What are the types of coaxial lines

According to the application position of coaxial cable, it can be roughly divided into 3 types.

1. Trunk cable: The thick cable whose insulation outer diameter is generally above 9mm, which requires low loss and low flexibility. Shanghai Satellite TV Installation Network

2. Branch cable: medium and thick cable whose insulation outer diameter is generally more than 7mm, which requires low loss and a certain degree of flexibility.

3. User distribution network cable: The insulation outer diameter is generally 5mm, and the loss requirement is not the main one, but it requires good flexibility and indoor uniformity and coordination.

 In the specific application, if the wiring length is too long and the signal attenuation is serious, it is a good idea to choose a thicker coaxial cable.

I always hear people say -7, -5 lines, do you know what it means? This also starts with the naming of the coaxial cable. In order to make it easier for everyone to roughly see the structure type from the model of the coaxial cable, the following is the unified model compilation method of our country's cable and the meaning of the code name for your reference. The naming of coaxial cables usually consists of 4 parts.

The first number after the national standard is the characteristic cathodic reactance. The characteristic cathodic reactance is determined by the structure and has nothing to do with the conductor resistance. It can be understood as the long-term impedance of the cable. The commonly used ones are 75Ω, 50Ω, and 93Ω.

The second number is the inner diameter of the outer metal. The larger the number, the thicker it is. In order to ensure a stable characteristic impedance, the inner conductor will also be thicker.

The third number is the serial number. The difference between the serial numbers depends on the manufacturer's instructions, and there is no uniform rule.

The above is the naming method of the national standard coaxial cable. Coaxial was first used in the military in the United States. The RG-59 (75Ω), RG-58 (50Ω) and RG-213 (50Ω) in the US military standard are commonly used by us. of.