[Same point]
1. The characteristic impedance is the same - 75 ohms;
2. The outer sheath, shielding layer structure, outer diameter of insulating layer, number selection, material selection, number of shielding layers, etc. are basically the same.
[Difference]
1. The physical properties of the insulating layer are different
2. Different core wire diameters
3. The above two fundamental differences determine the transmission characteristics of the two cables - different transmission attenuation
4. The obvious features of high-knitted cables are: the DC resistance of the shielding layer is small, and the low-frequency attenuation below 200KHz is reduced, which is beneficial to suppressing low-frequency interference. From the perspective of frequency distortion (high and low-frequency attenuation differences), high-knitted cables are rather serious. The direct effect of frequency distortion is the normal proportional distortion of various frequency components of the video signal, which directly affects the image distortion.
5. Copper-clad steel core wire: This is a kind of SYWV cable, which is used for radio frequency transmission above 46MHz for cable TV, and the low frequency attenuation of 0-200KHz is too large.
