Unlike reading the meter, which is done by telephone, the control module technology gives commands by radio-frequency signals transmitted through the power lines.

Often, a steeple must be rebuilt with materials like fiberglass or certain woods that allow radio-frequency signals to pass through, Mr. Hormann said.

Humans are able to detect modulated radio-frequency electromagnetic signals in the microwave range, hearing them as sounds.

Next, a worker on the Argus Station at Jovian L-4 discovered a radio-frequency signal.

This is certainly the case for coaxial cables designed to carry radio-frequency signals (1-300 MHz).

A magnet sending radio-frequency signals is used to reset them to the proper rhythm without the need for surgery.

Several manufacturers are promising mice that use infrared signals (like a television remote control) or radio-frequency signals (like a garage door opener).

In an informal test, the unit's nondirectional radio-frequency signals penetrated floors and walls with no degradation.

RFID relies on radio-frequency signals to create a system that, for the first several years it was in use, was indeed uncrackable.

The radio-frequency signal that is transmitted from the ground is received by the command receiver and is amplified and demodulated.