in severe cold In winter, the aluminum outer conductor shrinks greatly, causing the shielding layer to fall off. When the coaxial cable uses a copper-clad aluminum inner conductor, the difference in thermal expansion coefficient between it and the aluminum outer conductor is small. When the temperature changes, the fault of the cable core is greatly reduced, and the transmission quality of the network is improved.