ICS 45 .020S 7 .1T B中 华 人 民 共 和 国 铁 道 行 业 标 准TB / T 2675- 2003450 MHz 同/异频单工列车无线调度 设备技术要求和试验方法 The specifications and test methods for 450 MHz same/different-frequency simplex train radio dispatching equipment2003-10-31 发布2004-04-01 实施中 华 少味民 共 和 国 铁 道 部发布TB / T 2675-2003目次前言 ·. Ul1范围 · 12规范性引用文件 ··，··。·····，··········，······· ·····，··· ······，······················，，······················，，··⋯ 13术语和定义 ···························································· ·········，········ ··· ···············⋯⋯14标准试验条件 ·····，····· ···························，·· ················· ··········，，···‘······ ··· ⋯⋯ ，.，⋯ 2 4.1 环境大气条件 ···········，······ ················· ······························· ，················⋯⋯ ，··⋯ 2 4.2标准试验信号 · 3 4.3标准日工作循环条件 ···········，··· ···················，·，·································，· ········⋯⋯ 4 4.4基本电源的标准条件 ····························· ·······························，······················⋯⋯ 4 4.5 标准设备端口负荷条件 ······· ··· · ·······，··············· ······，，··· ····，·········4··. . .⋯⋯5 4.6 标准静噪条件 ···················································· ································· ······⋯⋯ 5 4.7 音频带宽限制 ··················· ··，· ·····················，······ ·······，···· ··，，··· ··················，··⋯ 5 4.8 终止电压和有效电池寿命 ·····，·····‘··················，················ ······，·· ···· ····· ⋯⋯卜二65基本要求 ··· ······· ······· ························································ ················，············‘·⋯ 6 5 .1功能 ····，···········，·· ················· ···· · ···· ·· ·····⋯⋯，·· ·⋯⋯ ，-· ·‘二， ⋯ 6 5 .2一般要求 ·················，··································.
