| rad | measuring instrument in which the echo of a pulse of microwave radiation is used to detect and locate distant objects |
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| rad | an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m |
| rad | an electromagnetic wave frequency between audio and infrared |
| rad | radio telescope that uses interference patterns from two antennas instead of a parabolic antenna |
| rad | a two-way radio communication system (usually microwave) |
| rad | a radio broadcast of news |
| rad | static at radio wavelengths |
| rad | an observation made with a radio telescope |
| rad | someone who operates a radio transmitter |
| rad | an electromagnetic wave with a wavelength between 0.5 cm to 30,000 m |
| rad | an electronic receiver that detects and demodulates and amplifies transmitted signals |
| rad | astronomical telescope that picks up electromagnetic radiations in the radio-frequency range from extra-terrestrial sources |