What are the parametric indicators of coaxial cables?

I. What are the parametric indicators of coaxial cables that can be divided into? The main electrical parameters. (1) the characteristic impedance of coaxial cable coaxial cable average characteristic impedance of 50 ± 2 Ω, along a single coaxial cable impedance periodic change for sinusoidal wave, the central average value of ± 3 ω, the length of less than 2 m. (2) coaxial cable attenuation is generally referred to as the attenuation value of the 500-meter-long cable section. When measured with a 10mHz sine wave, the value does not exceed 8.5db (17db/km); when measured with a 5mHz sine wave, the value does not exceed 6.0db (12db/km). (3) The lower transmission speed required for coaxial cable transmission speed is 0.77C (C is the speed of light). (4) coaxial cable DC circuit resistance cable center conductor resistance and shielding layer resistance sum does not exceed 10m ohm / m (20 ℃ measurement). Physical parameters: coaxial cable by the center conductor . Insulation material layer. Mesh fabric and outer isolation material layer. The coaxial cable is flexible enough to support a bending radius of 254mm (10 inches). The center conductor is a solid copper wire with a diameter of 2.17mm ± 0.013mm. The insulation must meet the electrical parameters of the coaxial cable. The shield consists of a metal tape or sheet that meets transmission impedance and ECM specifications. The shield has an inner diameter of 6.15 mm and an outer diameter of 8.28 mm. polyvinyl chloride (e.g. PVC) or similar materials are usually used for external isolation materials. Main parameters: (1) Open circuit of conductor or shield. (2) Short circuit between conductor and shield. (3) Conductor grounding. (4) Short circuit between each shield connector.

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