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一、概述1960年美国《航空周刊》7月号报道了安装在 B—70和 F—108型飞机上的一种机载式声码器,为地对空提供可靠而保密的远距离通信。报道说该机传输速率2000b/s,自称清晰度单字为90%,句子99%,话音压缩比为6∶1,使用三级管250只,二级管915只,机器重60磅(27公斤),体积1.3立方呎。1972年,我军在抗美援越战争中,从被击落的美国战略轰炸机 B—52残骸中发现该飞机装有 ky—28保密机,并在机上找到有关保密机的资料。
I. Overview In 1960, the “Aviation Week” July reported on-board vocoders installed on the B-70 and F-108 aircraft to provide reliable and confidential long-range communications for Earth-to-sky. Reported that the aircraft transmission rate of 2000b / s, 90% self-proclaimed word, sentence 99%, voice compression ratio of 6: 1, the use of three 250 tubes, two tubes 915, the machine weighs 60 pounds (27 kg ), The volume of 1.3 cubic feet. In 1972, during the war to rescued the United States and aid China, the PLA troops found that the plane was equipped with a ky-28 security machine from the remains of the U.S. strategic bombers B-52 that was shot down and found information on the security machine on board.