The component, structure and control software of an automatical call-up unit in radio call-up station are introduced to realize the automatic call in manual radio call-up station.

介绍了一种无线寻呼台自动传呼器的组成、结构和控制软件，利用此设备可以在人工寻呼台中简单，方便地实现自动传呼。

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A clearly worried Walters used his CB radio to transmit a mayday call, which was picked up by operators on the ground who then maintained contact with him throughout the flight.

Walters真的担心起来，他用无线电发了呼救信号，地面接线员接到信号并自此和他一直保持联系。

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If a special tag-reader is waved near the arm, a radio signal prompts the chip to transmit an identification number which is used to call up information about the wearer in a computer database.

当专用标记阅读器在手臂附近晃动，无线电信号就会激活微芯片传送识别码，从而调出电脑数据库中该客户信息。

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But this sad story should be a wake-up call for radio hosts around the world to follow the Roy D.

CNN: DJs broke 'Do No Harm' rule