1/2 leaky coax cable coupling model coaxial cables rg59 cable for cctv power 75 3 ohms impedance cmple digital coaxial cable f-type male rg6 coax digital audio 光纤cable规格|光纤cable哪里买|光纤cable价格|意思 淘宝海外 cmple digital coaxial cable f-type male rg6 coax digital audio