They measure position, force or temperature and transmit the data instantaneously by radio.

它们测量位移、受力状况以及温度，并通过无线电即时的将数据传送出去。

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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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Created by SPAWAR System Center Pacific, the sea water antenna USES the magnetic induction properties of salt to make ordinary ocean water transmit and receive radio signals.

由海军空间和海上作战系统司令部太平洋系统中心制造的海水天线，利用盐的磁感应特性使普通的海水发射和接收无线电信号。

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ADS-B promises to make air traffic control easier, cheaper and in many ways safer by allowing planes to transmit their locations by radio frequency instead of depending on towers to use radar to track and coordinate them.

FORBES: Next-Gen Air Traffic Control Vulnerable To Hackers Spoofing Planes Out Of Thin Air

The concerns stem from the emissions of radio frequency (RF) radiation by both the handsets and the base stations that transmit and receive the signals.

BBC: Public Petitions Committee