专用频率 meaning in Chinese

dedicated frequency
discrete frequency

Here be shanghai amateur radio special use frequency , not break the law being put into use please
这里是上海业余无线电专用频率，请不要违法使用！
No radio station or other instrument and device used by a unit or an individual shall hinder the normal use of civil aviation special radio frequencies
任何单位或者个人使用的无线电台和其他仪器、装置，不得妨碍民用航空无线电专用频率的正常使用。
No organizations or individuals may use the same frequency or the same acoustic signals as those specially used by the state for civil air defense communications or air defense warning
国家用于人民防空通信的专用频率和防空警报音响信号，任何组织或者个人不得占用、混同。