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Commonly Used Coaxial Cable Type And Characteristics

Sep 28, 2017

Coaxial cable is still the most widely used video transmission line in monitoring system. Coaxial video transmission technology, but also a monitoring system in a basic transmission. "Coaxial cable in the end can pass far" Coaxial video transmission technology, anti-jamming technology in the end now developed to what level? Depth understanding of the transmission characteristics of coaxial cable, master coaxial video transmission technology status and development of the monitoring system to improve the image quality, improve system design, effectively reduce system cost, is still a practical significance and positive significance.

Commonly used coaxial cable type and characteristics

Common coaxial cable type and performance:

1) SYV75-3,5,7,9 ..., 75 ohm, polyethylene insulated solid coaxial cable. In recent years it was called "video cable";

2) SYWV75-3,5,7,9 ... 75 ohm, physically foamed PE insulated coaxial cable. Some people call it "RF cable";

3) basic performance:

lSYV physical structure is 100% polyethylene insulation; SYWV is the foam rate of 70-80% of the physical foam polyethylene insulated cable;

Due to dielectric loss reasons, SYV solid cable attenuation was significantly greater than SYWV physical foam cable; in the commonly used engineering cable, the current physical foam cable is still the best transmission performance of the lowest cable, in the video, radio frequency, microwave all bands are Is such that. Manufacturers of test data given also illustrates this point;

Coaxial cable can be in the DC, RF, microwave band applications. According to the "radio frequency" / "video" to distinguish the cable, not only based on inadequate, but also prone to misleading: it seems that the video transmission must or can only choose a solid cable (choose large attenuation, high price); from the engineering point of view, According to "solid core" and "foam" cable to distinguish the type of more practical;

(128) and low (64) cable characteristics of the difference: eie laboratory experimental study shows that in the 200KHz frequency band, high-coding cable shield "low resistance" play a major role, so the low-frequency transmission attenuation is less than low cable The But in the 200-300KHz above the video, radio frequency, microwave band, due to "high frequency skin effect" played a major role, high cable has lost the "low resistance" advantage, so the high frequency attenuation of the two cables are basically the same