Basic Knowledge Of Cable TV Coaxial Cable

What parts make up the coaxial cable? What are the main features? What is the characteristic impedance of coaxial cable related to? What is the attenuation constant of coaxial cable? What is it related to? What is the normal temperature coefficient? What is the minimum bending radius?

Coaxial cable consists of inner conductor, insulating medium, outer conductor and sheath (protective layer). The main properties are characteristic impedance, attenuation constant, temperature coefficient, loop resistance, shielding characteristics, and minimum bending radius. The characteristic impedance of the coaxial cable is related to the diameter of the outer conductor, the diameter of the inner conductor and the relative dielectric constant of the insulating medium. The attenuation constant of a coaxial cable refers to the number of decibels per unit length of cable attenuation of the RF signal. It is related to the structure size, dielectric constant and working frequency of the coaxial cable. The temperature coefficient is normally 0.2% (dB) / ℃. The minimum bending radius is 6-10 times the cable diameter.

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