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1990年11月22～23日由机电部主持在广州召开了七所研制的900MHz 无中心选址通信设计定型会。有38个单位、60多位同行专家参加了这次会议。七所在分析国外样机的基础上,自主开发了基地台、车载台、背挂台、遥控台、数传台等基本系列产品,经检测各项指标已达到1988年 TT2001标准(80个信道),干扰/抗干扰指标都达到了 CCIR 的要求。与国外同类产品相比,增加了振铃、回铃、忙音、来话号码显示、预置用户电话号码,改监听为同号插话及数传等新功能。形成了适合我国国情的900MHz 无中心选址通信系列产品。
November 1990 22-23 held by the Electrical and Mechanical Services Department held in Guangzhou in the seven developed 900MHz centerless site design communications will be. There are 38 units, more than 60 peer experts attended the meeting. Based on the analysis of foreign prototypes, Q7 independently developed the basic series of products such as base stations, vehicle-mounted units, back-up units, remote-control units and digital transmission units. The tested indicators have reached the TT2001 standard of 80 channels in 1988, Interference / anti-interference indicators have reached the CCIR requirements. Compared with similar foreign products, an increase of ringing, ringback, busy tone, incoming call number display, preset user phone number, change to listen to the same number of interlocution and data transfer and other new features. Formed a suitable 900MHz centerless location communications products for our country.