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在我国通信网上采用3600路模拟传输系统的过程中发现,需要生产一种电缆衰减小的新型电缆,用于通过3公里以上的河流、湖泊。有发展前途的5400路和10800路模拟通信系统,以及高速数字传输系统(如 -1920),均需要采用这种新型电缆,因为在这些系统中目前的单元电缆段仅为3公里,甚至不到3公里。根据技术任务书要求,曾研制了四同轴和单同轴两种电缆,其衰减要比。KM-4型电缆小二分之一。对两种新型电缆的样品试验结果表明:四同轴电缆因其重量大(每公里
In China’s communications network using 3600 analog transmission system found that the need to produce a cable with a small attenuation of the new cable for more than 3 km through rivers and lakes. Promising 5400 and 10800 analog communications systems, as well as high-speed digital transmission systems such as the -1920, require the use of this new type of cable as the current unit cable segment in these systems is only 3 km or less 3 km. According to the technical requirements of the book, has developed four coaxial and single coaxial cable, the attenuation than. KM-4 cable smaller one-second. The sample test results of the two new types of cables show that the four coaxial cables have a large weight (per kilometer