Coaxial Cable

Coaxial cable

Coaxial cable
Product description: coaxial cable is the cable that has two concentric conductors, and the conductor and shield share the same axis. The most common coaxial cable consists of a copper conductor isolated from an insulatin
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coaxial cable is the cable that has two concentric conductors, and the conductor and shield share the same axis. The most common coaxial cable consists of a copper conductor isolated from an insulating material. On the outside of the inner insulation is another layer of ring conductor and its insulator. The entire cable is then covered by a sheath of polyvinyl chloride or Teflon.

Coaxial cables can be divided into baseband coaxial cables and broadband coaxial cables (ie, network coaxial cables and video coaxial cables). Coaxial cable is divided into 50Ω baseband cable and 75Ω wideband cable. The baseband cable is divided into a thin coaxial cable and a thick coaxial cable. The baseband cable is only used for digital transmission and has a data rate of up to 10Mbps.

Coaxial cable structure

Coaxial cable parameter indicators:
Main electrical parameters
(1) Characteristic impedance of coaxial cable The average characteristic impedance of the coaxial cable is 50±2 Ω. The periodic variation of the impedance along a single coaxial cable is a sine wave with a center mean of ±3 Ω and a length of less than 2 meters.
(2) The attenuation of a coaxial cable generally refers to the attenuation value of a cable segment of 500 meters in length. When measured with a 10MHz sine wave, its value does not exceed 8.5db (17db/km); when measured with a 5MHz sine wave, its value does not exceed 6.0db (12db/km).
(3) The minimum propagation speed required for the propagation speed of the coaxial cable is 0.77C (C is the speed of light).
(4) The sum of the resistance of the center conductor of the coaxial cable of the coaxial cable and the resistance of the shield does not exceed 10 milliohms/meter (measured at 20 ° C).
Physical parameter
The coaxial cable is composed of a central conductor, a layer of insulating material, a mesh layer of a mesh fabric, and an outer layer of insulating material.
The coaxial cable is flexible enough to support a bend radius of 254 mm (10 inches). The center conductor is a solid core copper wire having a diameter of 2.17 mm ± 0.013 mm. The insulation material must meet the electrical parameters of the coaxial cable. The shield consists of a metal strip or sheet that meets the transmission impedance and ECM specifications. The shield has an inner diameter of 6.15 mm and an outer diameter of 8.28 mm. External insulation materials are generally selected from polyvinyl chloride (such as PVC) or similar materials.
coaxial cable Main parameters of the test
(1) Open circuit of conductor or shield.
(2) Short circuit between the conductor and the shield.
(3) Conductor grounding.
(4) Short circuit between the shielded joints.

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