寻求 ITU-R BS450-2 and ITU-R BS643-2

pozan1

  请教一下 这两文件需去那载,或可以提供 感激不尽!!

ITU-R BS450-2  Transmission standards for FM sound broadcasting at VHF


ITU-R BS643-2   System for automatic tuning and other applications in FM radio
                         receivers for use with the pilot-tone system