The standard of SYWV 75 series type of cable distribution systematic physical foamed PVC insulation coaxial cable sector wad fkrmulated in 1997 by the Electronics Ministry for producing physical foamed cable , the standard number:SJ/T11138-1997, our factory has also formulated its emterperprese standard following the above one.

A: Type: The names of different types of procucts are given in the light of some relativre regulations so as toreflect their main special characteristics.
Forinstance
B.Specifications:Following the GG11323-89 Regulations (cable distribution system-used coaxial cable shouldbe tested) and for meeting the development requirements of cable television as weii as implementing the sectors standard (SYKV longitudinsl hole olythene insulation caaxial cable), the insulation outer diameter should be 4.80mm, 9.00mm and 11.5mm separately.
C. Inner Conductor : Except for copper conductor for television cable production in foreign countries according to different line diameters and specifications . Therefore, in our production atandard , the copper-covered steel line inner conductor is added in -5, -7 cable and the copper-covered aluminumline inner conductor adder in -9, -12 cable so as to increase the products intensity and reduce cost at a prerepuisite of ensurinh quality.
D.Outer Conductor: The aluminum-magnesium alloy woven line is generally used in foreign countries .For saving copper materials and reducing cost , -5, -7, -9 cables is allowed to be woven with aluminum magnesium alloy line.
The aluminum tube is always used as outer conductor for bibsized cable in the countries of the United Statess and Japan etc. so to heighten properties of screening and fine moist-proof and mechanical protection.SO the aluminum tube outer conductor can be adopted for-9,-12 cables.
E.Insulation:The adopted physical foamed polythene has its fine hifrequency property and identity as well as fine moist-proof porperty.
F.Screening Attenuation:The property of cable screening can be reflected through screening attenuation index,which is one of the key tested indexes of CATV and it willensure the high quality reception of CATV system.